MOTM

At 9:17 AM -0500 2002/04/10, Paul Schreiber wrote:
>  >   What I call the 125 (Paul may elect to use another number) is not an
>>  "instant gratification" module.  You have to tweak it to find a 'sweet
>>  spot'.  Here is Anderton's article on his PWMult:
>>
>
>BTW: this is a "Anderton approved" MOTM module. I may jazz it up some as well.
>
>Paul S.

I built one of these PWM circuits from the Anderton article back in 
the early 80s and can attest it's utility. In addition to creating 
_extreme_ pulse width modulation effects in the audio realm, it's 
also great as a random gate generator (drive it with a slow LFO). 
Both the time interval between gates and the gate high time can be 
modulated under voltage control. I modified the circuit so it was DC 
coupled throughout to get this capability (inputs and outputs both 
working at +/- 5 V). I also modified the input circuitry so it had 7 
knobs and 8 jacks:

K1 - xor A output shape (same as R5 on shemo)
K2 - xor B set point
K3 - xor B control signal level (reversing attenuator)
K4 - xor C set point
K5 - xor C control signal level (reversing attenuator)
K6 - xor D set point
K7 - xor D control signal level (reversing attenuator)

J1 - input signal
J2 - xor B control signal
J3 - xor C control signal
J4 - xor D control signal
J5 - xor A output signal
J6 - xor B output signal
J7 - xor C output signal
J8 - xor D output signal

Sounds like a 2U module. I'm looking forward to seeing an official 
MOTM version of this circuit.