741 problelm

i have an inverting amplifier circuit in clap switch project , it's dc output is full supply voltage although non inverting input is biased to half supply , i checked the circuit the feedback is connected correctly . any help
thanks

 

If you post the schematic then we may be able to help.

 

My crystal ball says you have an error in you circuit connection. For more detail, post a schematic.

 

here is the circuit

 

i put image url but cant see
so i add the url
http://www.2shared.com/photo/dLDqr60J/clapswitch.html

 

It's a guess but I suspect there your feedback network is open, perhaps the pot. What is the value of the pot resistance?

 

Your output of 555 (p3) is directly connected to Vcc (12V). Q1 would be conducting all the time.

Some of the junction dots are in the wrong places too. May be there are some other mistakes that I have not yet spotted. I think you need to improve the schematics so it can simulate properly.

Allen

 

here is a the circuit again
the pot is 100k
http://www.2shared.com/photo/9Km_xLqv/clapswitch.html