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Old 16th April 2014, 06:38 PM   #1
diyAudio Member
Join Date: Feb 2014
Thumbs up Amp6-basic - faulty channel

I screwed up somewherealong the way building my amp.

One channel works perfectly, but the other is very weak and only the high frequencies are coming through.

Any hints as to where i should look and what values i can measure on my board to find the faulty component or bad solder joint?
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Old 16th April 2014, 08:42 PM   #2
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Circuit/layout please?
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Old 16th April 2014, 08:46 PM   #3
tuo is offline tuo  Finland
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Location: Hansestadt Lübeck, Germany
Or pictures of the completed board... Many pairs of eyes can spot things much better than just one.
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Old 16th April 2014, 09:05 PM   #4
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Join Date: Feb 2014
Default Pictures of my board

Sorry, iPhone camera. quality not that great and the same can be said about my soldering...
Attached Images
File Type: jpg image.jpg (587.2 KB, 58 views)
File Type: jpg image[1].jpg (585.9 KB, 57 views)
File Type: jpg image[2].jpg (537.6 KB, 54 views)
File Type: jpeg image[3].jpeg (972.0 KB, 51 views)
Attached Files
File Type: pdf 396363-amp9-basic-amp6-sneeky-assembly-instructions-amp6_basic_1.20_schematic.pdf (26.3 KB, 13 views)
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Old 21st April 2014, 12:28 AM   #5
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Join Date: Nov 2009
Location: Sydney
Possibly the inductor, which is usually the prime suspect when only one channel is working, and looking at your pictures the one on the right looks to be a little lean.
Test the connection first by pressing on the inductor while playing to see if that makes a difference, then test connection between component and pad with a multimeter, and then go in with the iron and use flux, if you didn't use flux initually then that would be the reason that you don't connect the first time, which is actually easy because the inductors are big and suck a lot of heat and you bend up with a cold joint.
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