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Topic: Identify capacitor value (Read 93 times) previous topic - next topic

gsmithzoo

Feb 23, 2021, 11:49 pm Last Edit: Feb 23, 2021, 11:52 pm by gsmithzoo
Dear,

could be possible to identify or at least guess the capacitor value of the c1 or c2 in the image below?

Thanks in advance


DrAzzy

#1
Feb 24, 2021, 12:01 am Last Edit: Feb 24, 2021, 12:04 am by DrAzzy
Remove from PCB and measure it. You can get cheapie component measuring things on aliexpress/ebay/etc. They ain't lab grade but they're good enough for like 0.1uF

The brown ones are tens of nF or larger, the white ones are low.

Unless it's fairly new, I'd be surprised if they were larger than 1uF. I'd wager 0.1 ~ 1uF.

Why do you ask?
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larryd

#2
Feb 24, 2021, 12:06 am Last Edit: Feb 24, 2021, 12:07 am by larryd
I'll bite, are they 100nF ?




C1 looks like it's between VDD and GND






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groundFungus

#3
Feb 24, 2021, 12:48 am Last Edit: Feb 24, 2021, 12:51 am by groundFungus
0.1uF bypass caps is my guess, too.

Paul__B

OK, C1 is a supply bypass, so 100 nF sounds plausible.  C2 is connected only to the COB chip, so its value is entirely indecipherable as is C4.  C3 (absent) is likely part of the clock oscillator.  The "VPP" and "RST" markings refer to the test pads and have nothing whatsoever to do with the capacitors.

But why the "XY problem"?

TomGeorge

#5
Feb 24, 2021, 12:49 pm Last Edit: Feb 24, 2021, 12:50 pm by TomGeorge
Hi,
Welcome to the forum.
What are they in?
Do you think they have failed?

Can you please give us more .. more.. more.. info about the assembly?

Thanks.. Tom... :)
Everything runs on smoke, let the smoke out, it stops running....

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