[sdiy] VCA speed in tremolo

[>>>marjan<<<]

> Someone recently asked me to design and build a tremolo with incredibly
> sharp rise and fall times. Was going to do this with a FET but thinking
> about it this would be needlessly reinventing the wheel. I would like to
> devote any freetime I have to the LFO part. I think the standard 50% duty
> cycle requires investigation. Does anyone have the name/schematic of a
> favourite trem with very fast (ie vertical) rise and fall and minimal
> clicking I can draw on please?

You're describing chopper/gated effect, tremolo uses sine/triangle.
Anyway, check guitar stompbox schematics, not perfect but simple.
Look for Electroharmonix pulsar, it's classic, 741 and two
transistors for lfo (square). There are some better fet designs.
surf.to/stompbox
Or take your ordinary VCA, route some multi waveform lfo to it
and there you go. Trim for min 'click'.




-- 



marjan


me    : Marjan Urekar
e-mail: urekar.m at eunet.yu
s-diy : http://surf.to/marjansystems
music : http://go.to/forcemajeure