DC at outputs in TDA2009a chip amp

AltecDarpa · 12th March 2010, 04:26 PM

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?

http://www.electronickits.com/kit/co...ampl/ck708.pdf
there is the exact kit I have, showing the circuit.

Thanks for any help.

wahab · 12th March 2010, 05:33 PM

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..

AltecDarpa · 12th March 2010, 05:46 PM

Thanks, I hooked up a spare test speaker, and got a reading of .01mv at the outputs.

12th March 2010, 04:26 PM	#1
AltecDarpa diyAudio Member Join Date: Jun 2008	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? http://www.electronickits.com/kit/co...ampl/ck708.pdf there is the exact kit I have, showing the circuit. Thanks for any help.

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12th March 2010, 05:33 PM	#2
wahab 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..

12th March 2010, 05:46 PM	#3
AltecDarpa diyAudio Member Join Date: Jun 2008	Thanks, I hooked up a spare test speaker, and got a reading of .01mv at the outputs.