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Chipamp IC amp kits & PC boards from ChipAmp

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Old 30th March 2015, 03:40 AM   #1
thunderchicken is offline thunderchicken  United States
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Default Speaker Terminal Arcing

Yeah, that's not supposed to happen. Was looking for DC offset on my 2nd board- source connected but not playing. No load. I put the black probe on the black speaker terminal and the red probe on the red speaker terminal. Couldn't get a stable reading, which I thought was odd. I pulled the probes to change the scale on my DMM, and when I placed the black probe on the second time it arced. Now my DMM probe is black and pitted.

What went wrong and how can I fix it?
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Old 30th March 2015, 07:12 AM   #2
gmphadte is offline gmphadte  India
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The amp could be oscillating or you set the scale to Amps on your meter.

Gajanan Phadte
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Old 30th March 2015, 10:01 PM   #3
thunderchicken is offline thunderchicken  United States
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I think it's a ground (earth) issue, but I don't know what I should be looking for/fixing/replacing. Could the chip have a short? I know my transformer is (slightly- 28 vs 25) over the recommended range, but the first channel worked right away. I guess I have a different question now.

Is it worth connecting the tested power supply to the oscillating amp? That one step will tell me if it's the power supply causing the issue and it doesn't risk frying the good amp board. If the amp has the same issue with the good power supply, then it's definitely the amp. I think I just talked myself into it. Probably could have checked this last night.
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Old 31st March 2015, 12:39 AM   #4
thunderchicken is offline thunderchicken  United States
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The bad amp board is behaving the same on the verified/working PS. I didn't probe the speaker terminals again, but I hooked up my test speakers and got the same noises.
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Old 31st March 2015, 12:43 AM   #5
thunderchicken is offline thunderchicken  United States
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Measuring amps on my meter means changing the probe to a different socket, so it wasn't that.
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Old 31st March 2015, 01:26 AM   #6
rayma is offline rayma  United States
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Quote:
Originally Posted by thunderchicken View Post
Measuring amps on my meter means changing the probe to a different socket, so it wasn't that.
Use caution, this could even be AC line voltage. At any rate, don't connect your speakers until it's fixed.
Voltmeters don't normally cause arcing like that, whether DC or AC.

Last edited by rayma; 31st March 2015 at 01:32 AM.
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Old 31st March 2015, 01:40 AM   #7
thunderchicken is offline thunderchicken  United States
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Totally agree, I disconnected the faulty board, took reference photos, and posted them in my build thread. Also got in touch with chipamps.com. The other channel of this dual mono kit works fine. Still not sure what the issue is, hopefully I'll have some answers soon.
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Old 31st March 2015, 01:54 AM   #8
rayma is offline rayma  United States
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Quote:
Originally Posted by thunderchicken View Post
The other channel of this dual mono kit works fine.
Can you measure the power supply directly normally, without these symptoms, on the bad channel?
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Old 31st March 2015, 02:11 AM   #9
thunderchicken is offline thunderchicken  United States
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Which specifically? Am I checking between PG+ and V+ or am I probing V+ and V-?
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Old 31st March 2015, 02:13 AM   #10
rayma is offline rayma  United States
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Quote:
Originally Posted by thunderchicken View Post
Which specifically? Am I checking between PG+ and V+ or am I probing V+ and V-?
Try all the combinations, though none should spark.
Also, try borrowing another meter just to be sure.

Last edited by rayma; 31st March 2015 at 02:26 AM.
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