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Help me understand the schematic of a looped pedal for guitar, which 'blends' signals

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gilli277

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Blend Effect

So im not fantastic with electronics and was wondering if you guys could help me out with some schematics. Basically i want/need talking through them, on whats happening where and what everything within the curcuit is doing.

**broken link removed**

It is a schematic of a looper pedal for guitar, which 'blends' the dry(input) signal with the wet(loop) effected signal.

Thanks for your help,
Much Appreciated
 

Re: Blend Effect

R12 / R13 makes a gnd so you have a symetrical powersupply out of one battery. C12 is to stabilize the powersupply and to make it low impedant for AC currents.

The opamp is configured as a summator (blender...) with a little amplification. It adds the signals of in1 and in2. (although invertered at the output -> minus sign)

Uout = -(R10/R1*Uin1)-(R10/R2*Uin2) So because R1 and R2 are the same amplification is about 2x.

C10 makes a lowpass filter. C11 is to decouple a dc voltage from the output.
 

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