Author Topic: Building log for "EEZ BB3 Enclosure & Bare Boards"  (Read 4318 times)

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Offline prasimix

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Building log for "EEZ BB3 Enclosure & Bare Boards"
« on: August 25, 2020, 08:32:58 am »


Quoted from here:

I will ask this here, several potentially interested people are already here ;)

Would there be any interest if i start somewhat of a "Build Log" in the projects forum?
This would explicitly be written from the perspective of a relative "noob" :p

My intentions for such a build log would be multiple, in no particular order:
- share my work with others doing the same, giving and hopefully receiving pointers
- Let the community help get my ass in motion :p

This could even work as a sanity check for your documentation ;)

EDIT: I should clarify: That would be for the "bare boards" kit, and would start with ordering (and maybe selecting and searching for) components, over soldering, assembly, calibration and finish, hopefully, with first uses.

More then 50 people backed "EEZ BB3 Enclosure & Bare Boards" kit so far! Therefore I'm opening a new topic where we can discuss assembly, problems, share building pictures and ideas but also possible improvements that could be added in new versions.

The starting point should be the Assembly instructions published here.

I am at your disposal and I will do my best to make the installation as painless as possible. Mouser should initiate pick up at any time now so kits can be expected in the coming days.
 
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Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #1 on: August 26, 2020, 12:40:08 pm »
I have a question about verifying that DCP405 works correctly. Some hints were already given here https://www.eevblog.com/forum/crowd-funded-projects/eez-bench-box-3-sequel-to-eez-h24005/msg3196838/#msg3196838 and here https://www.eevblog.com/forum/crowd-funded-projects/eez-bench-box-3-sequel-to-eez-h24005/msg3203298/#msg3203298

I wonder what is the minimum voltage that DCP405 accepts? Looks like for testing purposes it can be supplied from even less than 12V.
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #2 on: August 26, 2020, 12:51:57 pm »
I wonder what is the minimum voltage that DCP405 accepts? Looks like for testing purposes it can be supplied from even less than 12V.

Set by R13 / R16 it should be about +27 V (when EN input goes below +1.2 V).
 
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Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #3 on: August 26, 2020, 04:41:09 pm »
I guess this will help: I updated the content of the project pages on the web. I also put those documents in a newly created folder on GitHub where you can also find a PDF where all the documents are merged together.
 
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Offline Corona_Spark

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #4 on: August 28, 2020, 07:10:22 am »
The marked parameters of FB1 FB2 FB3 in the schematic diagram of DCP405 are 60R@100MHz, and the parameter in the BOM is 1k@100MHz.
In addition, the rated current of the inductor RN 112-4-02-0M7 is only 4A, which does not seem to meet the design requirements.
« Last Edit: August 28, 2020, 07:21:31 am by Corona_Spark »
 
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Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #5 on: August 28, 2020, 07:20:48 am »
Thanks, I'll change that is schematics since 1K were used.

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #6 on: August 29, 2020, 07:04:09 am »
Follow up on message #288 from another thread: I have 7 DCP405 modules left in the "junkyard". I can send them worldwide except at this time to Australia.

Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #7 on: September 06, 2020, 06:48:44 pm »
I powered one of dcp405 modules from a power supply. It seems aux voltages (+-9V +-5V) are fine, but on IC1 (prereg) I have RUN pin low. Is this normal? If so, I assume pre-reg is disabled by default and enabled by MCU. Is there any way to enable it for testing purposes?
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #8 on: September 06, 2020, 09:23:06 pm »
Sure, apply +5 V to IC1 RUN input (pin 8) to enable it. When enabled, you should get about +4 V on pre-regulator output (PREG_OUT+).

Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #9 on: September 07, 2020, 02:32:10 pm »
I applied +4V to RUN pin, and got +4.7V. Looks OK to me... I also removed the heatsink, looks like all ICs have correct orientation. IC9 has alignment issues, but looks to have a good electrical contact.

So, I guess, further troubleshooting requires installing it into the power supply? Or there is a simple way to output some test voltage? It seems I need to send some SPI commands to do so.

PS not sure if it matters, but both CV and CC LEDs are on.
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #10 on: September 07, 2020, 02:51:08 pm »
Yes, you need the rest of the system to continue with testing. Without control, both CV and CC will be turned on, that is fine.
 
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Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #11 on: September 16, 2020, 05:42:21 pm »
I tried to buy LRS-150F-48 from Mouser, but they don't ship it to individuals in EU. Is it possible to substitute it? If so, what would be suggestions?

