[sdiy] How To Make This Oscillator into a VCO

[patchell]

    I would have to look at the circuit again...but I think that the common
mode input range needs to include the negative voltage terminal on the opamp.
This is strictly a single supply type application, although, I could be wrong.

    One big disadvantage of this circuit is that it is stricktly linear
response.

Gavin wrote:

> Wow! nice circuit, now ill this work with other op amps?  or is it specific
> to the properties of the lm324?
> ----------
> >From: patchell <patchell at silcom.com>
> >To: bill berzinskas <housenationmedia at yahoo.com>
> >Cc: synth-diy at dropmix.xs4all.nl
> >Subject: Re: [sdiy] How To Make This Oscillator into a VCO
> >Date: Sat, Oct 19, 2002, 4:46 PM
> >
>
> >    Yes it can...look in a National Semiconductor data sheet for the
> >LM324.  There is a VCO that will produce a triangle that uses no OTAs.
> >In fact, this is what I built for my first synthesizer back in 1974.
> >Worked a lot better than the Paia 2720 oscilator...in some ways.
> >
> >bill berzinskas wrote:
> >
> >>    Thanks for all the good responses..  tons of good info..
> >>
> >>
> >>
> >> Next Question:   Can this be done without an OTA?  For the most part,
> >> i'm working with standard opamp pieces..
> >>
> >>
> >
> >--
> > -Jim
> >------------------------------------------------
> >* Visit:http://www.silcom.com/~patchell/
> >*-----------------------------------------------
> >*I'm sure glad Merry Christmas comes just once a year
> >* -Yogi Yorgensen
> >------------------------------------------------
> >
> >

--
 -Jim
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* Visit:http://www.silcom.com/~patchell/
*-----------------------------------------------
*I'm sure glad Merry Christmas comes just once a year
* -Yogi Yorgensen
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