Cgs synth

>You suggest using a separate PSU for digital modules (burst
>gen, gate seq, etc)
>
>I wonder if a separate ground for all of them coming from the
>main PSU is enough to avoid noise on audio and CV circuits.

The noise is also put on the power rails by digital modules, so a separate
ground is not enough.

>I wonder also about another solution: a high quality (very well
>regulated/low ripple) switched type PSU can be used for the
>digital modules -they are very little and light, so one could put
>one on each cabinet. Or a linear PSU is still needed?

A switcher is possibly okay, though remember that some of the "digital"
modules contain analog portions as well.

At the very least, run two sets of power wiring back to the one supply, and
put chokes in line with each rail, and additional capacitors between 0 and
each rail to help suppress the noise.

Ken

_______________________________________________________________________
Ken Stone sasami@...
Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
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