DIY SYNTHESIZER PRojects

I have a lot of designs, to help you find what you're looking for I've sorted them in three different ways:

Analog Vs Digital.
This means whether the project needs a microcontroller or not.

Complexity
This is a general idea of build difficulty, parts count, wiring, etc.

Function/Feature/Etc
Designs listed by their general function or a build feature.

MASTER PROJECT LIST

BMC001 - SIMPLE CV QUANTIZER.
BMC003 - CV ARPEGGIATOR
BMC004 - VC MASTER CLOCK/DIVIDER
BMC006 - VOLTAGE TO RHYTHM CONVERTER
BMC008 - MULTI-WINDOW COMPARATOR
BMC009 - USER WRITABLE QUANTIZER
BMC010 - DUAL DECAYING NOISE
BMC011 - WAVE ANIMATOR
BMC012 - STEPPED CV GENERATOR
BMC013 - RANDOM RESONATOR
BMC014 - GATE DELAY/LOOPER
BMC015 - VCA/MIXER
BMC016 - DUAL NICE QUANTIZER
BMC017 - 2LFO SH
BMC018 - ANALOG DRUM
BMC019 - DELAYING AR
BMC020 - 1SONG
BMC021 - FULL WAVE DUAL RECTIFIER
BMC022 - AUTOMATED SEQUENCER
BMC023 - DECAYING ANALOG NOISE T
BMC024 - MIDI TO GATE CONVERTER
BMC025 - FM DRUM
BMC026 - RANDO CHORDO
BMC027 - RANDOM RHYTHMS
BMC028 – LIVE RHYTHM QUANTIZER
BMC029 – SINGLE MULTIPLIER/DIVIDER
BMC030 – GUITAR INPUT
BMC031 – QTLFO
BMC032 - BLENDED BANDPASS
BMC033 - 4046 SHAPER
BMC034 - SWITCHED RESISTOR VCF
BMC035 - BYTEWISE OPERATOR
BMC036 - DIGITAL HI HAT
BMC037 - EURORACK BUFFER
BMC038 - PANEL KEYBOARD
BMC039 - STEP RHYTHM
BMC040 - DUAL LOGIC
BMC041 - CV SPREADER
BMC042 - SIMPLE AR
BMC043 - 4X DECAY
BMC044 - 4 KNOB SEQUENCER
BMC045 - PROGRAMMABLE ROUTER
BMC046 - DIGITAL NOISE
BMC047 - BALANCED OUTPUTS
BMC048 - SINGLE RANDOM RHYTHM
BMC049 - ATTENUVERTING MIXER
BMC050 - MANUAL VOLTAGES
BMC051 - PRESET RHYTHMS
BMC052 - CHORDIZER
BMC053 - FOUR QUADRANT MULTIPLIER AND PANNER
BMC054 - STEREO OUTPUT
BMC055 - SALLEN-KEY VCF
BMC056 - Utility Buttons
BMC057 - GATED SLEW
BMC058 - YES NO MAYBE
BMC059 - MULTI PWM
BMC060 - TOGGLE QUANTIZER
BMC061 - VC MULTIPLEXER
BMC062 - SIMPLE BLEND
BMC063 - 4HP BINARY COUNTER / DIVIDER
BMC064 - 4HP DECADE COUNTER
BMC065 - 4HP 3IN 4OUT LOGIC GATES
BMC066 - 4HP 2X3 Buffer
BMC067 - 4HP Quad Voltage Inverter
BMC068 - 4HP UNITY MIXER
BMC069 - 4HP GATE TO TRIGGER CONVERTER
BMC070 - TRIGGER TO GATE CONVERTER
BMC071 - 4HP DUAL SR LATCH
BMC072 - 4HP 4IN 3OUT LOGIC GATES
BMC073 - 4 KNOB DUAL DECAYING NOISE
BMC074 - ATTENUATE OFFSET INVERT
BMC075 - ENVELOPE FOLLOWER
BMC076 - 4HP COMMON INPUT LOGIC GATES
BMC077 - 4HP PARALLEL DAC
BMC078 - INFRARED INPUT
BMC079 - RISE FALL DETECTOR
BMC080 - DIODE LOW PASS FILTER
BMC081 - 4HP GATE INVERTER
BMC082 - 4HP TRIANGLE FREQUENCY DOUBLER
BMC083 - VC DELAY
BMC084 - 2 CH VOLTAGE TO RHYTHM
BMC085 - 2X VC LFO
BMC086 - DIODE HIGH PASS FILTER
BMC087 - VC RELEASE

