Author Topic: EEZ Bench Box 3 - Sequel to EEZ H24005  (Read 25711 times)

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Offline ResistorRob

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Re: EEZ Bench Box 3 - Sequel to EEZ H24005
« Reply #225 on: June 11, 2020, 12:56:49 am »
Accepting new orders for this?
 

Offline prasimix

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Re: EEZ Bench Box 3 - Sequel to EEZ H24005
« Reply #226 on: June 11, 2020, 06:05:07 am »
Accepting new orders for this?

Yes, visit https://www.crowdsupply.com/envox/eez-bb3.

Crowd Supply has already ordered a number of units over those that go for the fulfillment of the campaign, so there will be no need to wait any further for delivery. Unlike the H24005 project, the plan with BB3 is to establish production and availability for many years to come. Over time, we plan to add new modules and improved versions of existing ones.
« Last Edit: June 11, 2020, 10:25:47 am by prasimix »
 
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Offline prasimix

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Re: EEZ Bench Box 3 - Sequel to EEZ H24005
« Reply #227 on: June 12, 2020, 03:54:23 pm »
I'd love to see 2Q and 4Q modules become available, for instance. Don't break that by spending extra to work around one problem now. Focus on a healthy BB3 ecosystem for the long term!

I have been dreaming of a 2Q/4Q solution since the beginning of the H24005 project. However, it does not seem to happen so soon. It has now been more than a year since I was promised a schematic of a highly completed concept that could be used for the first prototype. That unfortunately didn’t happen and I don’t know if it will happen at all. A lot of knowledge and experience is needed for a good 2Q (or 4Q), far beyond my capabilities. Then it is not surprising that there are no such DIY and open source 2Q/4Q. You can easily find a schematic with the LT1970 with an output booster that probably works correctly for simple tasks. I’m not sure how precise its current setting is, how it behaves with the capacitive load and what its transition is between CV and CC mode.
The matter is further complicated if you want to have the setting and reading of the output values ​​over a wide range, which usually means more ranges and thus autoranging. The latter is in itself complex enough for a unipolar, let alone a bipolar power rail.

I will continue to believe that it is possible to make an open source 2Q/4Q solution and I am ready to invest both time and effort to make it happen, especially since we already have very solid and attractive software support for 1Q and I think it can be easily expanded to achieve SMU functionality. I offered to several people to cover their basic development costs as well offered them revenue share. However, it seems that I still have a "chicken and egg" problem because I'm a nobody and real experts, I believe, would rather get involved if it was a well-established business and a well-known brand when reward is much more tangible. 2Q/4Q seems to belong to purely professional domain and there is a huge gap between that world and what is being discussed on this and similar forums. In the end, this should come as no surprise as anyone with a full-time job in power electronics certainly can’t speak openly because the NDA doesn’t allow it.

Going back to the very beginning of this thread it can be seen that SMU was mentioned and not just any one but Keithley 2400! I do believe it is possible to make something between that and the “proof of concept” LT1970 4Q which would be welcome on many benchtops.
 
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Offline prasimix

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BB3 fulfillment, week #23 update
« Reply #228 on: June 16, 2020, 10:08:20 am »
I got yesterday a short update with video how DCP405 modules come out of the reflow oven. It's available on Twitter: https://twitter.com/envox/status/1272448101815648258
 
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Offline prasimix

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BB3 fulfillment, week #24 update
« Reply #229 on: June 23, 2020, 05:29:37 pm »
 This week update: |O |O |O :bullshit: :palm:
 
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Offline AlanS

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Re: BB3 fulfillment, week #24 update
« Reply #230 on: June 24, 2020, 12:15:06 am »
This week update: |O |O |O :bullshit: :palm:
I gather you're hearing the "Sound of Silence"? :horse:
 

Offline prasimix

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Re: EEZ Bench Box 3 - Sequel to EEZ H24005
« Reply #231 on: June 24, 2020, 05:27:03 am »
No music ...  no sound ... only a massive dose of silence occasionally interrupted by false promises, and misinformation.
 
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Offline prasimix

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BB3 fulfillment, week #25 update
« Reply #232 on: June 30, 2020, 01:37:02 pm »
Yesterday I got tracking number of the first batch of DCP405 modules! They should arrive by the end of this week. Sending a new, bigger batch has been announced for this Friday. I was told that the finalization takes so long because the assembly of the THT components is slow.  :-//
 
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Offline Kean

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Re: EEZ Bench Box 3 - Sequel to EEZ H24005
« Reply #233 on: June 30, 2020, 02:28:18 pm »
Well hand placed THT is very labour intensive, and I suspect many companies are still short on labour due to COVID.  You wouldn't try to automate THT placement for a small run like this.

Thanks for the update!  I'm not worried too much about the delays.  I'm actually embarrased to admit that I still haven't assembled my pair of EEZ H24005's.  I must try do that before the BB3 arrives...
 
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Online knapik

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Re: EEZ Bench Box 3 - Sequel to EEZ H24005
« Reply #234 on: July 01, 2020, 01:58:34 pm »
Have you done much testing for how much power the SK96-84-SA heatsink can dissipate with the fan on? I think a small electronic load module could be a neat idea, but knowing the thermal limits before brainstorming would be handy.
 

Offline prasimix

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Re: EEZ Bench Box 3 - Sequel to EEZ H24005
« Reply #235 on: July 01, 2020, 02:26:25 pm »
With fan running it should dissipate 20 W continuously. I like more 2Q DC source then electronic load. DCP405 is already 1Q+ since has down-programmer. To make it 2Q down-programmer power stage should be enforced, and current setting and monitoring need to become bipolar. But, ok, making an electronic load with bigger heatsink to handle e.g. 30 W or more is still a valid idea.
 
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