Opamp audio mixer circuit question

[diy didi]

Good day.
I want to build the attached circuit. I want to minimize component count a little as this is part of a bigger project.
Are the input capacitors really necessary?
These inputs will only be connected to other audio sources such as an ipad or mixer.
Thank you in advance.

 

[Nigel Goodwin]

You don't show enough of the total circuit to say - their requirement depends on stuff you don't show.

 

[diy didi]

You don't show enough of the total circuit to say - their requirement depends on stuff you don't show.

The inputs on my circuit go to input jack sockets.

 

[Nigel Goodwin]

You're still giving no information?, does it work by magic?, is there no kind of power to it?.

If the top of the pots go directly to jack sockets, then you need capacitors between the sockets and the pots, as you've no idea what's connecting to them.

Likewise, it's sensible to keep the capacitors already in the circuit, as they do no harm, and depending on the entire circuit (which we don't know) may be essential.

 

[gophert]

Yes

 

[audioguru]

Your opamp has no very important power supply. Since the (+) input connects to ground then the power supply must have plus and minus voltages.
Then if the input signals have no DC on them, the input capacitors are not needed.

 

[Ramussons]

Your opamp has no very important power supply. Since the (+) input connects to ground then the power supply must have plus and minus voltages.
Then if the input signals have no DC on them, the input capacitors are not needed.

Similarly, the Output Capacitor is also not required.

 

[Nigel Goodwin]

Similarly, the Output Capacitor is also not required.

I would disagree, the major reasons for the output capacitor are to prevent the mixer sending DC out to what it feeds, but also to prevent DC coming back in from what it feeds. This is also why I said it was essential to have capacitors between input sockets and pots, in case it's connected to badly manufcatured units without output capacitors.

 

[Ramussons]

Of course..... Missed that one