[sdiy] VCA madness

[harrybissell]

GOOD VCAs with accurate DC response are not easy or cheap...

probably the closest might be the CA3280.  Most OTA are not that
accurate.

For LFO, ADSR etc its likely a cheap VCA will be good enough... just
don't try to process pitch CVs with them.

If you need accurate, I'd go with plan 'B' ... otherwise plan 'A' is just
as good

H^) harry

Simon Richardson wrote:

> Hi all,
>
> I've built two ASM-2 boards with a view to putting together a big
> banana patch thing. Between them the boards provide 4 VCAs which should
> be enough, but I'm tempted to put in a lot of extra VCAs since VCAs are
> fairly easy and inexpensive to build.
>
> Plan A
> There would be a VCA on each of the major outputs - LFOs, ADSRs, VCFs,
> etc. Done like this the VCAs won't visible at all; there will be AM
> controls on the outputs instead.
>
> Plan B
> Use the 4 VCAs as mixers with AM on the outputs, perhaps 4 inputs each.
>
> So... is Plan A crazy? I know the answer is - "if that's what you want
> then it's right" - but I'd be interested to hear any opinions about
> doing this.
>
> Simon