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CGS592 V2.0
Smooth & Stepped Generator

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The CGS592 is a complex multi-functional module that provides various slew and sample functions.

The Smooth function will place a positive and negative slew (glide) on a changing input voltage for lag effects, voltage controlled portamento, and non-linear, low frequency filtering.

With the [CYCLE] jack patched to the [IN], the unit will oscillate yielding a voltage controlled triangle wave LFO. A high level into the [HOLD] input will hold the current output level, whether the unit is oscillating or processing an external control voltage. This is identical to a track-and-hold function.

The Stepped function can be used as a sample-and-hold with voltage controlled slew rate limiting. Slew rate limiting limits the size of the step at the output. With the step size limited to a small value, if the [IN] input is a random voltage, the [STEPPED OUT] output is a random voltage also, but it will only vary slightly from step to step, gradually covering the entire range of the input random voltage. No large changes in the output will be allowed.

With the [CYCLE] jack patched to [IN] and a trigger applied to the [SAMPLE] input, complex staircase waveforms are generated.

NB: The [RATE] controls reflect the 'amount of slew' that is being applied such that when in CCYCLE mode the frequency (rate) of the cycle will DECREASE as you turn the control clockwise.

The COUPLER is an internal comparator comparing the Smooth and the Stepped Outputs. This is useful for generating complex control voltages and for patching to a random voltage generator. NB: The Coupler outputs are most usually used to link the Smooth & Stepped Generator sides together. The outputs are especially stiff pulses generating near-to-rail outputs so users should be aware that these are "out of the ordinary" outputs and due attention must be paid when patching to other modules.

NB: JP1 is used to aid calibration and must be installed for normal operation.


PCB Dimensions: 2" x 6" with 3.2mm fixing points 0.15" from the edges
Power Consumption:
+12V @ 26mA
-12V @ 20mA

Original article, art & design copyright by Ken Stone

Email:  elby-designs@bigpond.com
© Copyright 2000. All rights reserved.     Revised: January 27, 2024