SERGE MODULAR FOR EURORACK – Under licence from Serge Tcherepnin – This is not a full kit.

“Serge Modular” is an analogue modular synthesizer system developed by French composer and electronic designer Serge Tcherepnin in the 1970s at The California Institute of the Arts. Serge’s vision to create a “people’s synthesizers” led to a unique modular music system with an iconic design.

In collaboration with and under licence from Serge Tcherepnin, Random*Source offers a range of Serge modules in Eurorack format, combining the original Serge circuits with the advantages of today’s technology.

This Random*Source Set contains:

• Color printed front panel, 2mm, cnc made in germany
• 1 Serge VCFS Euro pcb (through-hole, no components mounted)
• 1 matching component pcb

*** THIS IS NOT A FULL KIT (AND NOT A BUILT MODULE)! **

SERGE MODULAR FOR EURORACK – Under licence from Serge Tcherepnin – This is not a full kit.

“Serge Modular” is an analogue modular synthesizer system developed by French composer and electronic designer Serge Tcherepnin in the 1970s at The California Institute of the Arts. Serge’s vision to create a “people’s synthesizers” led to a unique modular music system with an iconic design.

In collaboration with and under licence from Serge Tcherepnin, Random*Source offers a range of Serge modules, combining the original Serge circuits with the advantages of today’s technology in Eurorack format.

SERGE VARIABLE RESONANCE FILTER (VCFQ)

The Serge Extended Variable Resonance filter (VCFQ) is probably the most famous filter of the Serge system and one of the essential Serge modules. It is an excellent, extremely versatile general-purpose VCF that provides simultaneous low-pass, high-pass, band-pass and notch (band-reject) outputs combined with unique flexibility. Its trigger in, LOW mode and self osciallation allow a variety of uses from Oscillator to VC processing.

Now – for the first time ever and licenced by Serge – the VCFQ is available as DIY kit for Euro.

Build documentation: Serge VCFQ BOM / Build doc

Thonk Kit Build Notes: Here

Some details of the Random*Source Serge VCFQ module kit:

• Under licence from Serge Tcherepnin
• Designed for High-end VCAs (THAT2180)
• No matching of transistors required
• No wiring needed
• Eurorack format (3U), 14 hp
• Power consumption: 52mA @ +12V, 52mA @ -12V
• Module depth: < 40mm (1.5″)

THIS IS A FULL DIY KIT

It contains all components required for a complete build, right down to rack screws and power cable. We selected and used the high quality parts as specced by Random*Source. Random Source have created a step by step build doc for this project

SERGE MODULAR FOR EURORACK – Under licence from Serge Tcherepnin

“Serge Modular” is an analogue modular synthesizer system developed by French composer and electronic designer Serge Tcherepnin in the 1970s at The California Institute of the Arts. Serge’s vision to create a “people’s synthesizers” led to a unique modular music system with an iconic design.

In collaboration with and under licence from Serge Tcherepnin, Random*Source offers a range of Serge modules, combining the original Serge circuits with the advantages of today’s technology. The modules on this page are in Eurorack (3U) format – modules in the classic Serge dimension (“4U” panel height) and the typical banana jacks can be found here.

SERGE VARIABLE RESONANCE FILTER (VCFQ)

The Serge Extended Variable Resonance filter (VCFQ) is probably the most famous filter of the Serge system and one of the essential Serge modules. It is an excellent, extremely versatile general-purpose VCF that provides simultaneous low-pass, high-pass, band-pass and notch (band-reject) outputs combined with unique flexibility. Its trigger in, LOW mode and self osciallation allow a variety of uses from Oscillator to VC processing.

Now – for the first time ever and licenced by Serge – the VCFQ is available as DIY kit for Euro.

Build documentation: Serge VCFQ BOM / Build doc

Thonk Kit Build Notes: Here

Some details of the Random*Source Serge VCFQ module kit:

• Under licence from Serge Tcherepnin
• Designed for High-end VCAs (THAT2180)
• No matching of transistors required
• No wiring needed
• Eurorack format (3U), 14 hp
• Power consumption: 52mA @ +12V, 52mA @ -12V
• Module depth: < 40mm (1.5″)

ALSO CHECK OUT THE NEW MUTANT HOT GLUE KITS HERE!

The Hexinverter.net Mutant Drums range are partial DIY Kits which currently consists of:

• Bassdrum – Mutant 808 Kick
• HiHat – Mutant 808 Hihats
• Clap – Mutant 909 Clap

The Mutant drums are modern hi-fidelity mutants of old classics with extensive CV control capabilities.