I found HRP and HRPG series, which feature active PFC and slightly higher ripple, but have 38mm height instead of 30mm. Will they fit? (e.g., hrp-150-48).

Another question, can input be lower than 40V if I don't need full 40V output? I think I'll be happy with less than 30V of full-range output.
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #12 on: September 16, 2020, 06:18:14 pm »
Yes, the DC input could be lower, and max output voltage will drop respectively. I'm not sure if Mouser is a right address for buying Mean Well price wise, TME is much better, but with empty stock for F-version. The direct replacement is version with manual switch for AC input that shouldn't be a problem: you need to set it to 230 Vac and TME has over 100 pcs in stock.
The problem is that enclosure is custom tailored to accept LRS-150 modules. Thicker modules could be housed but ask for a new mounting frame and some extra tweaking.
 
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Offline The Soulman

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #13 on: September 16, 2020, 06:52:36 pm »
reichelt.nl has LRS-150F-48 for 24 euro incl. btw (tax).
 
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Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #14 on: October 18, 2020, 01:06:41 pm »
I started buying parts for aux ps, mcu board, and backplate and noticed that when using 1-click bom some parts din't make it into the basket (or I don't know how to use BOM). It seems that not all parts are available on Mouser, so I had to use digikey and tme. I suggest checking the following parts:

1. AUX PS heatsink
2. leds
3. idc ribbon cable
4. buzzer
5. banana socket

The hardest part to find turned out to be encoder, I'm going to replace it either with no-dent version, or 12 dents version. The next challenge was to find MCU. I found it only on digikey.

I put my orders already, hope to start assembly next week.
 
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Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #15 on: October 18, 2020, 01:41:10 pm »
Yes, there is a shortage of MCU, but the last time I checked (about 2-3 weeks ago) Farnell had most of the world’s reserves in stock :)
 
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Offline AkosL

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #16 on: October 18, 2020, 10:20:21 pm »
Guys, where did you find SRF0703-821M? Looks like it's nowhere even on Octopart.
Or is there a suitable replacement part?

For the MeanWell power supplies: look at local MeanWell distributor
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #17 on: October 18, 2020, 10:23:48 pm »
Same family, anything down to 330 uH should works.

Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #18 on: October 19, 2020, 07:49:52 am »
Oh boy, I'm bitten by the same problem again. Why mouser does this? :(. Worst part: I put all my orders already, so if I want to order this part elsewhere, I'll have to pay for delivery. I'm figuring out if I can provide them VAT of a company of a friend of mine.
 

Offline billrule

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #19 on: October 20, 2020, 12:25:33 pm »
I know this is basic, but apart from trial and error, is there a guide to which end of the case is the
front?
 

Offline AkosL

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #20 on: October 20, 2020, 03:41:37 pm »
Oh boy, I'm bitten by the same problem again. Why mouser does this? :(. Worst part: I put all my orders already, so if I want to order this part elsewhere, I'll have to pay for delivery. I'm figuring out if I can provide them VAT of a company of a friend of mine.

Did you manage to order it from Mouser? Local supplier is out of stock for that power supply, and got to the point when I have to give my credit card info at Mouser's checkout.
 

Offline Ranayna

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #21 on: October 20, 2020, 04:50:46 pm »
I know this is basic, but apart from trial and error, is there a guide to which end of the case is the
front?
Look at the holes. There are a lot more holes on the front side than on the back side, because both the MCU and the BP3C Board are mounted on the front side.
This is well visible in the assembly instructions of the 2Channel Kit:
https://www.envox.hr/eez/images/bb3_instr_bottom_plate.jpg
 
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Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #22 on: October 20, 2020, 08:55:36 pm »
Did you manage to order it from Mouser? Local supplier is out of stock for that power supply, and got to the point when I have to give my credit card info at Mouser's checkout.

No, they said it's only for companies. Had to order from digikey. So, I put two orders on digikey, they say I'll have to pay vat on delivery. Hope there won't be any hidden costs like processing (I'm in NL).
 
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Offline AkosL

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #23 on: October 21, 2020, 10:05:18 am »
@prasimix, I hope my last questions for now: do you have any alternative source for these?
PMB-1   PCB bracket; polyamide - hot glue?  ???
OSY5LU3E34X-3F1A   THT; LED 3mm; yellow - just solder in a 3mm led, and bend the legs? or does this have built-in current limiting maybe?

Thanks a lot!
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #24 on: October 21, 2020, 11:37:43 am »
@prasimix, I hope my last questions for now: do you have any alternative source for these?
PMB-1   PCB bracket; polyamide - hot glue?  ???

