World's best VCLFO- $4ea

[Colin Fraser]

>----------
>From: 	J.D. McEachin[SMTP:jdm at synthcom.com]
>Sent: 	28 July 1997 13:19pm
>To: 	'synth diy general post'
>Subject: 	Re: World's best VCLFO- $4ea
>
>On Sat, 26 Jul 1997, Paul Schreiber wrote:
>
>These are 100% tested. All 3 outputs (saw, tri, pulse w/PWM) work to spec.
>
>It sounds like these would work fine in a Jupiter6, which has a custom
>sync circuit by Roland.  For that matter you could clone the sync circuit
>(which is fairly simple), and sync them in a DIY circuit, though the sync
>sound is more "Rolandish" than "CEMish" (Hmmm...#9742 on list of things to
>do - investigate this on an o-scope...). 
>

The E&MM Spectrum synth (schematics are on the web somewhere) also has a
3340 with a separate sync circuit, and the article text explains why.
Basically the 3340 doesn't have 'real' sync. The incoming sync pulse
forces the direction of the triangle wave to reverse but doesn't reset
the voltage level. 
According to the E&MM article this doesn't sound as good.

The spectrum circuit adds 2 sync modes - one that resets the wave to its
most negative point, the other sets it to halfway. Also the PW output
from the synchronising oscillator is used to control how often the
slaved oscillator is synced - if that doesn't make sense have a look at
the article. If you can't find it it's on my home PC.

Colin f