[sdiy] VCO tuning philosophy re-visited

[Harry Bissell]

in effect, yes its been done. There is a Roland synth that uses a current source and a cap
to generate approximate sawtooth waves, and the reset is digitally controlled. Any error will be
in amplitude, not frequency. Its not a 'bad' idea but it would sound like a DCO, not really
a VCO.

You could try and 'soft sync' a VCO to a DCO but that would not be too ideal either...

H^) harry


----- Original Message -----
From: luther rochester <luther.rochester at gmail.com>
To: Ian Fritz <ijfritz at comcast.net>
Cc: synth-diy at dropmix.xs4all.nl
Sent: Mon, 07 Feb 2011 12:09:11 -0500 (EST)
Subject: Re: [sdiy] VCO tuning philosophy re-visited

On 2/7/11 7:55 AM, Ian Fritz wrote:
> At 02:23 AM 2/7/2011, lanterma at ece.gatech.edu wrote:
>
>> Would you recommend the LM331 for use in regular audio VCOs too (i.e.,
>> non-ultrasonic ones)?
>
> That method has never been popular, I believe because the output is a
> narrow pulse. There is a mV level Saw available also, which you could
> try amplifying.


Forgive me if this is a noob question, but what about using the above 
example (or a DCO) for tuning stability, then have a second, 
nicer-sounding but perhaps less-stable-on-its-own VCO that's synced to 
it, but only give the second VCO at the outputs? Is this something 
that's been done?

-- 
./luther
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-- 
Harry Bissell & Nora Abdullah 4eva