Schematics for FX loop with Opamp to add on an effect pedal???

[mathflan]

Hi,

I'm searching schematics of a FX loop using opamp or other, not with true bypass switch.
I'd like to add this on a effect pedal.

I didn't arrive to find this on the forum...

Thanks in adavance

[The Tone God]

Need more information. What is this going into ?

Andrew

[mathflan]

In fact I'am building an analog looper as you could see on this post :
http://www.diystompboxes.com/smfforum/index.php?topic=38638.0



I replace the LM386 by a TL071.
with the TL071, the tone pot and play pot ( play pot P3 put after Output of th TL071) are not very "smooth", and I have too much gain in the effect loop,..

[The Tone God]

Ok. With regards to yor effects loop I think all you should need is another non-invertering opamp buffer on the return. When the lopp jack switch is engaged the send already has a buffer (OA4).

As for you gain problem you can either convert P3 to a more standard volume control or adjust the gain of OA4 with a couple of resistors.

Andrew

[mathflan]

ok thanks you very much, I'll try that