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

Schematic
Panel



Passive Mixer
A simple passive mixer with a switched output matrix

Schematic
Panel


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

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

Schematic
Panel






White Noise Generator
A very simple white noise generator with a nice bright output

Schematic
Panel



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

Schematic
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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

Schematic
Panel






Passive Diode Circuits II
Another collection of passive diode based circuits

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

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

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

Schematic
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Footswitch/Attenuator
Two attenuators and two footswitch interfaces

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

Schematic
Panel




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.

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

Schematic
Panel




Tudor3 Phase Shifter
Based on the deceptively simple David Tudor box, but with a twist
Schematic
Panel

JLH Joystick Controller
Dedicated to J Larry Hendry aka Stooge Larry who gave me this circuit back in the day...
Schematic



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