If you want a demo of the places the Bassdrum and HiHats can go, you can’t do much better than to check Surgeons recent live Modular Boiler room set which has heavy use of both.

Knobs are not included. We stock the suggested knobs for these Panels here -> white 1900h type.

The Clap set includes 6 items:

1. Metalphoto 2 colour Aluminium Panel
2. PCB set (3 boards)
3. Two 4006 IC Chips
4. All long pin female headers required

All other parts to be sourced by customer – Clap BOM and build notes here

The Bassdrum set includes 4 items:

1. Metalphoto 2 colour Aluminium Panel
2. PCB set (2 boards)
3. All Vactrols required
4. All long pin female headers required

All other parts to be sourced by customer – Bassdrum Mouser BOM and build notes here

The Hihats set includes 6 items:

1. Metalphoto 2 colour Aluminium Panel
2. PCB set (3 boards)
3. All Vactrols required
4. All long pin female headers required

All other parts to be sourced by customer – Hi-Hat BOM and build notes here

Clap Primary Features

Just like the other Mutant Drums, the Clap is a highly versatile module. It is actually a voltage controlled LFSR noise oscillator as well as a powerful percussion synthesis engine!

• Feature-rich, analogue handclap percussion synthesis reminiscent of the 909
• Pitch control of noise generator means you can create everything from vanilla 909 claps to broken, chiptune-like alien sounds
• Doubles as a voltage controlled, Commodore64-sounding noise VCO via the NOISE output and PITCH CV input
• SUSTAIN control lets you crank up the clap’s sustain and use the module as an abstract synth voice with external inputs!
• External input allows you to synthesise claps from virtually any sound source you plug in
• Built in internal reverb effect derived from clap tone
• Reverb decay forms the decay of the clap sound, and is fully voltage controllable from short reverb “snaps” to long, whooshing tails!
• You can select between internal and external noise sources as the source for the reverb sound generation, opening up really interesting sounds
• DRIVE control lets you dial in anything from clean to extremely overdriven sounds
• Bandpass filter cutoff control

Bassdrum Primary Features

It’s really two modules in one: a totally unique analogue bassdrum and a voltage controlled distortion module! (with the same topology as batteryACID!)

• analogue bassdrum circuitry capable of vanilla TR-808 sounds
• built in voltage controlled distortion (batteryACID distortion)
• distortion accepts external inputs when not being used with kick drum (great for acid synth leads)
• voltage control of distortion amount
• voltage control of decay from short kicks to long “ooooooooomphs”
• voltage control of pitch (approximates v/oct response, but not musically tuned)
• non-invasive analogue optocouplers used for voltage control, thus, completely vintage sounds can still be had if that’s what you’re after!
• completely redesigned, hi-fi signal chain spares no expense by replacing cheap transistor amplifiers with low noise opamp equivalents
• you can dial in super hot, modular level output levels (up to 20Vp-p!)

Hihats Primary Features

While the internal noise generator is based on the metallic noise generator in the 808, you can plug virtually ANY sound source into the EXT input and make all sorts of cool hihats!

• analogue hihat circuitry capable of synthesising vanilla TR-808 open and closed hihat sounds (simultaneously)
• external audio input lets you synthesise hihats from virtually any sound source (Jupiter Storm, vcNOIZ, etc.)
• lo-fidelity original VCAs replaced by OTA-based modern VCAs
• VCA DRIVE control for each hihat allows you to dial in anything from soft metallic hihats to extremely overdriven, crunchy hihats
• Exclusive switch lets you select how the two hihats (open/closed) interact with eachother when triggered at the same time
• cutoff frequency control for internal resonant bandpass filter
• resonant filter can be switched on/off
• modular level mutual accent input (0-5V CV)
• trigger input accepts almost anything as a trigger signal
• non-invasive analogue optocouplers used for voltage control, thus, completely vintage sounds can still be had if that’s what you’re after!
• completely redesigned, hi-fi signal chain spares no expense by replacing cheap transistor amplifiers with low noise opamp and OTA equivalents
• – you can dial in super hot, modular level output levels (up to 20Vp-p!)

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SERGE MODULAR FOR EURORACK – Under licence from Serge Tcherepnin

THIS IS NOT A FULL KIT

The Serge Divide by N Comparator (NCOM) is a rare, much sought-after and very essential Serge module covering a number of functions: comparator, voltage-controlled pulse divider, and voltage-controlled staircase generator.

