This is remarkably similar to a module concept I've had for the last
year. Sort of like a Universal Slope Generator, but with a Hold time
parameter. I think you'll need an overall rate control though.
John Loffink
microtonal@...-----Original Message-----
From:
mark@... [mailto:
mark@...]
Sent: Wednesday, December 05, 2001 11:21 AM
To:
motm@yahoogroups.comSubject: [motm] proposed MOTM-390 uLFO
>a) 3 pots, 6 jacks:
(jacks cost less than pots, LED's draw current and make noise)
1) UP
2) DOWN
3) HOLD
6 jacks:
1) UP
2) DOWN
3) HOLD
4) THRESH
5) OUT
6) SLEW
The time set by HOLD begins when the rising voltage reaches 5V or when
the
falling voltage reaches 0V. THRESH uses a switched jack. With a jack
inserted into THRESH, and HOLD set to 0, the falling voltage begins when
the rising voltage reaches the TRESH voltage, the rising voltage begins
when falling voltage reaches 5V _minus_ the THRESH input voltage. Got
that?? Since the falling voltage cannot reach 5V, if THRESH input is 0V
the cycle is not retriggered. So if the input is a short trigger, it
cycles once then stops. If the input is a gate, the falling voltage (or
hold) begins when the gate is released. Note that HOLD also delays the
onset of an envelope. Modulating THRESH with a voltage can produce
various
functions, including a stepped function similar to S&H.
SLEW output is an output -- OUT run through a simple "degenerative
emitter"
(but without the trimmers or current source). It's more like a lag
circuit
than true sine shaper to save space and money, but it will produce an
approximated sine if OUT is a triangle.
Features:
Makes tri, up saw, down saw, pulse, trapezoid, various functions,
complex
LFO's, and a multitude of unique shapes.
No tempcos needed.
Cannot be replaced by a 320, 300, or 310.
Annoys people who already bought $erge and EM$ synths :)
Can also be used a VC EG.
Disadvantages:
"single sided" output.
No LED to indicate rate -- you'll have to use your ears, tough guy.
No simple "rate" control for tri waveforms (you need a mult).
No simple "PWM" for pulse waveforms (you need to modulate HOLD).
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