Subwoofer controller

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ataul

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Joined 2008
#1
I have build this circuit sub woofer controller but not work!! IC1 not work. at pin 7 on IC1 not work, it give -12volt on pin 7, what the problem?
Power supply is +/- 13to 14 volt unregulated IC TL072. please help?
 

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#2
Sounds like IC1b is slamming the negative rail. Check your work thoroughly, then substitute another dual op amp for IC1 to see if the problem persists.
If you haven't already, you should plan to use a regulated supply for the circuit.
 
#3
thanks for reply. I have use TL071,actually -12 volt coming from Pin1 on IC1a. and also cheeked another IC LM358 if i separate from IC1a part from IC1b then IC1b part is ok only flloting voltage is cuming from IC1B pin 7
 
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#4
I want to know this part of the circuit is correct? please verify.I am use TL072 instead of LM833.for the checking i have omit Vr1 and C2 82pf but no good result -12v coming from pin1
 

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#6

After 2 days investigation i can found an error look carefully IC1a here is marking pin no 2 is non inverting and pin no 3 is inverting input,actually it will be reversed.So as a symbol wise it is ok but pin no wise it is wrong and i made PCB as pin no wise and make positive feed back in IC1a.
 
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