Basically, a Schmitt Trigger is a simple circuit (actually, they come in
chip form nowadays) which outputs a 'gate' (to use synthesizer speak)
depending upon the level of an input. The thresholds at which the output
goes high and then low again are independently controllable (this is called
'hysetersis,' which is probably how your furnace thermostat works, though
you control both thresholds with a single control... they are internally
staggered so that the furnace doesn't switch on and off too quickly, so the
"on" threshold is a few degrees higher than the "off."). So an incoming
voltage may rise and trigger the output to high at 4 volts, but as it falls,
it may not allow the output to fall low again until it goes down to 1 volt.
Hope that makes sense.
It's a useful component in a synthesizer. You could put such a device after
a lag integrator and make yourself a Gate Delay. I keep toying with that
idea but I have too many unbuilt MOTM kits on the bench right now...
Yes, a lag processor is one of many generic names for an integrator that
slows down and smoothes changes in voltages, the rate depending upon how
it's set. Other popular names are "glide," "slew limiting," "portamento,"
etc.
I believe Paul is currently working on such a module for release in the near
future.
Yeah, a joystick would be cool.
-----Original Message-----
From:thomas white [mailto:
djthomaswhite@...]
Sent:Thursday, January 27, 2000 12:27 PM
To:
motm@onelist.comSubject:[motm] Modular Growth Required
From: "thomas white" <
djthomaswhite@...>
Hi everybody,
Can anybody tell me exactly what a Schmitt Trigger does? 2nd
question:
Is a lag processor similar to a slew limiter? I am after
portamento in a
hungry way. Has anybody ever mentioned a joystick or other
control voltage
source module? Would be great for shifting audio gears
during stage use or
is a one on synth trance out session! Thanks for help,
Thomas White "T-Dub"
(∗my friends call me this, short for TW and my shameless
appreciation of
tape echo and dub music technologies.)
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