The same, from TME: PCB-MB-01

OSY5LU3E34X-3F1A   THT; LED 3mm; yellow - just solder in a 3mm led, and bend the legs? or does this have built-in current limiting maybe?

Huh, that one is a real trouble to source, but as you suggested any 3 mm LED with bended legs should be fine.
 
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Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #25 on: October 21, 2020, 12:32:45 pm »
Huh, that one is a real trouble to source, but as you suggested any 3 mm LED with bended legs should be fine.

I bought a green one, this one: https://www.tme.eu/en/details/osg8ha3e34x-3f1a/led-pcb-indicators/optosupply/ . I hope it will fit. The led is different, so current-limiting resistor might need an adjustment (or may be not, the specs seem to be the same). Or I find an orange led in a dumpster.
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #26 on: October 21, 2020, 12:54:34 pm »
Green is just fine. They are also partially used during AUX PS assembly for campaign fulfillment since yellow one was out of stock.
 
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Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #27 on: October 22, 2020, 07:38:10 pm »
I have a question about backplate BOM. I think X4, X5 and X6 should be the same (and they are in csv file), but they are different in this file: https://github.com/eez-open/modular-psu/blob/master/bp3c/BOM/EEZ%20DIB%20BP3C%20r3B3%20BOM.pdf . It also says that X4 should be right angled, but it looks like X5 is actually right-angled. Denis, can you please check? I guess, csv-file is more accurate? Or designating numbers are different on different versions of the pcb?

UP: my pcb doesn't match this picture: https://github.com/eez-open/modular-psu/blob/master/bp3c/Images/EEZ_DIB_BP-3C_PCB_top.png . For example, D4 on my pcb is named D5  on the picture. Should I use an older picture or something?
« Last Edit: October 22, 2020, 07:54:06 pm by exe »
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #28 on: October 22, 2020, 09:56:40 pm »
Yes, the BP3C that came with the campaign is r3B2 and is a little different from the version that went into release 1.01 in which r3B3 was released prematurely. Please use files from release 1.0 that contains r3B2 (see attachment).

Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #29 on: October 23, 2020, 05:55:27 pm »
Thanks, Denis. Do you remember what were the changes to the project after r3B2? Does it make sense to order new boards?
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #30 on: October 23, 2020, 06:41:09 pm »
Not at all in case of BP3C. I just removed one header and use Zener diodes in different package if I remember correctly. All other boards are different story since they needed some real changes to pass CE testings.

Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #31 on: October 23, 2020, 07:44:11 pm »
That's good, as I just finished the backplate :).

As I understand, CE is only needed for the aux supply board? The mcu board is not affected by this?

What's your advice: make new boards, or keep the ones in the kit?
 
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Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #32 on: October 23, 2020, 09:51:56 pm »
That's good, as I just finished the backplate :).

As I understand, CE is only needed for the aux supply board? The mcu board is not affected by this?

What's your advice: make new boards, or keep the ones in the kit?

I'm in process of learning what is behind CE marking. No, it is not needed just for AUX-PS module but for a complete solution that could include components that are already passed CE testing. But, surprise, surprise ... I’ve learned in a hard and very expensive way that it doesn’t really mean much: one Mean Well model can pass testing, combination of two different modules cannot (conducted emission break limit); one Mean Well model can pass testing, add another of the same type and they cannot pass testing (current harmonics break limit). Later issue required new AUX-PS, former probably will probably require giving up the LRS-150 model and using one who has a built-in PFC (If I’m lucky I’ll get away with a massive capacitor at the AC input, another option is next AUX-PS revision with PFC for up to three Mean Well modules which I have not yet begun to consider).

I learned that the MCU module cannot pass the radiated emission test when the antenna is horizontally polarized if the SDRAM is set as in the r2B4 version. It turns out it can pass if the SDRAM is set beneath the MCU.

Similarly, DCP and DCM modules broke the limit for radiated emission which also required some modifications (new pre-regulator in case of DCP, PCB redesign in case of DCM). I don't know what else awaits me on the way. The first next thing I have to pass is the current harmonics test. I am not even able to prepare because the documents of the norms that prescribe tests are not free, but literally cost a small fortune if I buy everything (it seems to me over 15,000 EUR).

My suggestion: assemble what you have, unless you want to wait uncertain period of time. At the moment, what I can say with certainty is that the design of the DCP module that passed the CE (r3B3) will not change, and for which I only currently have bare PCBs as well as an excess of assembled modules made by a new contractor.
 
