IC IC - 531?

[Kevin Lightner]

>In the schematic for the Polyfusion VCA the op amp in the audio path is
>labelled '531'.  Anybody know what this is?  I want to try building a
>couple of these VCAs.  I figure a TL071 would work just fine, just
>checking to be sure though.
>
>Romeo

Do you mean the one on my web site? (I thought I changed the 531's to 081's)

Try a TL081. That is the opamp chosen later by Alan Pearce, Mr. Polyfusion.

Also, remove the 33pf compensation cap. It won't be needed with the 081.

-Kevin