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September 19, 2021, 09:27:52 09:27


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Author Topic: finding short on motherboards using a shorty with display  (Read 6502 times)
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PM3295
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« Reply #50 on: June 27, 2021, 04:38:13 16:38 »

I received the pcb, tried the new current source and it never worked dur to these oscillations.
At least we know now that the issue is caused by using the new CS.  Smiley maybe?
« Last Edit: June 27, 2021, 06:07:13 18:07 by PM3295 » Logged
kripton2035
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« Reply #51 on: June 27, 2021, 05:51:21 17:51 »

next thing I will try is to resoldier the original current source, and see if these oscillations are still here. it's not a big work to do. they are very similar.
then I will try to capture these oscillations if still there.
the original "current source" is not one in fact. each time you power off-on the device, there are small changes in the voltage supply
and the displayed value is not the same. I find it annoying, and tried to have a more stable current source for that purpose.
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kreutz
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« Reply #52 on: August 07, 2021, 05:28:59 17:28 »

What about keeping the original circuit and stabilizing the voltage? What is important is to treat the circuit as a "short finder" and not as a "precision micro/milli -ohm meter".
« Last Edit: August 07, 2021, 05:32:18 17:32 by kreutz » Logged
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