5U MFOS Synth Modules

A bare PCB for the MFOS Voltage Controlled Oscillator which allows use of SOIC or DIP8 SSM2210 or SSM2212 dual NPN package or discrete matched NPN pair.  Years of MFOS VCO improvements all rolled into this design. Good tracking over several octaves (6 to 8). Can be temperature compensated with a metal film 2K Ohm 1/4W +/-2% T.C. +3300 PPM tempco. Simultaneous Rectangle, Ramp, Triangle and Sine Outputs (Ramp core design) Designed for 1V/Octave control voltage 4 1V/Octave control voltage inputs. 1 Linear control voltage input. Hard sync input. Rectangle wave duty cycle adjustable between 10% and 90% Rectangle wave duty cycle voltage controllable Frequency range is from sub audible (approximately 0.1 hertz) to ultra-sonic 20kHz. Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Voltage Controller Low Frequency Oscillator.  Simultaneous Sine, Triangle, Saw, Ramp, and Variable Pulse Width Rectangle Outputs. Voltage Control of Frequency (approximate log response, NOT 1V/Octave) Voltage Control of Rectangle Pulse Width Fine and Coarse Frequency Control Very Low Frequency (1 Cycle per several minutes) Output levels are all approximately +/-5V (+ or - 300 mV). Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB 140x88mm for the MFOS Voltage Controlled 24dB Low Pass Filter. Four Pole 24dB Per Octave Low Pass Filter Log Response to Control Voltage (1V/Oct Tunable) Makes A Nice Sine Wave Oscillator Power Supply Range +/-9V up to +/-15V Voltage Controlled Cut-Off Frequency Voltage Controlled Resonance Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Voltage Controlled State Variable 12dB Filter with high pass, low pass and band pass outputs. State Variable VCF 12dB/Octave With VC Resonance Simultaneous High-Pass, Low-Pass and Band Pass Filter outputs. Log Response to Control Voltage (1V/Oct Tuneable) Sine Wave Oscillator at full resonance Power Supply Range +/-9V up to +/-15V Voltage Controlled Resonance (Linear control) Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Quad Timbre Bank. Four complete 12dB/Oct VCFs (linear CV response) Four complete VCAs (linear CV response) Three Filters: Band-Pass/Low Pass Selectable One Filter: Band-Pass/High Pass Selectable (Low-pass output available) Board supports use in several configurations All filters resonant & sine capable Supports Percussion Synth possibilities Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Vocoder project. A vocoder has got to be one of the coolest signal processors going. It allows you to impress vocal harmonic and dynamic characteristics onto other sound sources making them sound as if they are talking. This vocoder design works by using one lo-pass filter (100 Hz.), ten successively tuned band-pass filters (154, 208, 285, 395, 542, 720, 1013, 1495, 2000, 2546 Hz.) and one hi-pass filter (3330 Hz.) to separate the incoming control signal into its harmonic constituents. For each band the control signal appearing at the output of its corresponding filter is full wave rectified and low pass filtered to obtain the control signal's envelope voltage. This signal is used to drive a VCA through which the channel's filtered audio is amplitude controlled. Features Built in White/Pink Noise Source Built in Square/Pulse Oscillator Mic/Line Inputs for Control and Audio Good Dynamic Response To Voice Control Reasonably Intelligible Speech Processing Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Dual Log / Lin Voltage Controlled Amplifier. Log and Linear Response to Control Voltage DC Coupling Throughout Excellent for Ring Modulation Effects Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Attack, Decay, Sustain , Release (ADSR) Envelope Generator. 1 mS to 20 second Attack, Decay, and Release times. Classic ADSR envelope shape and functionality. Gate and trigger inputs permit retrigger after Attack complete. Comparators on gate and trigger inputs. Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Dual Attack Release (AR) Envelope Generators. Two separate Attack Release Envelope Generators on one PC board. Each EG has its own repeat function. Gated mode provides classic AR response. Triggered mode provides AD response. Retriggerable as soon as the attack cycle completes. Attack and release times from 1 mS to 20 seconds. Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Seven Segment Envelope Generator project. Features Selectable Two to Seven Linear Envelope Segments Positive and Negative Slopes Triggered Mode Supports Sustain Segments Gate Mode 1: Complete Envelope on Gate Release. Gate Mode 2: Reset Envelope on Gate Release. Level and Polarity Output Control Two millisecond to several minutes long segment times. Slope runaway detect and reset. Envelope Repeat Manual Gate LEDs Identify Active Segment Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Delayed Modulation modules that includes an AR envelop generator, LFO with sine and square waveforms and a VCA configured as a delayed modulation patch. Frees up an envelope generator, LFO, and VCA. LFO has sine and square (triangle available) outputs. LFO frequency range 1.5 Hz to 500 Hz. Design provides lots of modulation options. Gated or triggered mode and full AR generator included. Sine, Triangle and Square modulation sources. Possibilities for use as a drum voice. PCB has LFO and AR generator outputs available. High and Low output ranges. Low chip count. Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Micro Sample and Hold module. Features: Variable sample rate Output voltage glide (portamento) Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Sample and Hold module with the addition of a voltage controlled clock that triggers samples. Sample Rates from .05Hz to 1kHz. Voltage Controlled Sample Clock Clock Sync-In Can Double As External Clock In Glide Control To Slew Between Samples. Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Sub-Commander Guitar Synth. This Guitar Synth buffers your guitar's signal, creates a pulse waveform (at the same frequency as the guitar) divides it's frequency in half (sub-octave generator) and generates a gate when you pluck a string so you can control the SUB-COMMANDER's AR generators. It permits you to mix the sub-octave, original signal and pulse signal and then route them through the SUB-COMMANDER's VCF and VCA. By doing this you can generate some very cool synthesizer-like sounds and effects for your electric guitar.  This is not to be compared with units that require a hex pickup and special processing to drive frequency to voltage convertors or MIDI controllers. Features Generates sub-octave and pulse waveforms Generates gate and trigger signals VCF controlled by dedicated AD generator and LFO VCA controlled by dedicated AD generator and LFO Mix clean sound with filtered/modulated sound. Auto-Wah, Warbling Wah, Tremolo, Pseudo-Ring Mod Gives your guitar a bag of new tricks Advanced project for advanced electronics hobbyists Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Multi-Function Module which features a great assortment of functions in one module. Two 3 input DC voltage mixers with normal and inverted output A linear lag processor A RC lag processor A LED voltage level meter. Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Stereo Auto Panner that pans the input signal back and forth between the left and right channels. Leslie Spin-up/Spin-down Simulator Included on PCB Mimics the Rhodes Stage Piano stereo tremolo Power supply can be +/-12 or +/-15 volts. Easily obtainable parts. CV Control of Panning Rate. Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Stereo Panning Mixer that features: Four mono input channels each with Panning, Effect 1 Send and Effect 2 Send. Effect 1 and Effect 2 return can be used as additional stereo line inputs. Two stereo line inputs. Stereo Line Out Integral Stereo Headphone Amp Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Noise Generator that features: White Noise. Pink-ish Noise High Pass Noise Adjustable Grainy Noise. Adjustable Random Gates. Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Voltage Quantizer that converts a varying voltage input into discrete chromatic scale steps and features: Converts continuous voltage input to discrete .0833 voltage steps. Also provides whole step and fourths mode (.1666V and .3332V steps). Low cost parts used in the A/D and D/A circuits. Adds 12 tone (or whole or fourth tone) musical dimension to S&H outputs. Eases sequencer set up by correcting notes to discrete steps. Conversion time varies from sub millisecond to 1.26 millisecond (full count) Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the old-school, vintage style single buss 1V/octave keyboard controller. As a normal keyboard all you need is an old organ keyboard that has one switch per key that closes to a common buss. Or you can modify an old piano keyboard section with reed switches and magnets to make you own keyboard. Or mount reed switches on yourself or whatever and make a really cool looking controller that you play with magnets glued to your fingers for your next performance art gig. As long as you have a series of resistors with switches to close the junctions to a common bus you have a controller that can use this circuit to sample and hold key presses. Features One Volt Per Octave Keyboard Controller Requires Only Single Buss Keyboard (or other single switch per note mechanism) Four CV outputs Two Outputs With Glide Trigger and Gate Outputs LED Drive For Gate And Trigger Indicators Great For Performance Art projects A True Classic Analog Synth Design Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS CV & Gate Expander module. Once you start building up your modular you quickly learn that you need a lot of CV outputs to drive all of those VCOs, VCAs and VCFs. Additionally you never seem to have enough gates to drive all of the envelope generators, sequencers, and other modules that require them. That's where the MFOS CV and Gate Expander comes in. One CV input can drive 8 buffered CV outputs or two CV inputs can each drive four buffered CV outputs. Three of the CV outputs have portamento (glide). The gate input can drive 6 buffered gate outputs. Three of the gate outputs are op-amp drive and three of them are CMOS drive. The CV output is zener limited to provide protection from over-voltage. The gate output voltage levels are all customisable. Features Expand one CV input to eight CV outputs. Expand two CV inputs to two sets of four CV outputs. Three CV outputs have adjustable portamento. Expand one gate input to six gate outputs. Three gate outputs have adjustable delay (1mS min and 1.8 Sec max). CV and Gate output levels are easily settable. Gate input comparator accepts wide range of input gate level. Zeners limit both pos and neg CV excursions. Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Mini-Keyboard Controller If you are into the synth hobby scene this is a "must have" you will be playing with this thing into the wee hours of the morning especially if you built a Sound Lab and don't already have a keyboard controller or you are planning on building a Sound Lab.  The MFOS Mini-Controller has a twenty nine note stylus keyboard (C - C - C to E) It can be used to play your Sound Lab Mini-Synth or 1V/Oct modular. The MFOS Mini-Controller supports four CV outputs (2 with portamento 2 without portamento) My prototype (shown) only used two. There is one trigger output and one gate output. Just the coolest thing EVER! Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS 8-Stage Phase Shifter that features: Switchable 4 or 8 stage phase shifter. Variable feedback ranges from mild swooshing to raucous mind bending. Two external control voltage inputs. Pseudo stereo output when 4 stage and 8 stage outputs are used. Transconductance amp based phase shift cells. On-Board LFO produces Triangle and Ramp waves. Phase angle is modulated in a logarithmic fashion. 8 Stages of phase shift result in some sweet barber pole effect. Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Ring Modulator that features: Internal sine wave oscillator. Two input channels with gain of 1 to 100. Internal sine x channel two mode Channel one x channel two mode Channel short switch to provide squaring of a single input. Voltage control inputs for internal sine wave oscillator. Sine oscillator output. Make bell like tones. Modify the sound of instrument or vocal. Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Wave Freaker Module that features: Turns a Triangle or Sine Wave Into a Harmonic-Rich Waveform. Provides several waveforms: Inverted Peaks Wave (CV modulation capable) Stepped Wave (CV modulation capable) PWM Rectangle (CV modulation capable) Square Sub-octave of fundamental Square Sub-Sub-octave of fundamental Voltage Controlled Wave Shape Modulation Voltage Controlled Step Wave Modulation Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Voltage Controlled Echo Module. Mic/Line Input (x100 Gain in Mic Mode) Original Signal Volume Control Voltage Controlled Echo Volume Voltage Controlled Feedback (Repeat) Voltage Controlled Echo Delay Buffer Output Useful for General Synth Work Total blast to play with! Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A pair of bare PCBs for the MFOS Wave Former Two to ten step sculptable waveform. Square or sawtooth wave shapes Great source of new timbres Wave rounding (slew) control Great source of modulation Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Voltage Controlled analogue reverb unit Voltage controlled reverb level Voltage controlled original level Supplied without components or instructions, Soundtronics stock all components needed to build these modules. Erratum The official MFOS PCB differs slightly from the instructions / PCB layout on the MFOS website. The VC Reverb was the last product from Ray Wilson before his passing and a few anomalies remain with the PCB. We have identified what we believe are the only differences which are a few components to form a high pass filter R9, R39, R40 & C27. Also C1 and C5 see further down the page.   R40 (100k) is solder on the rear of U1 between pins 3 & 4.   R9 (10k) is soldered to C27 (22nF) before soldering into the R9 position. It is important the resistor and capacitor are soldered exactly as per the photo below. R39 (1k) is soldered from the casing of the phono socket to the junction of R9 and C27.   Finally, D4 is shown as Z2 on the PCB silk screen and with an incorrect orientation. Photo below shows D4 in its correct position.     Gary J from Florida also pointed two other differences that we did not mention in the erratum above which relate to C1 and C5. C1 is a 1uF tantalum capacitor in the schematic and parts list but the PCB silk screen only shows a non-polarised capacitor. C5 on the PCB shows it being polarised but is actually a 100nF non-polarised ceramic capacitor.   When soldering in C1, make sure the +v side of the capacitor is facing towards U1.   The spacing for C5 is too narrow so simply form the leads to suit, it does not matter which way around it is soldered in.   Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Echo Rockit Noise box. Simple 9V Battery Supply External Input with Mic/Line Capability Put external signals through VCF and Echo Resonant Low Pass VCF Doubles as Sine Oscillator External Voltage Control of VCF Cut Off Frequency Echo Effect Processing (Volume, Delay, Repeat) LFO Has Triangle and Square Waves LFO Has Low and High Range LFO Modulates Cut Off Frequency LFO Modulates Echo Delay Time Internal Oscillator for VCF Excitation Exudes Coolness and... Amazingness! Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for perhaps the most popular off all Ray Wilson's designs - the MFOS Noise Toaster. Easy to build Wide Range VCO White Noise Generator Cool low Pass Filter Simple But Effective VCA AR Generator with Repeat or Manual Pushbutton LFO with Square, Integrated Square and Differentiated Square waves Nicely Normalized Switching Scheme PCB Has Pads for Interface to Other DIY Projects Built in One Watt Audio Amplifier and Speaker. Uses one 9V Battery (portable) Low Current Design Extends Battery Life Makes a plethora of plethoras of cool and interesting sounds WILL attract alien visitations - CAUTION ADVISED WILL DEFINITELY cut into TV viewing time - CAUTION ADVISED Stimulates plant growth and calms goldfish. Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Weird Sound Generator. This is a really fun project and it makes a LOT of weird sounds. You will have hours, no at least days... weeks of fun making weird sound after weird sound. You will make at the very least a MILLION weird sounds in the first month alone. Recommended that you use this in conjunction with your hardware or software sampler to provide tons of timbres for you sampling synth. Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Alien Screamer project. Easy to build Uses one 9V battery (portable) Built in amplifier and speaker. Kludge area on PC board (customizations...) Low current design extends battery life Makes a plethora of cool and interesting sounds Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Sound Lab Ultimate project. The MFOS Sound Lab ULTIMATE is simply put, one of the coolest things you will ever build with your own two hands. If you've always wanted to build your own analog electronic music synthesizer, the MFOS Sound Lab ULTIMATE may well be exactly what you've been waiting for. The MFOS Sound Lab ULTIMATE is the completely new single board mono-synth from MFOS with the sickest set of features you'll find on one PC board:   Three Musically Accurate VCOs (sawtooth and variable width rectangular wave forms, pulse width modulation, hard-sync, log and linear CV inputs) VCOs provide plenty of tracking range. Listen to the samples below. White Noise Generator Active Mixer (for VCOs, noise and external input) Voltage Controlled LP Filter (12db/Oct doubles as a sine wave oscillator) Voltage Controlled Amplifier (log response) Attack Release Envelope Generator Two Low Frequency Oscillators (square, ramp, tri and sawtooth waveforms) Repeat Gate Generator (doubles as another square wave LFO) Sample & Hold (with variable sample rate and glide) Attenuator Bank (for an infinite variety of modulation patches) Patch Panel Design (provides infinitely variable combinations of sounds) Sound Lab ULTIMATE "Expander" also available for added flexibility.   Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Sound Lab Expander project. The MFOS Sound Lab ULTIMATE EXPANDER in combination with an MFOS Sound Lab ULTIMATE is a completely full featured modular synthesizer. Although specifically designed to be a companion to the Sound Lab ULTIMATE the ULTIMATE EXPANDER has the features to stand  as a super "on its own Swiss Army Knife" module. The MFOS Sound Lab ULTIMATE EXPANDER includes:  A State Variable Voltage Controlled Filter (doubles as a 1V/oct sine wave oscillator over several octaves) A Voltage Controlled Amplifier (expo response) An ADSR Envelope Generator A Four Channel Active Mixer A One-In Three-Out Voltage Distributor A CV Inverter An Analog Multiplier (Ring Modulator) An External Signal Buffer An Envelope Follower Two Passive Voltage Attenuators A Headphone Amplifier Signal Routing and Buffering for The Sound Lab ULTIMATE Patch Panel Design Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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A bare PCB for the MFOS Sound Lab Mini Synth project. This project is fun for someone with intermediate to advanced electronics skills who wants to make cool sounds. It makes a great first synth project but is interesting enough for the seasoned synth-diyer too. The board includes 1V/oct scale adjustment trimmers for the oscillators You will get a couple (maybe three) octaves of in tune scale. If you have a sampler you can use this unit as an analog synth sound source to make excellent samples with. Some of the wiring is done on the chassis but the drawing included will make it very easy for you to do a neat job while you build it. Supplied without components or instructions. For build instructions see the MFOS website. Soundtronics (Sonic Synths) MFOS Projects are authorized by Music From Outer Space

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