Synth DIY

Here's an archive of some of my DIY modules and 5U conversions:

4520 Clock Divider
Apart from a mult, this was probably my first effort at Synth DIY, it's a quick and dirty clock divider. No buffering, no smoothing caps, just a voltage regulator and a 4520 counter

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Passive Mixer
A simple passive mixer with a switched output matrix

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Quad Super Warp Generator
Based on the Razmasynth Super Warp Generator, this passive noise generator has four channels and switched LEDs

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Orgo
An expanded version of the simple OR logic circuit with dual outputs

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White Noise Generator
A very simple white noise generator with a nice bright output (schematic corrected 17.03.18)

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40106 Hex VCO
Two versions of the simple, but somewhat unpredicable 40106 based VCO

Schematic A (Single Rail Supply)
Schematic B (Dual Rail Supply)
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Passive Diode Circuits I
A nice collection of passive diode based circuits, super simple for a beginner

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Quad Buffer/Relay Driver
Another early DIY effort. This is a panel of voltage followers that can also drive a set of relays for remote footswitch activation

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Passive Diode Circuits II
Another collection of passive diode based circuits

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Passive VCA/LPG
A variation on the classic vactrol based circuit using switched capacitors to alter the filter response

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Lag/Inverter
Another early one. Two simple circuits without buffering or smoothing caps. I still use this quite a lot...

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Feedback Loop
A basic feedback loop with A/B effect switching

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Footswitch/Attenuator
Two attenuators and two footswitch interfaces

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Master Reset
A little utility panel to reset multiple sequencers, clock dividers etc either manually or from an external gate

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DR3 Reverb
Based on the application notes of the Accutronics DR3 stereo reverb brick but using single rather than dual pots to exploit the module's internal routing.

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Chua/Chaos Oscillator
Another very old experiment that went through several incarnations. This version is pleasingly idiosyncratic

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Tudor3 Phase Shifter
Based on the deceptively simple David Tudor box, but with a twist
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JLH Joystick Controller
Dedicated to J Larry Hendry aka Stooge Larry who gave me this circuit back in the day...
Schematic