[sdiy] VCO reference voltages

[Harry Bissell]

YES!

I do not like using the power supply rails for references ESPECIALLY
on any circuit to be used as a module. It might be OK if you have total
control of a system (a closed-box synth), but it is a fatal flaw imho
for DIY circuits that others will use.

I like to use precision references as needed, and use a 5.1V zener shunt
regulator (which has nearly a zero tempco...) for front panel pots etc.

This way the circuits remain unaffected by other modules...

Of course this eliminates ~bugs~ as "features"... such as "I get a cool
sound when I turm ny filter all the way up and it drives all my VCOs
nuts..."

H^) harru



----- Original Message -----
From: cheater cheater <cheater00 at gmail.com>
To: David G. Dixon <dixon at interchange.ubc.ca>
Cc: synth-diy at dropmix.xs4all.nl
Sent: Fri, 16 Apr 2010 09:32:03 -0400 (EDT)
Subject: Re: [sdiy] VCO reference voltages

Most commercial *and* diy VCOs are crap.
Don't let popularity change your mind.

Just my 2c
D.

On Fri, Apr 16, 2010 at 09:52, David G. Dixon <dixon at interchange.ubc.ca> wrote:
> Does anyone here have any strong views on deriving reference voltages from
> the power supply rails in VCOs for comparator or schmitt trigger thresholds,
> etc (as opposed to using precision references)?  I know that most "DIY" VCO
> designs do so.  I'm wondering whether most commercial VCOs also do so, and
> whether it is considered "kosher", even in more expensive VCOs.
>
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-- 
Harry Bissell & Nora Abdullah 4eva