s to r
farky at ix.netcom.com
Sat Mar 11 21:39:39 CET 2000
Here's the circuit I had set up today that almost worked for square to
split the signal path
put one square wave through an op amp integrator, with supply voltage at
0 and 9v
put the other square wave through an inverter, then through an op amp
supply voltage as above. (the input square (at the beginning of the
chain) is at 0-9v)
now linearly mix the two signals. (each signal is a sawtooth with half of
its blades missing)
we're combining two 180 degree out of phase partial saws.
Here's what happened:
there was some output error voltage, but I did have a sawtooth. The
problem was that one of the saw waves wasn't hitting zero so it appeared
that we had a double length wave with two teeth per cycle.
How do we get rid of the DC? Capacitors on the output of the amps?
I'll keep trying.
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