[sdiy] Simple MIDI-syncable LFO...?

[Tim Parkhurst]

> > Anyone out there built something like this? I think this might be a neat
way
> > to do a quadrature LFO too (one clock, four counters & four D/As, pretty
> > cheap and easy).
> 
> You're missing it.  You don't need D/As,  that's what those resistor
networks
> are for.  You also don't need four counters,  just four resistor networks.
> Keep the impedance high enough and they won't interact with each other.
Or
> use some gates/buffers to isolate them,  lots simpler than duplicating all
> that other stuff.  Don Lancaster touched on some of this in his CMOS
> Cookbook,  and appears to have a bunch of related material on his web site
as
> well.
> 

Right, I see what you mean. Well, actually by "four D/As" I meant four R2R
networks. You could very easily use one counter and then wire up the R2R
networks so that your outputs were 90° out of phase, but I was thinking of
using four counters so that you could preset/reset them at different times
so that you could change the phase 'on the fly.'

> > With a little fiddling, you could make the phase between the outputs
> > adjustable (albeit in resolution-limited steps, but still might be fun).
> >
> > Whadaya all think?
> 
> I think you can do quite a lot with a mess of resistors...		:-)
> 
> 
> 
> 
> 
> 
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