[sdiy] MOTM300 is an interesting design

Aaron Lanterman lanterma at ece.gatech.edu
Sun May 14 11:26:24 CEST 2006


As a side note - Paul's VCO is a sawtooth core, but the integrator isn't 
quite like anything I've seen. There is no integrating op amp. The cap 
just sort of hangs out, and is buffered by this dual-FET uberbuffer 
between it and the relatively low-impedance input LM319 (it reminds me of 
some early Buchla stuff where he puts FETs before BJT op amps).

And the intergrating cap it discharged with... a 2N4402 BJT???? Not a FET 
or MOSFET? Strange and interesting...

The summer stage looks top notch... all OP275s and such...

- Aaron

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