ANALOG PROJECTS

BMC011 - WAVE ANIMATOR
BMC015 - VCA/MIXER
BMC017 - 2LFO SH
BMC018 - ANALOG DRUM
BMC021 - FULL WAVE DUAL RECTIFIER
BMC023 - DECAYING ANALOG NOISE T
BMC025 - FM DRUM
BMC030 – GUITAR INPUT
BMC031 – QTLFO
BMC032 - BLENDED BANDPASS
BMC033 - 4046 SHAPER
BMC034 - SWITCHED RESISTOR VCF
BMC037 - EURORACK BUFFER
BMC041 - CV SPREADER
BMC043 - 4X DECAY
BMC047 - BALANCED OUTPUTS
BMC049 - ATTENUVERTING MIXER
BMC050 - MANUAL VOLTAGES
BMC053 - FOUR QUADRANT MULTIPLIER AND PANNER
BMC054 - STEREO OUTPUT
BMC055 - SALLEN-KEY VCF
BMC057 - GATED SLEW
BMC059 - MULTI PWM
BMC062 - SIMPLE BLEND
BMC063 - 4HP BINARY COUNTER / DIVIDER
BMC064 - 4HP DECADE COUNTER
BMC065 - 4HP 3IN 4OUT LOGIC GATES
BMC066 - 4HP 2X3 Buffer
BMC067 - 4HP Quad Voltage Inverter
BMC068 - 4HP UNITY MIXER
BMC069 - 4HP GATE TO TRIGGER CONVERTER
BMC070 - TRIGGER TO GATE CONVERTER
BMC071 - 4HP DUAL SR LATCH
BMC072 - 4HP 4IN 3OUT LOGIC GATES
BMC074 - ATTENUATE OFFSET INVERT
BMC075 - ENVELOPE FOLLOWER
BMC076 - 4HP COMMON INPUT LOGIC GATES
BMC077 - 4HP PARALLEL DAC
BMC078 - INFRARED INPUT
BMC079 - RISE FALL DETECTOR
BMC080 - DIODE LOW PASS FILTER
BMC081 - 4HP GATE INVERTER
BMC082 - 4HP TRIANGLE FREQUENCY DOUBLER
BMC083 - VC DELAY
BMC085 - 2X VC LFO
BMC086 - DIODE HIGH PASS FILTER
BMC087 - VC RELEASE

Digital projects

BMC001 - SIMPLE CV QUANTIZER.
BMC003 - CV ARPEGGIATOR
BMC004 - VC MASTER CLOCK/DIVIDER
BMC006 - VOLTAGE TO RHYTHM CONVERTER
BMC008 - MULTI-WINDOW COMPARATOR
BMC009 - USER WRITABLE QUANTIZER
BMC010 - DUAL DECAYING NOISE
BMC012 - STEPPED CV GENERATOR
BMC013 - RANDOM RESONATOR
BMC014 - GATE DELAY/LOOPER
BMC016 - DUAL NICE QUANTIZER
BMC019 - DELAYING AR
BMC020 - 1SONG
BMC022 - AUTOMATED SEQUENCER
BMC024 - MIDI TO GATE CONVERTER
BMC026 - RANDO CHORDO
BMC027 - RANDOM RHYTHMS
BMC028 – LIVE RHYTHM QUANTIZER
BMC029 – SINGLE MULTIPLIER/DIVIDER
BMC035 - BYTEWISE OPERATOR
BMC036 - DIGITAL HI HAT
BMC038 - PANEL KEYBOARD
BMC039 - STEP RHYTHM
BMC040 - DUAL LOGIC
BMC042 - SIMPLE AR
BMC044 - 4 KNOB SEQUENCER
BMC045 - PROGRAMMABLE ROUTER
BMC046 - DIGITAL NOISE
BMC048 - SINGLE RANDOM RHYTHM
BMC051 - PRESET RHYTHMS
BMC052 - CHORDIZER
BMC056 - Utility Buttons
BMC058 - YES NO MAYBE
BMC060 - TOGGLE QUANTIZER
BMC061 - VC MULTIPLEXER
BMC073 - 4 KNOB DUAL DECAYING NOISE
BMC084 - 2 CH Voltage To Rhythm

Simple complexity


These projects have low parts counts, are easy to wire and require no calibration.