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Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #33 on: October 24, 2020, 09:11:05 am »
Ah, silly me, I thought it's about safety. Thanks for detailed explanation, I'll proceed with current pcbs.
 

Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #34 on: October 24, 2020, 09:56:37 pm »
Denis, do I need to short any jumpers on any of pcbs?
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #35 on: October 25, 2020, 05:50:45 am »
No
 
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Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #36 on: October 25, 2020, 10:41:42 am »
Idiotic question, will aux ps work without OK1 optocoupler? Asking because mouser screwed my order and I now have two moc3062 instead of one moc3052 and one moc3062 :(. I'll order moc3052, but I'm impatient to test the board :). I guess without OK1 the current will go through the NTC1, but that's no problem for testing without load, right?
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #37 on: October 25, 2020, 10:52:21 am »
You can place MOC3062 on both positions. Better then you got two MOC3052.
 
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Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #38 on: October 27, 2020, 10:00:41 am »
Potential BOM issue: for MCU board, for "FB1, FB2" the quantity is specified as 1, while it needs two beads. I replaced it with BLM18HD102SN1 which is the only ferrite bead of this size I have. But because it has higher DC resistance (1.8Ohm) and lower current rating (50mA) I expect ethernet won't work properly (I don't need it anyway).
 
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Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #39 on: October 27, 2020, 12:06:13 pm »
Thanks, now it is fixed.

Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #40 on: October 27, 2020, 09:35:53 pm »
My friends, I assembled the mcu board, connected it to the aux-ps board, connected it to my computer, pressed boot0 button, switched on power and then.... nothing happened. Question: is DFU mode available on blank mcu by default, or it needs pre-existing firmware (i.e., the first time I need to flash the board via st-link interface)?
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #41 on: October 27, 2020, 10:31:43 pm »
Sorry to hear that.

No, you don't need anything to download firmware in the brand new (i.e. completely empty) MCU. Therefore, no need for STlink or external programmer. You even don't need to assemble a whole module just to establish communication for firmware download. It can be done with minimum parts: LDO (3.3 V power), Boot0 switch, MCU (i.e. everything from Sheet 2/5) and USB connector with R28, R29 in place.

Be sure that switch (which is very tiny) are really pushed on while power is applied.

For the beginning check if you have 3.3 V on MCU.
 
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Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #42 on: October 29, 2020, 08:15:58 am »
Thank you very much, I'll check on this.

Meanwhile I found that I didn't buy the ethernet port (LMJ30288115CNL) because it's not available from mouser.
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #43 on: October 29, 2020, 08:20:13 am »
Currently it is available only at TME, but there is a worrying info that Product available till the stock lasts. It seems that I have to replace it with something else in the next release!
 
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Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #44 on: October 29, 2020, 09:00:38 am »
I think there is an alternative ethernet port (the bom provides alternative sku) that is still on sale on tme.

Meanwhile I found the problem: I soldered the mcu the wrong way: it has multiple corner marks, two large ones and one small. I used one of big ones to orient the chip. What a bummer... I guess I should not do soldering late at night. I'll try to flip it, but chances are not great that it will work.
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #45 on: October 29, 2020, 09:02:36 am »
Ouch, that is exactly what happened to me with my first prototype ... and that was in the middle of the day.  :palm:
 
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Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #46 on: October 29, 2020, 10:38:57 am »
I think there is an alternative ethernet port (the bom provides alternative sku) that is still on sale on tme.

You're right the first choice is LMJTAB881243ML but also only available from TME.

Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #47 on: October 29, 2020, 10:41:26 am »
Phew, seems to be working after all :). At least I was able to upload firmware. I'd like to share my experience so other people won't do same mistakes.

Not the best soldering, but good-enough for Australia :). A few things I messed up. One is my zener flew away when I tried to grab it with twezers. I replaced ZD1 with two zeners (16V+7.5V). I think I damaged my tweezers by using them to open resistors on tape.

Then I couldn't solder the usb port, it seems it's meant to be soldered with hotair or reflow. I removed rear tab of the connector to get access to pins.
I ran out of cr2032 batteries, so I put cr2025, hope it will work.
The boot0 button seems damaged by flux: it's stiff, but seems to be working.

In some cases it might worth soldering ICs first, and then decoupling caps as they get in the way. But I mostly used hand soldering, users using hotair probably find it much easier to solder components. I put plastic parts at the very last because: 1) I was worried to damage it with hotair and flux 2) it's easier to work with flat board without components sticking from it. If I was assembling it again, I'd use solder paste and hotair gun for most components, rather than soldering iron.

Oh, and double-check the BOM :).

