VC delay module ideas?

[Fraser, Colin J]

> -----Original Message-----
> From: John Speth [mailto:johns at oei.com]
> Sent: 29 October 1998 17:29
> To: Synth-DIY List
> Subject: VC delay module ideas?
> 
> 
> I'm thinking of designing and building a CV controlled analog 
> delay module
> using one of those Panasonic delay lines as the core delay 
> device.  Does
> anybody have any good ideas for features something like should have?

It would be nice to be able to sync to DIN Sync / Midi clock, with delay
time settable as a function of tempo.

I've been looking at this one for a while, and recently came across a
circuit in an old electronics mag to generate the clock pulses needed to
drive the BBD from a normal squrewave pulse (two pulses out of phase, with a
gap between them), so I may be doing this myself soon, like this:

Din Sync -> PLL configured as frequency mulitplier with selectable factor ->
BBD clock gen. -> BBD

Make the oscillator frequency control on the PLL switchable, and you could
switch between Sync and vc control.

I don't expect to be building this too soon tho', as I just bought a Lexicon
MPX100, which has midi syncable delays that sound very nice.

Colin f