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?
Power supply is +/- 13to 14 volt unregulated IC TL072. please help?
Attachments
Last edited:
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
Attachments
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.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.