ST TL072CN OP Amp connectivity

[johnnydiaz]

I would like to use the ST TL072CN OP amp and create a one channel mixer. I have an external variable power supply. I hooked up the op amp to my cd player and out of the op to a powered speaker and was able to play music but it had alot of distortion. I guess cause I dont have any capacitors or resisters connected. Can someone explain what the resistors and capacitors would do in circuit and why I would need it and where I would place them in circuit.

[budm]

Re: ST TL072CN OP Amp connectivity

Can we see your diagram so I can tell what is going on? Are you using BI-polar power supply?
This is great website for DIY audio project:
http://sound.westhost.com/projects.htm

[johnnydiaz]

Re: ST TL072CN OP Amp connectivity

Sorry I don't have a diagram. I used the pin outs below.

1 - Output 1
2 - Inverting input 1
3 - Non-inverting input 1
4 - VCC-
5 - Non-inverting input 2
6 -Inverting input 2
7 - Output 2
8 - VCC+

I connected my cd player to pin 5 as positive and pin 6 as negative. I used pin 7 from the op to my powered speaker and heard music but it was distorted. Also where would I would I hookup a potentiometer for volume?

[budm]

Re: ST TL072CN OP Amp connectivity

No feedback resistors, coupling caps, nothing? It is not that simple.
Please see the web site I provide to get basic understanding first.