BMC001 - SIMPLE CV QUANTIZER.
BMC011 - WAVE ANIMATOR
BMC018 - ANALOG DRUM
BMC023 - DECAYING ANALOG NOISE T
BMC029 – SINGLE MULTIPLIER/DIVIDER
BMC031 – QTLFO
BMC032 - BLENDED BANDPASS
BMC037 - EURORACK BUFFER
BMC040 - DUAL LOGIC
BMC041 - CV SPREADER
BMC042 - SIMPLE AR
BMC046 - DIGITAL NOISE
BMC048 - SINGLE RANDOM RHYTHM
BMC049 - ATTENUVERTING MIXER
BMC050 - MANUAL VOLTAGES
BMC057 - GATED SLEW
BMC062 - SIMPLE BLEND
BMC063 - 4HP BINARY COUNTER / DIVIDER
BMC064 - 4HP DECADE COUNTER
BMC065 - 4HP 3IN 4OUT LOGIC GATES
BMC066 - 4HP 2X3 Buffer
BMC067 - 4HP Quad Voltage Inverter
BMC068 - 4HP UNITY MIXER
BMC069 - 4HP GATE TO TRIGGER CONVERTER
BMC070 - TRIGGER TO GATE CONVERTER
BMC071 - 4HP DUAL SR LATCH
BMC072 - 4HP 4IN 3OUT LOGIC GATES
BMC074 - ATTENUATE OFFSET INVERT
BMC076 - 4HP COMMON INPUT LOGIC GATES
BMC079 - RISE FALL DETECTOR
BMC081 - 4HP GATE INVERTER
BMC082 - 4HP TRIANGLE FREQUENCY DOUBLER

Standard complexity


These projects have higher parts counts, more complex wiring and may require some calibration.

BMC003 - CV ARPEGGIATOR
BMC010 - DUAL DECAYING NOISE
BMC013 - RANDOM RESONATOR
BMC014 - GATE DELAY/LOOPER
BMC017 - 2LFO SH
BMC019 - DELAYING AR
BMC020 - 1SONG
BMC021 - FULL WAVE DUAL RECTIFIER
BMC022 - AUTOMATED SEQUENCER
BMC024 - MIDI TO GATE CONVERTER
BMC025 - FM DRUM
BMC028 – LIVE RHYTHM QUANTIZER
BMC030 – GUITAR INPUT
BMC033 - 4046 SHAPER
BMC034 - SWITCHED RESISTOR VCF
BMC035 - BYTEWISE OPERATOR
BMC036 - DIGITAL HI HAT
BMC038 - PANEL KEYBOARD
BMC039 - STEP RHYTHM
BMC043 - 4X DECAY
BMC044 - 4 KNOB SEQUENCER
BMC047 - BALANCED OUTPUTS
BMC051 - PRESET RHYTHMS
BMC053 - FOUR QUADRANT MULTIPLIER AND PANNER
BMC054 - STEREO OUTPUT
BMC055 - SALLEN-KEY VCF
BMC056 - Utility Buttons
BMC059 - MULTI PWM
BMC060 - TOGGLE QUANTIZER
BMC061 - VC MULTIPLEXER
BMC073 - 4 KNOB DUAL DECAYING NOISE
BMC075 - ENVELOPE FOLLOWER
BMC077 - 4HP PARALLEL DAC
BMC078 - INFRARED INPUT
BMC080 - DIODE LOW PASS FILTER
BMC083 - VC DELAY
BMC084 - 2 CH Voltage To Rhythm
BMC085 - 2X VC LFO
BMC086 - DIODE HIGH PASS FILTER
BMC087 - VC RELEASE

Advanced complexity


These projects have high parts counts, require lots of offboard wiring and/or have several trimpots to calibrate.

BMC004 - VC MASTER CLOCK/DIVIDER
BMC006 - VOLTAGE TO RHYTHM CONVERTER
BMC008 - MULTI-WINDOW COMPARATOR
BMC009 - USER WRITABLE QUANTIZER
BMC012 - STEPPED CV GENERATOR
BMC015 - VCA/MIXER
BMC016 - DUAL NICE QUANTIZER
BMC026 - RANDO CHORDO
BMC027 - RANDOM RHYTHMS
BMC045 - PROGRAMMABLE ROUTER
BMC052 - CHORDIZER
BMC058 - YES NO MAYBE

CV Processors


These projects have CV inputs with CV outputs.

