BJ's 4046, PM, additive waves!

[Don Tillman]

   From: "Bjorn Julin" <bnillson at hotmail.com>
   Date: Sat, 23 Sep 2000 21:52:25 GMT

   http://home.swipnet.se/~w-133242/4046.htm

Fascinating.  Of course I have some comments...

That's a lot of waveforms.  And very strange looking waveforms.

While the waveform are unusual, I think the interesting part of your
project is how the waveforms are affected by the phase modulation.

You missed the waveforms that I would have tried first; the sawtooth-
fragment (tap the signal off just one side of the capacitor) and the
triangle (the difference between the two sides of the capacitor).

I don't trust that noise generator.  Are you sure it's not triggering
electric garage doors all over your neighborhood?

It looks like your sync input is really a half-sync.  The flop inside
the 4046 keeps an internal state when the two capacitor pins are
grounded.  Not that that's necessarily a bad thing. :-)  Grounding one
capacitor pin and driving the other positive should perform a more
complete sync.

Neat stuff!

  -- Don

-- 
Don Tillman
Palo Alto, California, USA
don at till.com
http://www.till.com