[sdiy] VCO reference voltages

[cheater cheater]

On Fri, Apr 16, 2010 at 15:42, Harry Bissell <harrybissell at wowway.com> wrote:
> 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..."

That's a good example. Or 'running an arpeggiator clock fast makes the
sound different even though the arp isn't on!'

:-)

> H^) harru

Harry, are you ok? You look a little bit ill.. your 'y' looks almost
like a 'u' there, you should get that checked.

:-P

D.


> ----- 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
>