[sdiy] Soft sync circuits

[Magnus Danielson]

From: harrybissell <harrybissell at prodigy.net>
Subject: [sdiy] Soft sync circuits
Date: Wed, 23 Feb 2005 22:14:23 -0800
Message-ID: <421D70BE.C9F3E3D3 at prodigy.net>

> Hello All

Harry,

> thinking of some soft sync circuits.  I'm tring to do this on a sawtooth
> core.  What I'm thinking of is a comparator the only allows an early reset
> if the reset pulse comes within a certain percentage of the natural
> reset time.
> 
> Think of a comparator whose output is AND-ed with the sync signal so
> that the main reset comparator is triggered early.
> 
> It might be possible to make the sync pulses of a fixed, small amplitude
> and sum them into the comparator trip point.
> 
> what think ye ?   Any schematics out there for my perusal ???

If you are trying to recreate the CEM "soft sync" (which is NOT soft sync in my
book!!!) you should be doing it on a triangular core. Then it is trivial. The
sawtooth you can get by waveshaping from the triangular core anyway.

While the sawtooth core is simple, I think the triangular core has benefits
which makes it more versatile than the sawtooth core. Look at the Buchla
schematics for inspiration if nothing else...

Cheers,
Magnus