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.