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Can you suggest a suitable voltage controlled oscillator circuit for me...?
I would like to build several identical voltage controlled oscillators that can be plugged together so that the output of one can be used to controll either the amplitude or frequency of another.
By using the output of two modules to control that of one other, I would then be able to produce a multi tiered pyramidal configuration with one complex output.
Other variants of this configuration would also be possible.
I would imagine controlling the initial characteristics of the bottom tier modules with potentiometers and playing the output through a loudspeaker.
Each unit could also have a key to reset it's phase thus creating a kooky musical instrument.
Sounds like the start of a modular synthesiser. All you need is a nice voltage controlled filter for some excellent sounds!
Check out the XR2206 chip. It has been around since the 70's but it is still available. It outputs a square wave plus either a sine or triangle wave. It is sweepable over a wide range and has a built-in amplitude modulator.
Sync-ing it is difficult but can be achieved by putting a FET or analog switch across the timing capacitor and pulsing it on briefly - this shorts out the capacitor and resets the phase to 0 or 180 degrees.
Other chips that were often found in voltage controlled oscillators are the ICL8038, the CA3080 and the LM13600 and 13700. Google these numbers with "VCO", you should turn up some good stuff.
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