[sdiy] How To Make This Oscillator into a VCO

[René Schmitz]

>Next Question:   Can this be done without an OTA?  For the most part, i'm working with standard opamp pieces..  

All you'd need is one current source and a current sink and switch them with the schmitt trigger signal. (Thats how the OTA is used after all, its a switchable current source/sink in this application.)

To get rid of the second current source, usually one builds sawtooth oscillators and derrives the 
triangle via waveshaping. The problem is that getting I and -I match is difficult.

Cheers,
 René


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