BMC015 - VCA/MIXER
BMC001 - SIMPLE CV QUANTIZER.
BMC006 - VOLTAGE TO RHYTHM CONVERTER
BMC008 - MULTI-WINDOW COMPARATOR
BMC009 - USER WRITABLE QUANTIZER
BMC015 - VCA/MIXER
BMC016 - DUAL NICE QUANTIZER
BMC017 - 2LFO SH
BMC019 - DELAYING AR
BMC026 - RANDO CHORDO
BMC035 - BYTEWISE OPERATOR
BMC041 - CV SPREADER
BMC049 - ATTENUVERTING MIXER
BMC052 - CHORDIZER
BMC053 - FOUR QUADRANT MULTIPLIER AND PANNER
BMC057 - GATED SLEW
BMC060 - TOGGLE QUANTIZER
BMC062 - SIMPLE BLEND
BMC067 - 4HP Quad Voltage Inverter
BMC068 - 4HP UNITY MIXER
BMC074 - ATTENUATE OFFSET INVERT

Sequencers and CV Generators


These projects allow the user to create sequences of gates or CVs, or they output a CV.

BMC003 - CV ARPEGGIATOR
BMC006 - VOLTAGE TO RHYTHM CONVERTER
BMC012 - STEPPED CV GENERATOR
BMC017 - 2LFO SH
BMC022 - AUTOMATED SEQUENCER
BMC027 - RANDOM RHYTHMS
BMC031 – QTLFO
BMC039 - STEP RHYTHM
BMC044 - 4 KNOB SEQUENCER
BMC048 - SINGLE RANDOM RHYTHM
BMC051 - PRESET RHYTHMS
BMC058 - YES NO MAYBE
BMC077 - 4HP PARALLEL DAC
BMC084 - 2 CH Voltage To Rhythm
BMC085 - 2X VC LFO

Gate/Clock/Trigger Processors


These projects take a gate, clock or trigger input and output a related gate, clock or trigger.

BMC004 - VC MASTER CLOCK/DIVIDER
BMC014 - GATE DELAY/LOOPER
BMC028 – LIVE RHYTHM QUANTIZER
BMC029 – SINGLE MULTIPLIER/DIVIDER
BMC040 - DUAL LOGIC
BMC063 - 4HP BINARY COUNTER / DIVIDER
BMC064 - 4HP DECADE COUNTER
BMC065 - 4HP 3IN 4OUT LOGIC GATES
BMC069 - 4HP GATE TO TRIGGER CONVERTER
BMC070 - TRIGGER TO GATE CONVERTER
BMC071 - 4HP DUAL SR LATCH
BMC072 - 4HP 4IN 3OUT LOGIC GATES
BMC076 - 4HP COMMON INPUT LOGIC GATES
BMC077 - 4HP PARALLEL DAC
BMC081 - 4HP GATE INVERTER

Gate/Clock/Trigger Generators


These modules output a gate, clock or trigger

BMC003 - CV ARPEGGIATOR
BMC004 - VC MASTER CLOCK/DIVIDER
BMC006 - VOLTAGE TO RHYTHM CONVERTER
BMC014 - GATE DELAY/LOOPER
BMC020 - 1SONG
BMC022 - AUTOMATED SEQUENCER
BMC024 - MIDI TO GATE CONVERTER
BMC027 - RANDOM RHYTHMS
BMC030 – GUITAR INPUT
BMC035 - BYTEWISE OPERATOR
BMC038 - PANEL KEYBOARD
BMC039 - STEP RHYTHM
BMC044 - 4 KNOB SEQUENCER
BMC048 - SINGLE RANDOM RHYTHM
BMC050 - MANUAL VOLTAGES
BMC051 - PRESET RHYTHMS
BMC056 - Utility Buttons
BMC058 - YES NO MAYBE
BMC075 - ENVELOPE FOLLOWER
BMC078 - INFRARED INPUT
BMC079 - RISE FALL DETECTOR
BMC084 - 2 CH Voltage To Rhythm
BMC085 - 2X VC LFO

Signal Converters


These modules convert a signal of one type to another.

BMC006 - VOLTAGE TO RHYTHM CONVERTER
BMC009 - USER WRITABLE QUANTIZER
BMC024 - MIDI TO GATE CONVERTER
BMC030 – GUITAR INPUT
BMC069 - 4HP GATE TO TRIGGER CONVERTER
BMC070 - TRIGGER TO GATE CONVERTER
BMC075 - ENVELOPE FOLLOWER
BMC077 - 4HP PARALLEL DAC
BMC078 - INFRARED INPUT
BMC079 - RISE FALL DETECTOR
BMC084 - 2 CH Voltage To Rhythm

Audio Generators


These modules generate an audio frequency range signal.

BMC010 - DUAL DECAYING NOISE
BMC017 - 2LFO SH
BMC018 - ANALOG DRUM
BMC020 - 1SONG
BMC023 - DECAYING ANALOG NOISE T
BMC025 - FM DRUM
BMC030 – GUITAR INPUT
BMC034 - SWITCHED RESISTOR VCF
BMC036 - DIGITAL HI HAT
BMC046 - DIGITAL NOISE
BMC073 - 4 KNOB DUAL DECAYING NOISE

Audio Processors


These modules take audio inputs and produce audio outputs. The timbre generators, VCFs, VCAs are all in this category.

