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Old 19th November 2012, 10:26 PM   #1
prezden is offline prezden  Canada
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Default TDA2030 Hum

I have just completed a 2030A kit from ebay. When I hooked it up to the power supply (2x9V) all I get is a hum. No music just a hum. I have tried connecting it in both series and parallel and to a different transformer with same result. I've looked carefully at the board but can't see any obvious problems.
Any advice would be greatly appreciated. I had planned on replacing all the caps systematically to do some listening tests as I go along. But now I'm not sure this thing is worth the cost of the new components.
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Old 19th November 2012, 11:22 PM   #2
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short the input. -> is the hum still there?
make sure to check all solder points again, reheat if You are uncertain. -> is the humm still there?

If the input is "floating" -i.e. not connected to anything- it acts like an antenna picking up junk only.
Mostly its not humm, but it CAN be.
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Old 19th November 2012, 11:29 PM   #3
Jay is offline Jay  Indonesia
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Start wiring properly. Shielded cable for input signal etc.
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Old 20th November 2012, 12:52 AM   #4
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what the hell has happened to the third from left green electrolytic?
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Old 20th November 2012, 01:41 AM   #5
prezden is offline prezden  Canada
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That one was damaged when the package came from China. This kit was supposed to have Chemicon and Panasonic capacitors but all it had was cheep Chinese crap. I had planned on replacing the caps when I get it up and running.
I just tried running it with a 12v wall wart - no hum but no sound either. This evening I am going re re-wire the inputs with some proper wire.
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Old 20th November 2012, 04:44 AM   #6
prezden is offline prezden  Canada
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Thanks for all your suggestions-
I rewired the power mains and input wires. Also checked all the soldering and touched up a couple spots. Still no music - just hum
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Old 20th November 2012, 10:05 AM   #7
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change that cap then
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Old 20th November 2012, 04:19 PM   #8
Minion is offline Minion  Canada
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well , it looks like there might be a resistor missing and you don't have the dual potentiometer connected , without the pot connected it wont pass signal ......
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Old 20th November 2012, 04:53 PM   #9
prezden is offline prezden  Canada
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The missing resistor is now supposed to be used in the OCL circuit. I was wondering about the pot. I didn't want to use the on board one so haven't wired up the one I will be using. I was hoping to get the problem of the hum resolved first.
Could the damaged cap cause the hum?
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Old 20th November 2012, 04:59 PM   #10
Minion is offline Minion  Canada
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without the pot the input signal is left floating and unconnected which will cause it to hum ....... connect the pot and the hum should go away , if you don't want to use a pot short the second and third pins together on each row ......
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