The ÷N COMPARATOR consists of two sections – a comparator (right side) and a voltage-controlled pulse divider (left side). The ÷N output of the pulse divider sends out a pulse on every N-th comparator pulse where N is a number from 1 to 31. N can be (pre-)set with the divider’s control knob (1 ÷N) and can by changed with a control voltage. The VC knob (attenuator)on the bottom of the left side determines how much effect the control voltage has on “N”. In addition, the divider generates a staircase waveform with N steps. This can be used to produce whole-tone steps when run into the 1V/Oct input of a VCO or as a stepped control voltage to change for instance the cutoff of a filter.

The comparator provides a number of useful “housekeeping functions”: Logical decisions (if the +input is greater than the -input, the output will be high, otherwise low), Level detection (whenever a variable waveform crosses the theshold, a pulse is generated ), Pulse width modulation or Rectifying a waveform (e.g. a sine or triangle wave). (More applications and info in the Build Doc).

Now – for the first time and licenced by Serge – the NCOM is available for Eurorack.

SERGE MODULAR FOR EURORACK – Under licence from Serge Tcherepnin

THIS IS NOT A FULL KIT

“Serge Modular” is an analogue modular synthesizer system developed by French composer and electronic designer Serge Tcherepnin in the 1970s at The California Institute of the Arts. Serge’s vision to create a “people’s synthesizers” led to a unique modular music system with an iconic design.

In collaboration with and under licence from Serge Tcherepnin, Random*Source offers a range of Serge modules, combining the original Serge circuits with the advantages of today’s technology.

A post shared by Zlob Modular (@zlobmodular) on Feb 16, 2017 at 12:37pm PST

The Żłob Modular MiniAtt is a 2hp dual passive summed attenuator. Both channels of the MiniAtt have their own individual outputs and are also normalled to a sum output. The module also features individual toggle switches to turn each channel on or off. Due to the passive design of the module, there is a slightly lower signal out at the sum output than the individual outs. The MiniAtt is a great tool for performing and with DC coupled inputs it can handle CV or audio.

Note: this is a Panel/PCB Set only – for complete kit go here

MiniAtt Build Document – Assembly Guide

Specifications

• Width: 2HP
• Depth: 25mm
• Panel: Aluminium – Black /Red
• Power Consumption: Passive

Penrose is a simple CV quantizer DIY kit for the eurorack format. It takes an incoming continuous CV voltage and converts it to the nearest note in a scale. Active notes can be selected with the 12 buttons. You can use it to tune the output of your analog sequencer, as a semi random melody generator, for fast chiptune arpeggios and much more.

It comes as a complete kit with all needed parts to build it. That includes a multi colour aluminum frontpanel, high quality jacks and illuminated bi-color push buttons.

The project is open source, so the schematic and source code is available.

Specs

Current draw: +12V 60mA | -12V 2.5mA
Width: 6HP Depth: 40mm
CV input voltage: 0-10V
CV output voltage: 0-10V

More information

Manual

Assembly guide

THIS IS A FULL DIY KIT

It contains all components required for a complete build, right down to rack screws and power cable. We selected and used the parts as specced by Random*Source. Random Source have created a step by step build doc for this project

SERGE MODULAR FOR EURORACK – Under licence from Serge Tcherepnin

“Serge Modular” is an analogue modular synthesizer system developed by French composer and electronic designer Serge Tcherepnin in the 1970s at The California Institute of the Arts. Serge’s vision to create a “people’s synthesizers” led to a unique modular music system with an iconic design.

In collaboration with and under licence from Serge Tcherepnin, Random*Source offers a range of Serge modules, combining the original Serge circuits with the advantages of today’s technology. The modules on this page are in Eurorack (3U) format – modules in the classic Serge dimension (“4U” panel height) and the typical banana jacks can be found here.

The Żłob Modular VnIcursal VCA is a 6 channel OTA-based linear VCA in 8HP. All 6 VCAs are routed to a sum output so it can be used as a mixer as well. Each channel can be removed from the sum and used independently by patching a cable into it’s own output. The signal inputs are DC coupled for use with both CV and audio and when CV is inserted into the CV jacks, the pots become attenuators for incoming voltage. The VnIcursal VCA also features PCB offset trimmers for ultra silent operation with zero bleed.