Now time to assemble the enclosure...
 
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Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #48 on: October 29, 2020, 10:59:13 am »
"Do not power on the MCU module without the display connected or with a loosely connected flexible display cable. Doing so may damage the power supply of the display backlight located on the MCU module." Oh shi~...
 

Offline Kleinstein

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #49 on: October 29, 2020, 11:08:26 am »
With the zener diode(s) in place there is a good chance the backlight drives does survive. It would be the zener that gets quite some heat. So having 2 may have helped ::).
 
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Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #50 on: October 29, 2020, 11:15:24 am »
"Do not power on the MCU module without the display connected or with a loosely connected flexible display cable. Doing so may damage the power supply of the display backlight located on the MCU module." Oh shi~...

Applicable only to assembled MCU modules where ZD1 with too high voltage (30 V) is mounted. In the last BOM list it is lowered to 24 V and it should be fine. If accidentally a failure occurs, there is no damage to the display. All that can happen is that D2 breaks.

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #51 on: October 29, 2020, 11:21:54 am »
Phew, seems to be working after all :). At least I was able to upload firmware. I'd like to share my experience so other people won't do same mistakes.

Not the best soldering, but good-enough for Australia :). A few things I messed up. One is my zener flew away when I tried to grab it with twezers. I replaced ZD1 with two zeners (16V+7.5V). I think I damaged my tweezers by using them to open resistors on tape.

Then I couldn't solder the usb port, it seems it's meant to be soldered with hotair or reflow. I removed rear tab of the connector to get access to pins.
I ran out of cr2032 batteries, so I put cr2025, hope it will work.
The boot0 button seems damaged by flux: it's stiff, but seems to be working.

In some cases it might worth soldering ICs first, and then decoupling caps as they get in the way. But I mostly used hand soldering, users using hotair probably find it much easier to solder components. I put plastic parts at the very last because: 1) I was worried to damage it with hotair and flux 2) it's easier to work with flat board without components sticking from it. If I was assembling it again, I'd use solder paste and hotair gun for most components, rather than soldering iron.

Oh, and double-check the BOM :).

Now time to assemble the enclosure...

Congratulations! The choice of method obviously depends on one’s soldering skill. I still manage to solder almost everything by hand. On this module I only used hot air for the LDO thermal pin. For USB you need a sharp tip.

There is one other thing that I did not mention in the building instructions and it is worth the effort is to further strengthen the SD card holder. Without that, it could easily happen that the metal shield pops out of the slot the first time you carelessly insert the card. Therefore, the metal shield should be soldered at three points as in the picture.



Attention! While this seems like a trivial task, it’s not for dilettantes like AssemTec Europe (aka Bolek & Lolek Enterprise). Namely, they managed to destroy over 30 holders that I had to replace. What's the problem? They applied too much solder that the solder spilled on the other side so the SD card could no longer be inserted!

Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #52 on: October 29, 2020, 12:14:03 pm »
There is one other thing that I did not mention in the building instructions and it is worth the effort is to further strengthen the SD card holder. Without that, it could easily happen that the metal shield pops out of the slot the first time you carelessly insert the card. Therefore, the metal shield should be soldered at three points as in the picture.

Very interesting, the sd card holder I bought have only one tab on metal shield. I have this one: https://www.molex.com/molex/products/part-detail/memory_card_socket/5033981892 (there is 3d view on the right). Anyway, I'll just be careful, that's the least problem I have :).

I did the first power up and... nothing happened except the fan worked for 10s or so. Is it possible to see any debug log via, say, usb? I wonder if it's "just" a display issue, or the board doesn't boot at all. I think this kit is a bit beyond my skills but I don't give up. I just need more spare parts :). I suspect the mcu can be partially destroyed due to previously incorrect orientation. I'll try to see if there is any signal on display pins with my oscilloscope and 10x probe.

PS I forgot to buy front push button, but I can 3d-print it.
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #53 on: October 29, 2020, 01:14:08 pm »
Very interesting, the sd card holder I bought have only one tab on metal shield. I have this one: https://www.molex.com/molex/products/part-detail/memory_card_socket/5033981892 (there is 3d view on the right). Anyway, I'll just be careful, that's the least problem I have :).

You have the right holder. It has only one tab, but it is possible to solder it on all three points.

I did the first power up and... nothing happened except the fan worked for 10s or so. Is it possible to see any debug log via, say, usb? I wonder if it's "just" a display issue, or the board doesn't boot at all. I think this kit is a bit beyond my skills but I don't give up. I just need more spare parts :). I suspect the mcu can be partially destroyed due to previously incorrect orientation. I'll try to see if there is any signal on display pins with my oscilloscope and 10x probe.

