email(at)jaredyates.com
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 Posted: Wed Jun 15, 2011 3:43 pm Post subject: AEC 9009 Audio Amplifier Troubleshooting Questions |
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I just got to the point where I can test my home-made audio amplifier, but it isn't working yet, and I was hoping I might be able to get some help from those who have built the circuit before to help narrow down the troubleshooting. I wired it up, applied power, and it blew the 1A fuse. I looked everything over to be sure that I didn't have any obvious shorts and couldn't find any. Just to be sure that the rest of the wiring wasn't the problem, I removed all of the wires except for the power and ground, but it still blows the fuse. I went through each component and verified the placement of the ICs and resistors. I did notice that I had one capacitor backwards, number 127, 1uF capacitor. I reversed it but still didn't notice any difference. Is there an easy way to test a capacitor to see if it is still good? There isn't any physical damage to any of them.
I replaced the fuse with my multimeter leads to try and measure how much current it was taking, but the meter read zero, so I turned off the switch after a second or so. After that test the 317 was warm, but not hot, and nothing seemed to be smoking.
Here are some pictures of the board:
http://jaredyates.com/temp/aec9009/P1010764.JPG
http://jaredyates.com/temp/aec9009/P1010765.JPG
http://jaredyates.com/temp/aec9009/P1010766.JPG
http://jaredyates.com/temp/aec9009/P1010767.JPG
I had to make some substitutions in the capacitor part numbers due to digikey stock changes, but the resistors and ICs are all per specs.
Does anyone have any suggestions on what to check next?
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