Note: this is a Panel/PCB Set only – for complete kit go here

VnIcursal VCA BOM – Bill of Materials

Specifications

• Width: 8HP
• Max Depth: 35mm
• Panel: Aluminium – Black / Red
• Power Consumption: +55mA, -55mA

The “MSG” (Mini Søund Generatør) is a standalone desktop noise synth whose brain is a small, swappable computer chip (Attiny85). Once your MSG is built you have the opportunity to interchange chips to alter the behaviour of the instrument. This machine feels at home while in the company of other grubby “noise kid” devices – especially cheap delay pedals.  The MSG is for lovers of lofi, drone, noise, paranormal activity, and glitch!

Source code can be downloaded from github and tweaked to your liking free of charge, however, we are also offering a chip expansion pack for those who aren’t quite ready to take the plunge into code.

The MSG PCB ships with the Muskrat chip as default.

The 5 expansion pack chips are: Granular, Wavetable, Phase Distortion, Amplitude Modulation and Frequency Modulation.

MSG Build Guide

MSG BOM

MSG Quickstart Guide

Audio Samples

Features

• Large component spacing for DIY beginners
• Opportunity to swap Attiny85 Chips for alternate functionality
• 1/4” Audio out
• 100K output impedance (to match your guitar amp & pedals )
• Open Source

Specifications

• 9VDC centre negative regulated power supply or (x 1) 9V battery (not included)
• Current Draw: 15MA +9V
• 100K Output Impedance
• PCBDimensions: 51mm X 102mm

The Eurorack Power Breakout is a simple and effective way to get a Eurorack power supply connected to your breadboard. The EPB has footprints for a shrouded header, reverse polarity protection diodes, power filtering capacitors, an onboard voltage regulator, and 4 x switched 3.5mm audio jacks. All of your basic power needs are broken out to a single row male header that plugs directly into your breadboard. In addition to power, the 3.5mm audio jacks allow you to easily patch in and out of your breadboard and connect your homemade circuit to your pre existing Eurorack modules. Say goodbye to nasty alligator clips and sloppy home-brew solutions that constantly pop in and out, we’ve got you covered.

Power Breakout BOM

Power Breakout Schematic

**THONK IS NOT LIABLE FOR ANY DAMAGE CAUSED TO YOURSELF OR YOUR EQUIPMENT WHILE USING THIS PRODUCT. PLEASE MAKE SURE YOU KNOW WHAT YOU ARE DOING BEFORE YOU PURCHASE AND USE THIS PRODUCT. IT IS RECOMMENDED THAT A 1K SERIES RESISTOR IS PLACED BETWEEN THE OUTPUT OF YOUR CIRCUIT AND THE 3.5MM JACKS WHEN PLUGGING INTO PRE-EXISTING MODULES – THIS IS FOR CURRENT LIMITING PURPOSES AND MAY POTENTIALLY SAVE YOU FROM BLOWING STUFF UP. WHEN TAKING A SIGNAL FROM YOUR EURORACK INTO THIS CIRCUIT, IT IS RECOMMENDED THAT YOU CONNECT A 100K TERMINATING RESISTOR TO GROUND – THIS IS ALSO FOR CURRENT LIMITING PURPOSES AND MAY POTENTIALLY SAVE YOU FROM BLOWING STUFF UP.

This is a Panel / PCB set that comes with one tapehead, if you want to also DIY a ‘wand’ as shown in the video above (recommended) then we advise you buy an extra tapehead by changing the number from ‘1’ to ‘2’ above. The Tapehead mounted into the module itself is of limited use compared to a wand. We will have a build guide showing you how to turn an old guitar cable into a wand soon.

With a mono cassette head in the panel and a NAB equalised amplifier circuit, Magnetophon is a cassette player without the transport mechanism. Try rubbing old cassette tapes on the panel, or attach a head on a wire to recreate Nam June Paik’s Random Access or Laurie Anderson’s Tape-Bow Violin.

This is a full kit, you just need to provide the tools and solder. We include high quality Op-amps as specced by the designer and also went the extra mile by including 25 0.1% precision resistors to maintain an accurate stereo image during the matrix and de-matrix processes.

The LRMSMSLR brings the power of mid/side processing to the world of Eurorack. Mid/side processing is a powerful tool often utilised in mastering studios; it takes a stereo signal and separates it into the mid and side elements, allowing you to independently process them and then recombine them into a stereo signal.

Used creatively this allows a sound designer to do anything from using two filters with differing responses on a stereo signal without having to perfectly match them for a balanced stereo response, to using a VCA to modulate the stereo width at audio rates to add harmonics to a stereo signal, to techniques which haven’t even been invented yet. The outputs are DC coupled so the LRMSMSLR can be used to get a sum and difference from two CV signals to create complex dynamic CV signals from plain old LFOs and envelopes.

