[sdiy] Op amp for saw core VCO

[Oren Leavitt]

On 10/26/2014 1:29 PM, Tim Ressel wrote:
> 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

High input impedance for sure, and a fast slew rate to keep the reset 
step sharp.
I'm with Ian on the OPA134.

- Oren