Opto FET Ring Modulator Design Completed

[rring]

Earlier, I posted this topic on the schematics page but now the design is pretty much finalized so I am going to post the final schematic here:


There is lots more technical info and a link to the PCB board at www.circuitsalad.com

One very important feature of the design is the elimination of modulation leakage because of the opto-coupling of the modulation signal. Also, many other OP amps will work in place of the TS922.

The MAX 7410 is an adjustable from 1Hz-15KHz,  5 pole,  low pass filter. While it is somewhat exotic, it provides some really nice filter effects for the modulator.
When using very low modulation frequency and sweep the low pass filter - you end up with a phaser like sound from all the phase shifting that occurs in the filter and the mixer.

here is a demo of the pedal built in a 1590BB enclosure:

[Keppy]

Thanks for sharing!

[glops]

Very nice!