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Old 12th March 2010, 04:26 PM   #1
diyAudio Member
Join Date: Jun 2008
Default DC at outputs in TDA2009a chip amp

Hello, I purchased a TDA2009a 10+10 watt amp kit: QKits Electronic Kits: QK88, 10W Stereo Amp kit

And I assembled it, but when powered from a 12vdc adapter it gives 5vdc at the outputs, why would this be? there are no solder bridges, and all caps are oriented in the right way, would there be a problem with the dc decoupling caps on the outputs?

there is the exact kit I have, showing the circuit.

Thanks for any help.
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Old 12th March 2010, 05:33 PM   #2
wahab is offline wahab  Algeria
diyAudio Member
Join Date: Nov 2009
Location: algeria/france
Have you connected a load at the outputs?
A 10 to 20R resistor should do it for tests.
If there s no load, then you ll have to wait that
the output capacitor is charged through your
multimeter, and this is will take a considerable time
because of the high impedance of the latter, thus
you won t have the correct value displayed, which is 0V
once the output cap is charged..
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Old 12th March 2010, 05:46 PM   #3
diyAudio Member
Join Date: Jun 2008
Thanks, I hooked up a spare test speaker, and got a reading of .01mv at the outputs.
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