PS I forgot to buy front push button, but I can 3d-print it.

I'm confused now. I thought you changed the MCU because it would be a real miracle if it survived the wrong assembly. How you manage to download firmware if it cannot power up? Did you disconnect USB cable before power up? On the power up even if some errors are detected, with functional MCU you should hear the sound (OK, that presume that audio path is functional).


Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #54 on: October 29, 2020, 04:15:12 pm »
I'm confused now. I thought you changed the MCU because it would be a real miracle if it survived the wrong assembly. How you manage to download firmware if it cannot power up? Did you disconnect USB cable before power up? On the power up even if some errors are detected, with functional MCU you should hear the sound (OK, that presume that audio path is functional).

No, I just re-soldered the mcu. DFU works with it, but no sound, and tft brightness output is just 4.8V (I don't see pwm signal controlling brightness). Ordering new mcu...
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #55 on: October 29, 2020, 04:18:31 pm »
Yes, I think that is the right move. :-+
 
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Offline Kean

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #56 on: October 30, 2020, 09:32:52 am »
Attention! While this seems like a trivial task, it’s not for dilettantes like AssemTec Europe (aka Bolek & Lolek Enterprise). Namely, they managed to destroy over 30 holders that I had to replace. What's the problem? They applied too much solder that the solder spilled on the other side so the SD card could no longer be inserted!

Yes, one of mine seems to be suffering from this.  Getting the microSD card in was not easy, and getting it out again...  :palm:
I should have a suitable replacement part in stock.
 

Offline billrule

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #57 on: November 01, 2020, 04:58:02 am »
....wait....so you are implying we should read those wordy things BEFORE we ...O.... |O #$%$@!!
 

Offline Kean

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #58 on: November 01, 2020, 05:52:49 am »
....wait....so you are implying we should read those wordy things BEFORE we ...O.... |O #$%$@!!

OK, so what did you do?
 

Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #59 on: November 02, 2020, 08:43:04 pm »
I replaced the mcu with a new one, flashed firmware with "sudo dfu-util -a 0 -D ~/Downloads/bb3-v1.4.dfu", removed usb cable, power-cycled the board, and... nothing :(. I checked that 3.3V is present on decoupling caps, I saw a ~25MHz sine across Y1 oscillator (amplitude ~1V or thereabout), I checked that NRST pin is at 3.3V (measured on C8 capacitor footprint, no C8 is installed). No signal is present on Q2 (buzzer driver). I tried to start the board with and without screen, with and without backplate. I tried to replace the IDC cable too (just in case), no luck.

I suspect that there could be a soldering issue with RAM or something (for some reason solder doesn't wet pads well) and mcu stucks in initialization. I'll try to build a custom firmware that just beeps. And I'll try to resolder pins and I'll use more aggressive flux.
 

Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #60 on: November 02, 2020, 09:05:01 pm »
Oh boy, I added tons of flux and solder on SRAM chip, thoroughly resoldered it and...  it seems to be working! I wonder if the previous mcu worked too, but I'm not gonna recover it from the trash bin and resolder :).
 
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Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #61 on: November 03, 2020, 05:32:21 pm »
Okay, the "easy" part is done, now it's time for my lovely defective dcp405 modules. Denis, how do you test them?

I quickly checked them. Two of dcp405 seem to be half-working. At least they are detected and output something, but I see some weirdness in their behavior (such as voltage doesn't go to zero, or OVP triggers when trying to change voltage). One module doesn't recognize :horse: . I fixed one soldering joint on it, but it still doesn't recognize. I tried to initialize the module, but somehow I destroyed the sd card slot. No visible damage, it's just the card doesn't fit in. When I forced it in, it still not detected. Adding a new one to my next order...
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #62 on: November 03, 2020, 05:40:07 pm »
Okay, the "easy" part is done, now it's time for my lovely defective dcp405 modules. Denis, how do you test them?

I quickly checked them. Two of dcp405 seem to be half-working. At least they are detected and output something, but I see some weirdness in their behavior (such as voltage doesn't go to zero, or OVP triggers when trying to change voltage). One module doesn't recognize :horse: . I fixed one soldering joint on it, but it still doesn't recognize. I tried to initialize the module, but somehow I destroyed the sd card slot. No visible damage, it's just the card doesn't fit in. When I forced it in, it still not detected. Adding a new one to my next order...

Did you try to initialize it with MicroPython script as described in assembly instructions?

