Recent Posts

1

Other Equipment & Products / Chipmaster 6000 Programmer LabTool 48 Dataman 48 48LV 48XP Teardown + a Request

« Last post by KG7AMV on Today at 04:46:33 pm »

I have Started the Teardown.  Blog Post on it https://www.stevenrhine.com/?p=133699

I Also Have the Firmware Backup Form U42 a W27C512 there as well incase anyone needs it.

My request is if anyone has any other variation of this programmer the Dataman XP and LV if able can you get me a copy of the U42 eprom thanks. 

Board Photos

Driver Unit Rev B1.0


Control Unit A3.0

2

Projects, Designs, and Technical Stuff / Re: (All-in-one DC-DC Buck converter) MPM3630 burns at startup. Layout error?

« Last post by RiZsho on Today at 04:46:07 pm »

Hi!

Voltage ringing on input destroying DC DC converters is nothing new and limited to this chip only. I know LT had an app not, but can't remember the title. The jist of it is the following: Long leads on input can have some inductance to them, so when you connect them to the input of the DC DC they tend to form a LC tank with the input caps (low esr helps ringing a lot in this case) and can cause massive spikes upon connecting. The app note tested three configurations: only ceramic, ceramic+electrolytic and finally ceramic+RC snubber in paralell (1uF||4.7Ohm). Basically keeping the ringing damped by increasing series resistance seen on empty caps. Almost all solutions helped a lot in some form or other ie. lowering the spike significantly.

Hope this helps

3

Test Equipment / Re: East Tester ET4410 Desktop LCR Meter

« Last post by w.v.s. on Today at 04:42:28 pm »

Is your computer prepared to display Chinese text? And would you mind logging its serial communication during the update?

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Projects, Designs, and Technical Stuff / Re: Using an IO expander to retain pin values in deep sleep

« Last post by Siwastaja on Today at 04:38:51 pm »

None of this makes any sense at all. You plan on playing around with many different dev/demo boards? I have bad news for you - most are not designed for low power at all.

Since you are implying that every microamp matters, there is no generic way to do that with every demo board in existence using the same code. What's wrong in device-specific? That's how everybody else does it.

Since this is a classic X-Y problem, now the question is, what are you actually doing?

5

Test Equipment / Re: East Tester ET4410 Desktop LCR Meter

« Last post by Martin72 on Today at 04:28:29 pm »

5. Then press the first button below the number with the 100ms.

This produces a message that I cannot interpret.

6

Thermal Imaging / Re: Infiray C210 Thermal Camera review

« Last post by duzycinek on Today at 04:26:50 pm »

I did some measurments. No good news. Voltages at start:
Main pcb:
Memory bat: 2.88v
Bat: 3.58v
L1: 3.18v
L2: 1.20v
L3: 1.36v
Sensor pcb:
3.3v: 3.23v
2.8v: 2.79v
1.8v: 1.88v

After 20 mins:
Main pcb:
Memory bat: 2.88v
Bat: 3.55v
L1: 3.20v
L2: 1.19v
L3: 1.36v
Sensor pcb:
3.3v: 3.23v
2.8v: 2.79v
1.8v: 1.88v

They are almost same. Only one voltage is changing, this one on flex.

7

Projects, Designs, and Technical Stuff / Re: Using an IO expander to retain pin values in deep sleep

« Last post by MrExpolre on Today at 04:20:55 pm »

Wow, thanks for the input all.

A search led me from one thing to the next and I think I might want to go with a PCF8574
I mainly work in micropython and using it seems pretty straightforward:
https://github.com/mcauser/micropython-pcf8574/tree/master
https://github.com/xreef/PCF8574_micropython_library

And yes, most (if not all) uc's have sleep modes where the output states are kept when sleeping but it requires specific code for each uc. Since I often switch when testing I'm looking for a solution that is not board specific. Completely planning ahead and selecting the right board for the job, let's say I tend to follow a different workflow.

Adding additional components does shift power consumption but in case of the PCF8574 it seems to only need 10 uA in standby.

Having pin state retention outside the uc would also give me the option to do a pre-emptive reset or do a reset on an unexpected error.

In short, it would seriously make things easier for me.

8

Projects, Designs, and Technical Stuff / OPA2182 double amp circuit Gain value question

« Last post by Overspeed on Today at 04:12:13 pm »

Hello

In the TI doc I have located this circuit base on two OPA2182 for a strain gage bridge

My question are  : this circuit with displayed value is G = 1+ (( 2xRf ) /Rg ) = 401 base on 10K and 50 Ohm resistor

1) What is the maximum gain ? I can use as I need 1000 or more ( 1500 ) . Does that will generate other problem as noise ? bandwidth ?

2) I suppose that the Rf resistor shall be matched ?

Thanks in advance

Regards
OS

9

Beginners / Re: Development of 500Vpp Linear Amplifier

« Last post by ejeffrey on Today at 04:11:23 pm »

Bootstrap. In thse circuits the opamp rides the HV rails. Scary but it does work.
www.edn.com/bootstrapping-your-op-amp-yields-wide-voltage-swings/
http://www.edn.com/contents/images/45890.pdf
You do need transistors thay can hande the full output swing though. P-ch 600V MOSFETs are avaialble.
Yes, that signal path video from the other day was great.

Bootstrapping won't work here because of the gain needed.  The amplifier needs to amplify 10 V to 250V so will have 240V from input to output.

10

Beginners / Re: RF voltage using oscilloscope????

« Last post by TimFox on Today at 04:10:09 pm »

High-power rated 50-ohm attenuators may be a bit expensive, but allow accurate measurement of high RF voltages across 50-ohm loads.
Often, such attenuators are directional:  the high power must be connected to one of the two connectors while the output (lower voltage) comes from the other.
MCL has a wide range of attenuators up to 100 W.
https://www.minicircuits.com/WebStore/Attenuators.html#product_detail_one
Bird makes them up to 4 kW input power
https://birdrf.com/Products/Test%20and%20Measurement/Attenuators.aspx