[sdiy] ARF Gate Delay

[Brian]

The ARP 3620 keyboard has a gate delay circuit used in delaying the lfo, or
vibrato.  Look at the 'Vibrato Delay & Wave Shaping' portion of the
schematic.

-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Dave Magnuson
Sent: Sunday, November 11, 2001 10:12 AM
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] ARF Gate Delay


Hi everyone,

I have a schematic for the ARF (Aural Research Facilities) Gate Delay
v1.00.  This was designed by Ric Miller.  It's pretty simple... works by
charging/discharging a cap through 2 pots.  One for the "On delay" and one
for the "Off Delay".  The signal then gets sent through a comparator to
create the gate out.

Has anyone ever built this circuit, or something like it?  I'd like to
build a voltage controlled gate delay, and was wondering if this is a good
place to start my experimentation.  Unfortunately, I can't find this
particular schemo online anymore... All I have is a copy I printed.  I
could scan it and post it on my server temporarily if anyone wants to see
it.  Also, does anyone have contact info for Ric?  All the links online
seem to be dead.

Also, if anyone has links to different ways of creating a gate delay, I'd
love to see them.  Weren't "Delay" controls available on the envelope
generators in some popular commercial synths?  How was this generally
achieved?

Thanks in advance,
Dave Magnuson


Resonant Frequency:
resfreq at hoohahrecords.com
http://www.hoohahrecords.com/resfreq/index.html