[sdiy] simple lfo circuit ?

Tom May tom at tommay.net
Sat Mar 31 18:52:51 CEST 2001


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



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