[sdiy] Dual/quad opamp bleed-through

[Dave Manley]

I'm going to play devil's advocate and mention a few well known
synths that have multiple VCOs on the same board: Moog Mini,
ARP Odyssey, and KORG MS-20.  They don't share ICs, but
they are on the same board.

Do any of these synths have unintentional oscillator sync problems?

-Dave

> The first prototype of my dual VCO module had this same problem.
> I then split the two VCOs onto separate boards with shared panel 
> controls.
> This design still had sync problems. It was only after I placed the 
> boards at least 3/4" apart using standoffs that the syncing was
> eliminated. This was with good de-coupling and hefty gauge star wiring 
> etc.
> No shared ICs or even on the same board.
>
> Bruce