BMC011 - WAVE ANIMATOR
BMC013 - RANDOM RESONATOR
BMC015 - VCA/MIXER
BMC021 - FULL WAVE DUAL RECTIFIER
BMC032 - BLENDED BANDPASS
BMC033 - 4046 SHAPER
BMC049 - ATTENUVERTING MIXER
BMC053 - FOUR QUADRANT MULTIPLIER AND PANNER
BMC054 - STEREO OUTPUT
BMC055 - SALLEN-KEY VCF
BMC059 - MULTI PWM
BMC062 - SIMPLE BLEND
BMC068 - 4HP UNITY MIXER
BMC074 - ATTENUATE OFFSET INVERT
BMC080 - DIODE LOW PASS FILTER
< BMC082 - 4HP TRIANGLE FREQUENCY DOUBLER
BMC083 - VC DELAY
BMC086 - DIODE HIGH PASS FILTER

System Outputs


These modules are designed to be outputs from your modular system.

BMC015 - VCA/MIXER
BMC047 - BALANCED OUTPUTS
BMC049 - ATTENUVERTING MIXER
BMC054 - STEREO OUTPUT

System Inputs/Controllers


These modules allow you to bring outside inputs to your modular system or they are designed to be manual controllers of pitch and rhythm.

BMC024 - MIDI TO GATE CONVERTER
BMC030 – GUITAR INPUT
BMC038 - PANEL KEYBOARD
BMC050 - MANUAL VOLTAGES
BMC056 - Utility Buttons
BMC075 - ENVELOPE FOLLOWER
BMC078 - INFRARED INPUT

Envelope Generators


These modules generate specialized fast moving CV signals called envelopes.

BMC017 - 2LFO SH
BMC019 - DELAYING AR
BMC030 – GUITAR INPUT
BMC031 – QTLFO
BMC042 - SIMPLE AR
BMC043 - 4X DECAY
BMC075 - ENVELOPE FOLLOWER
BMC078 - INFRARED INPUT BMC085 - 2X VC LFO
BMC087 - VC RELEASE

Utility/Other Function


These are modules with functions that don't fit in the other categories.

BMC037 - EURORACK BUFFER
BMC045 - PROGRAMMABLE ROUTER
BMC056 - Utility Buttons
BMC061 - VC MULTIPLEXER
BMC062 - SIMPLE BLEND
BMC066 - 4HP 2X3 Buffer
BMC067 - 4HP Quad Voltage Inverter
BMC068 - 4HP UNITY MIXER
7805 to LM317 7805 to LM317

Percussive Voice


These modules are designed to be standalone voices that resemble percussive instruments.

BMC018 - ANALOG DRUM
BMC023 - DECAYING ANALOG NOISE T
BMC025 - FM DRUM
BMC036 - DIGITAL HI HAT
BMC073 - 4 KNOB DUAL DECAYING NOISE

Uses Smaller pots


These are early designs when I used a smaller 12mm pot as my standard choice, these are a little more expensive and may be harder to find outside the US.

BMC004 - VC MASTER CLOCK/DIVIDER
BMC006 - VOLTAGE TO RHYTHM CONVERTER
BMC008 - MULTI-WINDOW COMPARATOR
BMC009 - USER WRITABLE QUANTIZER
BMC012 - STEPPED CV GENERATOR
BMC013 - RANDOM RESONATOR

Uses Eurorack Style Jacks


These projects are designed to mount to the panel with Eurorack style jacks, if building for other formats, be ready to do some work!

BMC024 - MIDI TO GATE CONVERTER
BMC037 - EURORACK BUFFER
BMC063 - 4HP BINARY COUNTER / DIVIDER
BMC064 - 4HP DECADE COUNTER
BMC065 - 4HP 3IN 4OUT LOGIC GATES
BMC066 - 4HP 2X3 Buffer
BMC067 - 4HP Quad Voltage Inverter
BMC068 - 4HP UNITY MIXER
BMC069 - 4HP GATE TO TRIGGER CONVERTER
BMC071 - 4HP DUAL SR LATCH
BMC072 - 4HP 4IN 3OUT LOGIC GATES
BMC076 - 4HP COMMON INPUT LOGIC GATES
BMC077 - 4HP PARALLEL DAC
BMC081 - 4HP GATE INVERTER
BMC082 - 4HP TRIANGLE FREQUENCY DOUBLER