[sdiy] Triangle-to-saw conversion

[ASSI]

On Wednesday 17 February 2010, Tim Parkhurst wrote:
> Actually, the method that Paul and I described do this (produce a
> saw at the same frequency as the triangle).

...under certain conditions (the triangle must be all positive or the 
reference for the flip operation be chosen wisely).  I put the smiley 
there for a reason, but I wasn't only joking, either.  I should still 
have a notebook somewhere from 25 years ago where I painstakingly 
derived (graphically) how to combine all kinds of signals coming from 
a single 555 timer and a CMOS divider to come up with interesting 
waveforms.  There might even be a Johnson half-decade in there, I 
think I discovered that IC at the same time.  The one problem I 
couldn't solve back then was how to "pulse-width" modulate a triangle 
to saw and back, but the rest of it was working nicely.  The latter 
problem has been solved at least on paper, just not with as few 
components as I had hoped all those times ago.


Achim.
-- 
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