LRMSMSLR has two four inputs and four outputs in the following order:

• Left & Right signal in
• Mid & Side signal out
• Mid & Side signal in
• Left & Right signal out

The Mid out is half-normalled to the Mid in, as is the Side out to the Side in. This means Left and Right in and out can be patched in, passing the stereo signal through unaltered to the Left and Right outs until the Mid and Side inputs are patched in. This allows you to AB any processing by simply pulling out the jacks on the MS inputs.

The LRMSMSLR uses high quality low noise opamps throughout for studio quality sound.

Schematic and discussion of this design: https://www.muffwiggler.com/forum/viewtopic.php?t=142881

This project has surface mount electronics (SMD)

No Parts are provided.

The Bufftest is an extremely accurate buffered mult with a clever little circuit that lets you turn it into a cable tester at the push of a button. It can also be patched as 3x manual gates and, if you can find a use for it, 3x negative gates. Bi-colour LEDs indicate voltage.

To use as a cable tester, patch cable to be tested from any of the top outputs to the bottom input. When the test button is pressed the top LED will light green to indicate a positive voltage output, the bottom LED will indicate the state of the cable being tested. Green indicates the signal is good, red indicates the signal is broken and off indicates signal and ground are shorted.

Following user feedback from the LRMSMSLR the BuffTest has a footprint for a shrouded power header. Reverse power protection is provided by a pair of diodes.

Front panel is PCB material with black soldermask and ENIG gold lettering. Secondary labelling is printed in the copper under the soldermask so it looks embossed. Also lightning bolts.

• 13 mA +12V
• 13 mA -12V
• 0 mA 5V
• 25 mm Depth
• Ø 5.00 (1 Votes) Average Rating

Schematic, BOM and discussion of the design:

https://www.muffwiggler.com/forum/viewtopic.php?t=158717

THIS IS A FULL DIY KIT

It contains all components required for a complete build, right down to rack screws and power cable. We selected and used the parts as specced by Random*Source. Random Source have created a step by step build doc for this project

SERGE MODULAR FOR EURORACK – Under licence from Serge Tcherepnin

“Serge Modular” is an analogue modular synthesizer system developed by French composer and electronic designer Serge Tcherepnin in the 1970s at The California Institute of the Arts. Serge’s vision to create a “people’s synthesizers” led to a unique modular music system with an iconic design.

In collaboration with and under licence from Serge Tcherepnin, Random*Source offers a range of Serge modules, combining the original Serge circuits with the advantages of today’s technology. The modules on this page are in Eurorack (3U) format – modules in the classic Serge dimension (“4U” panel height) and the typical banana jacks can be found here.

A PCB and Baseplate to build the Music Thing Modular Axocontrol add-on for the Axoloti.

The BOM can be found here

The Axoloti Core must be sourced directly from Axoloti.

Tom Whitwell from Music Thing Modular writes:

Axoloti is a very nice €65 audio board from Belgium, the closest thing I’ve yet seen to an Audio Arduino; lots of easy analog ins and outs for pots and switches, enough power to do interesting audio, and a nice visual patching system. A bit like a Nord Modular for 2016.

I’ve put together a simple control surface for my Axoloti; pots, buttons, LEDs and a joystick.

The BOM and PCB files (with a link to OSHPark to buy the PCBs direct) is here on Github: Axoloti Control Board.

It is all CC-BY-SA licensed so feel free to make and sell boards, so long as you credit me (Tom Whitwell / Music Thing Modular) and share any changes/improvements you make to the design.

Here’s a demo video showing a little Echophon/pitch shift patch – it can also happily play the .raw files from the Music Thing SD card.

View more videos here.

Axocontrol BUILD DOCUMENTS and test patch

https://www.thonk.co.uk/documents/axocontrol/

https://github.com/TomWhitwell/Axo-control

Axoloti general info

Sketching digital audio algorithms with the musical playability of standalone hardware.

The Axoloti Patcher offers a “patcher” environment similar to Max/MSP, Pure Data or Reaktor.

The patches run on a standalone powerful microcontroller board : Axoloti Core.

Check some examples of what it is up to.

Visit or join the community forum.

Current source code is on GitHub, latest release can be found here.

THIS IS A FULL DIY KIT

It contains all components required for a complete build, right down to rack screws and power cable. We selected and used the high quality parts as specced by Random*Source.