If OVP trips that is clear sign that CV control loop is not functional, i.e. cannot maintain set voltage.

Most of the junkyard boards are ready for complete resoldering or moving all parts section by section to the new PCB.

Also most of them should have properly functioning bias power supply (IC2, IC5, IC6) but still that is the first thing to check.
 
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Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #63 on: November 03, 2020, 09:22:23 pm »
Can I use an IDC cable to connect module outside the enclosure? Say, a 30cm cable, do you think it will work?

PS found why my sd card doesn't work. When I soldered front right corner the solder flowed inside and blocked the right side of cardhole :(.
« Last Edit: November 03, 2020, 09:42:53 pm by exe »
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #64 on: November 03, 2020, 09:41:48 pm »
We have to check that, currently there is an active discussion about that on #prototyping channel at Discord server :)

Offline Kleinstein

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #65 on: November 04, 2020, 10:39:39 am »
There is a good chance it can work with some 30 cm of cable. It is not ideal, but chances are not so bad. The critical signal would be the SPI clock and if there is significant ringing with the added line. It would help if the driver pin at the µC side is not set to highest speed, even if the means lowering the SPI speed a little.
 
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Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #66 on: November 04, 2020, 09:25:56 pm »
A quick update on my build:

1) soldered fan pin in reverse way. The interesting thing is the fan still worked, but readback didn't work and MCU thought the fan is faulty and was spinning it at full speed.
2) fixed the sdcard slot. Turned out card detect pins on the back were not soldered (I didn't notice them). The card holder got some cosmetic damage because I tried too hard to insert a card with a solder blob inside, but seems to be fully working. The blob inside was removed with a thin solder wick.
3) fixed all the dirty hacks I applied (put the proper optocoupler, replaced zener, replaced boot0 button, put proper FB1 ferite bead, installed ethernet socket, etc).

It seems that active discussions are happening on discord, so I think I should go there, and leave this thread only to report results.

PS I'll order a long ribbon cable to see if it just works.
 
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Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #67 on: November 07, 2020, 11:54:45 am »
Quick update on my build. I managed to fix two out of three dcp405 modules. One had soldering issue on shunt sensing opamp, another one had output enable resistor badly soldered (see the pic, although it was the other side of resistor, I wasn't able to take a good picture of the problem). In many cases visual inspection didn't help much, I had to probe with a dmm to detect failures. Soldering is actually quite bad, even though at first glance it doesn't appear so. I suspect they have problem with soldering paste, the alloy feels brittle or not completely melted or something. The board also produced cracking sounds when I dried the board with hotair (the temperature was well below 100C, I could keep my hand). I hope that weren't solder joints cracking...

My last dcp405 is a bit more difficult. I resoldered a few ICs with hot air, many joints resoldered with my leaded solder just in case, also found one disconnected capacitor (see the pic). The CC mode still misbehaves: it outputs 21uA when set to zero on low current range, and oscillating ~0.2mA on hight current range. Sometimes it outputs 22mA on that range when set to zero amps. I'll continue my investigation.

Meanwhile I found that common ground coupling didn't work. It was T2N7002AK,LM from toshiba which failed open between source and drain). My very-very first dead mosfet! I replaced it, and replacement died the same way... ESD problem? EMF from relay? I checked zenner across relay, it appeared to be working. I replaced the mosfet with 2N7002-7-F from diodes inc., and it worked. Weird, isn’t it?
 
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Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #68 on: November 07, 2020, 12:35:03 pm »
Small update, there is indeed a lot of oscillation on the last dcp405. Looking at broad noise spectrum I suspect pre-regulator is not functioning well.

PS I also checked my meanwell 48V supplies to be sure the noise doesn't come from them.

[attach=1]
 

Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #69 on: November 07, 2020, 01:34:25 pm »
Resoldered C13 capacitor (the one on the previous picture), and it seems the module works as expected, or there is an intermittent failure which disappeared.

So, now I have three modules, they work the same way. So, either they all fixed now, or they are all broken in a way I don't know yet. I've done stress test, all are capable of outputing 0.2V-40V, 50mA and 5A. Minimum current is ~22uA in 50mA range, I wonder if other users have the same.
 

Offline Kean

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #70 on: November 07, 2020, 02:09:27 pm »
So, now I have three modules, they work the same way. So, either they all fixed now, or they are all broken in a way I don't know yet. I've done stress test, all are capable of outputing 0.2V-40V, 50mA and 5A.
Sounds like good progress.  I've repaired 2 of my 3 so far.  Did you run the downprogramming test suggested by prasimix?
https://www.eevblog.com/forum/projects/eez-h25005-a-possible-successor-of-eez-h24005-programmable-power-supply/msg3303354/#msg3303354

Quote
Minimum current is ~22uA in 50mA range, I wonder if other users have the same.

