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Old 14th September 2012, 11:38 PM   #1
diyAudio Member
Join Date: Nov 2009
Location: Lincolnshire UK
Default TDA3122 test amp.

Hi all, got some free TPA3122 chips to play with. I've copied my layout for stripboard onto paper and am sorting all bits out that I need.

Now I have a 2 x 12v torroid which I hope to use, as its AC I will need to use a rectifier to connect the amp. I have a rectifier board and parts from a LM4780 audiosector kit. Would this be any good for what I'm planning or will I have to use something else.

Sorry for noob question, but 4780 is only kit I've built. Now I'm hooked and want to learn more.

***EDIT*** See messed up already its TPA3122.. got 4 of em so i can blow 3 in an attempt for a stereo or 2 for bridged

Last edited by littlerick; 14th September 2012 at 11:41 PM.
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Old 15th September 2012, 03:25 PM   #2
diyAudio Member
Join Date: Nov 2009
Location: Lincolnshire UK
Anybody help? Sat with my soldering iron poised for action for 12 hrs now he he!
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Old 16th September 2012, 09:23 AM   #3
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Join Date: Nov 2009
Location: Lincolnshire UK
I have made a rectifier using 8 1n4001 diodes with 100uf smoothing caps. Using a 2 x 12v transformer which is putting out 12.3v on each output. running it through rectifier i'm getting 20.1 v dc output.

hoping to build amp boards during the week, still trying to translate schematic to stripboard and getting stuff into place. Not blown myself up or had a flash of not working, so going good upto now.
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Old 16th September 2012, 12:00 PM   #4
Pafi is offline Pafi  Hungary
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Join Date: May 2004
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100 uF is too small, I recommend 2200 uF at least.
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Old 16th September 2012, 12:27 PM   #5
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Location: Lincolnshire UK
ok will that change my output value or just smooth the ac better?
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