Most of the components are already soldered! The back board is already fully populated and soldered with SMD components, this is therefore a very quick build that mainly requires soldering of pots, jacks, trimmers, LEDs and headers.

SERGE MODULAR FOR EURORACK – Under licence from Serge Tcherepnin

“Serge Modular” is an analogue modular synthesizer system developed by French composer and electronic designer Serge Tcherepnin in the 1970s at The California Institute of the Arts. Serge’s vision to create a “people’s synthesizers” led to a unique modular music system with an iconic design.

In collaboration with and under licence from Serge Tcherepnin, Random*Source offers a range of Serge modules, combining the original Serge circuits with the advantages of today’s technology. The modules on this page are in Eurorack (3U) format – modules in the classic Serge dimension (“4U” panel height) and the typical banana jacks can be found here.

We’ve been waiting patiently for some versatile logic options in Eurorack DIY and then three come along at once!

This comprehensive suite of Logic modules will have you creating complex rhythmic patterns in no time at all and allow you to inter-modulate your clock and sequencer modules at yet deeper and mysterious levels!

Discrete transistor XNOR/XOR/NOT logic gate

Discrete XNOR/XOR, XOR and NOT gates.

The resistor-transistor based circuit design gives the module some interesting quirks thanks to the transistors thresholds and tolerances when playing around with different amplitudes, waveforms and frequency rates of the incoming signals, making it fun and useful to explore beyond typical logic gating duties, for example as an audio waveshaper/distortion.

It can be patched as two NOT gates and one 2-input XOR gate,
one NOT gate, one 2-input XOR gate and one 2-input XNOR/XOR gate,
two 2-input XNOR/XOR gates
or one NOT gate and one 3-input XNOR/XOR gate.

Gate one and two has two inputs, the third has one. The XOR out from gate one is being normalled to input 1 on gate two. The XOR out from gate two is being normalled to the single input on gate three (NOT).

Dual discrete transistor NOR/OR logic gate

Two discrete NOR/OR logic gates.

The resistor-transistor based circuit design gives the module some interesting quirks thanks to the transistors thresholds and tolerances when playing around with different amplitudes, waveforms and frequency rates of the incoming signals, making it fun and useful to explore beyond typical logic gating duties, for example as an audio waveshaper/distortion.

It can be patched as two NOT gates,
one NOT gate and one 2- or 3-input NOR/OR gate,
one 2-input NOR/OR gate and one 2- or 3-input NOR/OR gate
or one 4-input NOR/OR gate.

Gate one has three inputs, the second has two. The OR out from gate one is being normalled to input 1 on gate two.

Dual discrete transistor NAND/AND logic gate

Two discrete NAND/AND logic gates.

The resistor-transistor based circuit design gives the module some interesting quirks thanks to the transistors thresholds and tolerances when playing around with different amplitudes, waveforms and frequency rates of the incoming signals, making it fun and useful to explore beyond typical logic gating duties, for example as an audio waveshaper/distortion.

It can be patched as two NOT gates,
one NOT gate and one 2- or 3-input NAND/AND gate,
one 2-input NAND/AND gate and one 2- or 3-input NAND/AND gate
or one 4-input NAND/AND gate.

Gate one has three inputs, the second has two. The inputs on gate one is normalled in a 1>2>3 fashion for efficient cable and time-saving patching. The inputs on gate two has also been normalled 1>2, with the AND out from gate one in turn being normalled to input 1 on gate two.

Build documents and BOMs here – http://ljunggrenaudio.com/products/boolean%20logic.html

A simple and space-efficient voltage controlled amplifier for processing of control voltages as well as audio with high precision and a good clean sound.

This module gives you no less than three fully independant linear VCAs with very similar response between each VCA in the same module or between modules.

The 3xVCA is great for adding extra life and dynamics to CV modulations as well as for regular audio duties such as a good sounding Amplitude Modulation all the way thru the audio spectrum.

This module requires calibration in several steps, achieved precision depends on the precision of your multimeter. It can be calibrated for either 5V or 8V CV. Assembled modules are calibrated to 1.00x gain at 5.00V CV, that means 8.00V CV will give a 1.65x gain.

Kits comes supplied with PCB, front panel (PCB material), component kit, power cable and mounting screws. Solder and tools are not supplied.

Download BOM and calibration instructions here.

Download schematics here.

 Basic specifications

Width: 4hp

Depth: 51 mm.

Power: +12V 26 mA / -12V 21mA