Although the low range current display doesn't work in the 1.4 FW, you can still set low currents. I took some low current measurements (as suggested by a friend) via a 10k resistor and 20V compliance voltage.  Set at 100uA was reading about 97uA (3% low).  Set at 20uA was reading about 15uA.  Anything lower (including 0) delivered 10uA.  My low range calibration could possibly be a bit better, but I'm pretty happy.  Measured with my Keysight 34465A.
« Last Edit: November 07, 2020, 06:28:59 pm by Kean »
 
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Offline Kleinstein

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #71 on: November 07, 2020, 03:46:12 pm »
From the pre-regulator there can be some current for the control: there are about some 50 µA flowing through R7 and R10. Depending on the voltage some of this current bypassed the load, but not all. So the minimum current is expected to depend on the output voltage. With low voltage is may not go much below 50 µA, with more voltage ( > 0.5 V) the 50   µA should flow trough R27, R32 so that the load current could approach zero.
 
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Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #72 on: November 07, 2020, 08:32:52 pm »
With 10K resistor I too have ~10uA :). Indeed, as Kleinstein says, the min output current depends on output voltage. With 51k resistor I got ~3.43uA output current at ~0.18V drop. Cool!

One weird (or not) thing. I got really weird oscillations on output, something I can't explain. I connected my trusty (not anymore?) analog discovery 2 to see if downprogrammer works. The good news it does :). But what I also noticed is horrible ripple on output that didn't depend on power supply settings. The way I "fixed" it was... attaching ground wire to the module. I don't get how this works. What's worse, when I want to zoom in on ad2 and used 500mV sensitivity, I got channel overloaded (see last pic). Floating my laptop didn't help.

Omg, I got a ground loop that made my ad2 crazy. And the loop was due to... externally mains-powered sound card. Still, I don't get, how attaching protective earth connection to the power module helped. Shouldn't power modules be isolated?

PS attached a shot with DP on and off, jumping between 0V and 5V, current set to 1A, 10ms each step. With small current it was going into CC mode due to output cap :).

PPS I ran out of broken dcp405 modules, bought another one for repair.
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #73 on: November 07, 2020, 10:06:19 pm »
Still, I don't get, how attaching protective earth connection to the power module helped. Shouldn't power modules be isolated?

Power modules are isolated. PE could help because both Vout+ and Vout- have 10n to PE.
 
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Offline motozak

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #74 on: November 13, 2020, 04:21:04 am »
I am very interested with the EEZ DIB BB3 PSU, I want to build one but there is a problem with the MCU (STM32F769IIT6), this is very difficult to find in my area
can I replace it with another type like STM32F767IIT6 or STM32F767IGT6?
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #75 on: November 13, 2020, 08:16:20 am »
I'm aware of current shortage of selected MCU (only Farnell have it on stock). Using another MCU is possible in theory if pinout is the same (don't know), but even that one have to create new .ioc file and rebuild a whole firmware for it. If you are not skilled in programming, I would not recommend it.

I can also say that we do not plan to support any other MCU because we already have too much work to do to improve the firmware for the existing one.
 
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Offline exe

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #76 on: November 13, 2020, 08:59:32 am »
May be a solution could be to purchase an assembled mcu board separately (if they are available).
 

Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #77 on: November 13, 2020, 09:00:20 am »
... will be, I believe soon :)
 
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Offline knapik

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #78 on: November 21, 2020, 09:53:13 am »
Well, I didn't make an order from TME and had trouble finding the exact parts required for the ethernet jack. Thinking they were all identical, I found a replacement connector with a matching footprint and ended up spending a couple of days trying to figure out why 3.3V was shorted to ground |O

However, I found (if you're willing to live without the integrated LEDs) that a proper replacement can be found at Digikey with part number ARJ11B-MASAO-LU2. Weirdly enough, I can't find anything that that matches with the integrated LEDs apart from those 2 part numbers already mentioned in the BOM (and are available at TME only).
   
 
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Offline prasimix

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Re: Building log for "EEZ BB3 Enclosure & Bare Boards"
« Reply #79 on: November 21, 2020, 11:54:45 am »
Thanks for finding an alternative. LEDs are not really required as the patch cable goes to the rear panel also does not have LEDs. It seems that Mouser also offer it (but currently out of stock).
 
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