[sdiy] simple lfo circuit ?

[patchell]

    I would think that if you use a pair of zener diodes on the output of the comparator
(with proper limiting resistor), this would go a long way for making things more
symetrical.

Mountain Man wrote:

> Hmmmm.  I don't care about the duty cycle of the square wave being other than 50%,
> since I only intend to use it for triggering a S/H.  I would like the triangle to be
> symmetric, however.  Will this be a problem?  If so, can someone give a specific
> suggestion for a replacement opamp, or other mods that will fix this?
>
> Thanks,
> Elby
>
> Tom May wrote:
>
> > My problem with the ASM-1 LFO is the duty cycle is not 50%, unless you
> > can find an opamp with a symmetric output swing at each rail.  Perhaps
> > a rail-to-rail opamp would fix things, as long as your supply rails
> > were properly adjusted.
> >
> > fTom.
> >
> > Mountain Man <mtman at cloud9.net> writes:
> >
> > > Of course, Darren, my pleasure :) I settled on the ASM-1 LFO.  It is
> > > a *very* simple circuit, and produces both a square and triangular
> > > output, and has only a single rate control (which is what I was
> > > looking for, since I'm trying to cram a bunch of stuff into a teeny
> > > control panel).  I've included the link to the ASM-1 homepage below,
> > > you'll find the LFO schematic linked to from near the bottom of the
> > > page.  Hope this helps :)
> > >
> > > Elby
> > >
> > > http://www.it.kth.se/~e93_mda/synths/friends/stopp/#7
> > >
> > >
> > > Darren Reid wrote:
> > >
> > > > Hi!
> > > >
> > > > > Actually, I got several replies, Darren :)   I'll certainly study the
> > > > > circuits you point out, thanks very much  :)   The folks on this list have
> > > > > been great!  I'm learning a lot, and appreciate the openness and
> > > > willingness
> > > > > to share with a beginner that people here have demonstrated.  What a great
> > > > > bunch!
> > > >
> > > > Cool!
> > > >
> > > > Well, as I'm a complete raw newbie too...if you find anything interesting,
> > > > please share :)
> > > >
> > > > I'm looking to start building a very simple modular this summer, and need
> > > > very simple schematics to do it with.
> > > >
> > > > -Darren

--
 -Jim
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