[sdiy] Discreet Dual Pulse Gen

[Michael Ruberto]

I have been attempting to simplify the design of the dual pulse generator. 
It has been completely redone with mostly discreet circuitry. There may be 
some blunders in the design so I appreciate corrections.

http://frankentron.freezope.org/source/idea1.gif

The heart of the circuit is two Schmitt triggers. They are setup to trigger 
at about 2.5V. The idea is that one detects the Negative portion of the 
input wave and the other triggers on the positive. A vactrol controls the 
amplitude of the input signal which provides a pwm function. The outputs of 
the 2 schmitt triggers are level shifted by a varying bias from pin 7 of the 
opamp. As this bias increases to positive the pulse from the positive 
Schmitt will be reduced in amplitude and the negative pulse increased in 
amplitude where the 2 pulses are mixed together. This gives a means of 
controlling the symetry of the output pulse with a CV.

If anybody is feeling froggy I'd love to know if it will work in a 
simulation before I hunker down with a breadboard for a couple hours.

M. A. Ruberto

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