[sdiy] Op amp for saw core VCO

blacet at blacet.com blacet at blacet.com
Sun Oct 26 19:39:57 CET 2014

TL074 JFET input.

High input impedance. The CA3130 is MOSFET.

Back before JFET op amps, I used to see a FET before the input of a
"regular"  op amp for the VCO core.

> Hey,
> So your standard sawtooth core VCO with the integrator and discharge FET.
> I am re-designing an existing product that uses a CA3130 as the
> integration amp and want to update it. What is a good modern amp for this
> application? Or if you prefer, what kind of amp is needed here? Precision?
> High speed? I have used an OP37 and an OPA602 with good results, but I am
> hoping for an inexpensive alternative.
> Thanks!
> Tim Ressel
> Circuit Abbey
> 503-750-9331
> timr at circuitabbey.com
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