CGS Dual Psycho LFO

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"This is a cat girl synth ( Ken Stone) dual psycho lfo. 2 semi random lfo with frequency, depth and lag controls. Also a low voltage pulse output based on the levels of the the lfo voltages - will trigger some other synth modules. It is built in a frac rack sized panel( about 3x 5.25") with plastic graphic overlay. requires +/- 12-15 volts to function. see CGS site for more info.

http://www.cgs.synth.net/modules/psycho_lfo.html

from the site:
'This is a bizarre little LFO that produces a wide range of pseudo random effects..."

add to your existing modular for a new modulation twist. ask question before bidding. working but offered as-is - you need some diy electronics skills to install and use.'

MOTM Super Psycho LFO

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"Catgirl synth Super Psycho LFO module, built by me about ten years ago with Blue LED's"

Super Psycho LFO synthesizer module-Elby Designs cgs721

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"Each of the six oscillators can vary from low frequency rhythms to the audio range, and each is connected to one of the LEDs along the right side of the panel - so that in a glance you can get an idea of what each one is up to.

This module is a much expanded version of the Psycho LFO, featuring six free-running oscillators, each variable between LFO and audio ranges, two of which can be switched to have triangular wave outputs. Each oscillator can be switched between low and high ranges, as well as off, and also has a rate LED, to allow visual determination of the frequency at which it is running. As per the original, there are also level and glide controls.

This module can be used to create a range of pseudo-random modulation voltages that can be used to generate unusual sequences, control VCFs or or VCAs etc. When run at higher frequencies, it can be used as a series of audio drones, or to generate complex sounds by frequency modulation a VCO.

how it works

The Super Psycho Modulation Source is a fairly simple circuit with a lot of repetition. The circuit consists of several distinct blocks. The first are the oscillators, each based on a section of a 40106 hex schmitt inverter and their associated components. The switch allows extra capacitance to be added, reducing the speed of the oscillator to a lower range. The same switch allows the capacitor to be bypassed to the negative rail via a protection resistor, disabling the oscillator, and setting its output to near 0 volts. The 1M RATE pots allow the upper frequency range to extend over a large portion of the audio spectrum, and in the lower frequency position, to extend from sub-audio to low audio frequencies.

Two of the oscillators are equipped with voltage followers that follow the the, roughly, triangular shape of the wave present on the oscillator capacitors. The 100k and 270k resistors on the output, when coupled to the virtual ground summing node of the following mixer, via the switch, correct the amplitude and offset of the triangle wave.

The next block is a traditional op amp inverting mixer stage. Signals from the six oscillators are mixed through 470k resistors, the overall gain controlled by a 100k pot in the feedback path of the op amp.

What is interesting here is that in order to keep the output signal of the mixer positive without the need for an additional inverting stage, the chip used to build the six oscillators is powered from the negative rail, it's positive power pin connected to 0V and its earth pin connected to -15V. Take special note of this, because it is an unusual way to power a digital chip, and inadvertent poking with a logic probe powered from the positive rail could cause you grief!

The final stage is a simple glide circuit consisting of a potentiometer, a capacitor and unity gain voltage follower. The switch is to allow easy switching in and out of a pre-adjusted glide setting."

Catgirl Cynare Analog Drum Synth Module

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"This is an MOTM-format kit for a Catgirl Synth Cynare Analog Drum Synth module. I bought it recently from Scott Deyo at Bridechamber.com and everything you need to build the module is here aside from the wire and the skills and tools to build it. From what he said this is the last of the original run aside from one other one which he was going to keep for himself so in a way this is a rarity. An audio sample can be found at the web site."

MOTM format CGS Bi N Tic VCO

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1. MOTM format front panel
2. Mounting Bracket
3. CGS PCB with some resistors populated but not soldered in
4. CGS mixer PCB

MOTM format CGS Bi N Tic VCO / Filter

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1. MOTM format front panel
2. Mounting Bracket
3. CGS PCB with some resistors soldered
4. CGS mixer PCB

Two Ken Stone Wavetable Oscillator pcb sets w/ ROMS

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"This is a great find for those who enjoy building custom modules. these are increasingly harder to find. especially with all the boards together w/ their respective ROMs, let alone two full sets.

These are both the version 3 board without the 2532 error on them."

CGS Ken Stone Drum Simulator

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"In Frac rack panel.
has 2 drum tones and has been modified. one now goes much lower than the other for bass drum sounds. they both now also go high enough to squeal!
jacks are for trigger in and audio out. trim pots have been brought to the front as pots and are for pitch, resonance, and tone. includes a power cable for connecting to a standard Blacet type power supply, +/- 15 volts." more info