[sdiy] Daft modulation scheme?

[Justin Owen]

I think it's an interesting idea and since you're modulating virtual ground - what's to stop you modulating it independently for each oscillator? Or using one oscillator to modulate the others virtual ground... etc, etc, etc!

Justin




-----Original Message-----
From: Colin Hinz [lists at meccanion.com]
Received: 26.04.2012 17:14:04
To: synth diy
Subject: [sdiy] Daft modulation scheme?


Hey all,

Recently I breadboarded a dual oscillator circuit which is powered from
a single supply with virtual ground, and owing to brain spasm managed
to make the virtual ground circuit less than optimal -- voltage divider
with high impedance, no filtering capacitor, and as a result it was
about as stable as....OK, make up your own analogy.

In effect the bouncy virtual ground caused the two oscillators to
cross-modulate. An interesting effect, I guess, but this got me
thinking -- what if the virtual ground was deliberately not a nice
steady DC? What if, say, it was modulated by an LFO?

Granted, the DC supply may have to be increased by a few volts to
avoid clipping the oscillator output, but aside from that.....is
this a sane thing to do? Bear in mind that I'm not trying for
pitch-perfect tones, but rather "noise electronics" a la the
Weird Sound Generator.

- Colin

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