freestompboxes.org

PDF: Nevermind Rolf Harris...

The most wacky, but perhaps most interesting project I've come across in electronic magazines: couldn't it be adapted to a freaky guitar effect? It takes a microphone input... so it literally already a sound processing devices. Should replace the GE transistors with SI and make it negative ground, but I have a hard time understanding what the transformers do.

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Nice.

The transformer 1 & 2 are there in the classic passive ring modulator topology that is common among synth modules and has been used in a few guitar pedals too.

The option of using a transformer (3) to generate the modulation frequency isn't too pedal friendly.

Interestingly, I don't remember seeing a GE driven "passive" ring modulator before.

Thanks again Modman.

There is an explanation about ring modulation:

https://en.wikipedia.org/wiki/Ring_modulation

Cheers,
Jose

As cspar says, T1 & T2 are phase splitters for the two inputs to the ring mod; T3 is a weird way to turn mains supply into a 50/60 hz carrier signal. I think most of us here would prefer to build the oscillator for this purpose.