A Quad Comparator Module with four independent Comparator sections that can each be used to detect a difference between control voltage inputs.
They feature our bullet-proof "anything-to-logic" signal conversion inputs and each section can be used for example to trigger a gate output at a precise point of an envelope's excursion, or to derive square waves with extremely wide-range VC Pulse Width Modulation - from most any type of waveform, (handy when interfacing different brands together!)
The Q output on each comparator will go logic high (true) if its input voltage is greater than its reference voltage. Each reference voltage is the sum of three components: the reference input jack, the reference voltage pot, and the global reference jack at the bottom of the module marked "ALL" (The ALL input can be thought of as a Control Voltage input for controlling the threshold or reference level of the whole group of comparators)
The NOTQ jack always presents the logical inversion of the Q jack for patching convenience. LEDs show the state of each Q output. (25mv of hysteresis is designed into the comparators for snappy, jitter-free operation)!
Pulling the reference knob will "link" the logical result of each comparator section to the one below causing its output to be inhibited. This creates mutually exclusive operation. Pulling the bottom knob will link that comparator to the top one. A linked illogical loop can be created by pulling all the knobs, or two separate logically linked pairs of comparators can be created by pulling knobs 1 and 3 for example.
Some Applications include:
Variable Probability Generator
Apply a noise source (it could be the same one) to all inputs. Dial in different reference levels and some outputs will fire more often than others. Linking will cause only one output to fire at a time with probabilities decreasing as you move down the module.
Velocity Dependent Triggering
Patch some envelope generators to several comparator outputs. Dial each reference to a different level and patch the velocity voltage from a MIDI keyboard CV box to the inputs of all. Different envelopes will fire depending on how hard you strike a key. Link comparators to get single envelopes or leave them pushed in to layer them. Very dynamic.
Keyboard Zoning as a Comparator Ladder
Derive separate gate signals for different keyboard zones like this:
a. Patch the keyboard voltage into all the comparator inputs
b. Pull the top 3 reference knobs to create a linked chain
c. Dial in different keyboard zone boundaries on the reference knobs, and each Q output will go high when you press a key in its zone
d. Using a Logipac module AND all of the comparator outputs together along
with the Keyboard GATE output so that each zone receives separate key
presses to make typical keyboard gate outputs in each zone.
Random patching of multiple inputs and outputs yields wild gate and clock
rhythms from only one or two input waveforms, (or course with a grand total
of nine inputs and eight outputs - you can count on this puppy to cause some
seriously illogical behavior!)