Forum: General Electronics Technical Discussion
Today, 05:44 PM
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Replies: 4
Views: 177
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Forum: General Computer & Tech Discussion
Today, 12:04 PM
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Replies: 2
Views: 43
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Forum: General Electronics Technical Discussion
Yesterday, 11:39 AM
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Replies: 7
Views: 140
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Forum: Troubleshooting Audio Equipment
01-11-2021, 07:47 PM
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Replies: 11
Views: 397
Re: Coustic AMP380
It seems to be repaired, operate it for a while and see if anything is getting abnormally hot. 1mv is should be ok,
I was thinking of other amps that usually have a higher value emitter resistor...
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Forum: Troubleshooting Audio Equipment
01-11-2021, 06:17 PM
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Replies: 11
Views: 397
Re: Coustic AMP380
It could be for adjusting the DC offset which would be 0 volts across the output, OR it could be to adjust the idle current which would be the voltage across one of the (0.1Ω)emitter resistors,...
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Forum: Troubleshooting TVs and Video Sources
01-10-2021, 07:27 PM
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Replies: 2
Views: 104
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Forum: Troubleshooting Audio Equipment
01-10-2021, 06:54 PM
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Replies: 11
Views: 397
Re: Coustic AMP380
Many times when one output (tip147) shorts, the excess current can damage the other one (tip142).
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Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals
01-07-2021, 04:51 PM
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Replies: 9
Views: 524
Re: Help to find out IC reference
This site has another picture https://www.modders-inc.com/gigabyte-gtx-980-g1-gaming-4gb-video-card-review/3/ with the same part (U4023) marked DU F4A3 so the last two characters are likely date...
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Forum: Troubleshooting Game Consoles & Other Weird Devices
01-03-2021, 11:12 AM
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Replies: 13
Views: 607
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Forum: Troubleshooting Computer Displays
01-02-2021, 09:37 PM
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Replies: 4
Views: 178
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Forum: Troubleshooting Computer Displays
01-02-2021, 06:39 PM
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Replies: 4
Views: 178
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Forum: Troubleshooting Audio Equipment
01-02-2021, 04:21 PM
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Replies: 11
Views: 397
Re: Coustic AMP380
How was the transistor shorted? if it was shorted C-B it is likely the driver transistor is also bad, Check all resistors and transistors in that circuit and compare to the working channel if needed....
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Forum: Troubleshooting Audio Equipment
01-01-2021, 08:16 PM
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Replies: 15
Views: 276
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Forum: Troubleshooting Audio Equipment
01-01-2021, 07:42 PM
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Replies: 11
Views: 397
Re: Coustic AMP380
The two pots are likley idle current for each channel's outputs but could also be dc offset
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Forum: General Computer & Tech Discussion
01-01-2021, 07:34 PM
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Replies: 74
Views: 1,868
Re: The 2021 Operating System Thread
I mostly use windows 7, I have a hard drive with windows 10 which I swap in once in a while just to update it, which it is doing now (kb4592438) downloading and installing for the last 2 hours.( its...
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Forum: Troubleshooting Power Supplies and Power Supply Design
01-01-2021, 07:07 PM
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Replies: 9
Views: 135
Re: How to test ac transformer secondary output?
Looks like the Blue wire is the center tap and the Red and Brown feed the diodes.
The Black feeds a diode for a negative voltage so it is likely that either Green or Purple goes to ground and the...
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