via Barton Musical Circuits
"This module is composed of two voltage controlled comparators which are gate outputs that turn on when an input voltage exceeds a threshold voltage. Four additional gate outputs turn off and on depending on the relative outputs of the comparators. This was initially designed as a way to add soft-sync features to VCOs that only have hard-sync, but has also been useful for turning envelope generators into gated loops
This design can be used with +/-15V systems with a few resistor value changes."
"This module is a controller that uses a large knob to control pitch and a button to generate triggers and gates. It features internal Sample/Hold and Slew circuits. The PCB has MOTM and Eurorack style power connecters. The jacks are the only panel parts not PCB-Mounted making for easy wiring while being flexible for use in different synth formats. There are also mounting holes for using offboard pots/switches."
"This module is a PIC-based rhythm generator inspired by old rhythm boxes and keyboard presets. Kick and Snare patterns are selected using the knobs. It features an internal clock but is compatible with an external clock. There are CV and trigger inputs for pattern selection allowing for an external sequencer to be used. It features Eurorack and MOTM style power connecters and can be used on either 12V or 15V systems without modification."
"Takes a gate/trigger input and outputs a burst of pulses. The amount and speed of the pulses are controlled with knobs and control voltages. Can be set to a specific number of pulses, a random number or pulses to fill up a specific amount of time.
Compatible with 12V or 15V systems. Can be used with 9mm or 16mm pots, my panel is designed for 16mm pots."
"A VCA circuit in series with a clipping circuit creates voltage controlled distortion. Two independent channels, can be used as a waveshaper or as a VCA that adds harmonics.
Compatible with 12V or 15V systems. The Pots are PCB mounted, but all other parts are mounted off board."
"New prototype from Barton Musical Circuits. MWC = Multi-Window Comparator. Sorry for the blur, I'm working in a basement and the light's not great.
In a nutshell, this looks at your input voltage, converts it into a number, then looks that number up on a data table and turns a +5V output on if the table tells it to. It does this 4 times, for 4 different outputs. There are attenuation and offset knobs for conditioning the input signal, write/erase buttons for writing the "on/off" tables, and save/load and bank select switches for saving your tables to the internal EEPROM.
The write/erase buttons could also be replaced by input jacks so you're rhythm generating devices could write the tables. The board has euro/motm power connector pads. The board has 2 pc mounted pots, and it also has 4 mounting holes so people can feel free to create their own layout. I am going to try to offer a Eurorack front panel for this as well.
I will be writing build documentation for this soon. I'll have boards/PICs to offer for this next month, and a set will be $20 plus postage."
"A dry boring demo of the features of a new quantizer module I've designed. More info will be up at www.bartonmusicalcircuits.com after I get it written.
To summarize: Instead of pre-loaded scales/modes, you're using write/erase buttons to create a data table that records all possible outputs, if you saw my MWC demo, this will seem familiar (I actually copy/pasted some of the code).
There are additional controls for: turning the quantizer off, triggering a new sample (it constantly samples when nothing is plugged into this jack), controlling whether the quantizer quantizes above or below the input voltage, a "softness" control which acts like a voltage controlled portamento with fun interactions with the trigger-new-sample control. It can also save two banks of notes onto the internal EEPROM. There is also a bi-polar/positive only switch so it can interact with more voltage sources.
There are input jacks for the quantized signal, a secondary cv (with attenuation pot), external softness cv (with attenuation pot), write and erase jacks for triggering from external sources, trigger-new-sample, and quantize on/off.
Finally, and I didn't get into this on the demo, the board is set up so that the range of the module is adjusted by just a couple of trim pots (an input attenuator and an output amplifier) so individual builders can decide whether they want more range or accuracy. Different people will use this differently so I'll leave it up to them. On this demo I had it set up for 10V range. The table of possible outputs has 1024 parts (because the PIC has a 10-bit ADC), so this gives me 102.4 pitches/octave. At 5V you'd get 204.8 pitches per octave.
This prototype had a few errors on the PCB, so I'm waiting for a revised PCB to show up (should be in the next couple weeks), and if I got all my errors on that, then boards should be available to ship in early to mid January. I think a board/chip combo will be $22. This uses all through hole components, and pc-mounted pots, but has mounting holes so people don't have to use the pc mounted pots. It has euro/motm power connecters and will work with +/-12v or +/-15v with no modification.
I think I'll also be selling a few of these with hand made front panels if anyone thinks this is a cool module but is intimidated by all of the wiring. This is 8HP in euro-rack."
BMC093 Diode Shaper VCA Demovideo upload by boogdish
"Demonstration/Overview of a new synthesizer module design.
I provide PCBs/Panels for DIY builders and also sell pre-built modules on my site. Visit https://www.bartonmusicalcircuits.com... to get more information on this module.
PCBs and fully built modules can be ordered from: https://bartonmusicalcircuits.com/sho..."
This module is a VCA that uses rectified feedback/feedforward to provide waveshaping. Both the feedback/forward knobs can provide positive or negative feedback and the external CV control is an attenuverter. It also includes switchable Zener diode limiters to soften the output when large amounts of positive feedback are used. The module is DC coupled, so it can be used with LFOs, Envelopes and CV sources as well waveforms. The DC coupling also allows for DC offset to be applied to the input which increases harmonic possibilities.
This module is designed for 12V systems, but works with 15V systems with just one resistor change. The documentation gives tips on how to tweak or modify the circuit.
BMC092. Sample Release Demo video upload by boogdish
"This is a demo/overview of a new synthesizer module design. More information (schematics, ordering, etc) can be found at bartonmusicalcircuits.com/samplerelease/"
The Sample Release is a 4 channel bipolar envelope generator module that can also act as a sample-and-hold or track-and-hold. Each channel takes a voltage input, samples it and then that voltage goes to zero volts with it's rate controlled by the release knob. This generates control envelopes that fall when positive voltage inputs are applied and rise when negative voltage inputs are applied.
Each channel has a toggle that disables the release function and lets the channel act as a traditional sample-and-hold or track-and-hold. Additionally, a +5V supply is normalized to the voltage input so the module can also be used as a normal release generator
"This is a specialized module for controlling 1V/Octave oscillators and filters. A single CV input is offset and quantized to create 4 voice chords. Chord voicings can be saved and loaded using external CV. It also features a single slew control for all four outputs, random chord selection and more
The board features PC mounted pots for less wiring, and mounting holes for flexibility in panel layout. There are Eurorack and MOTM power connecters. It's compatible with 12V or 15V synth systems without any parts substitutions"
"This is a demo of a do-it-yourself synthesizer module. It combines two LFOs and a Sample Hold in one printed circuit board. To learn more or get a PCB, visit http://www.bartonmusicalcircuits.com/..."
"This is a demo for BMC36 Digital Hi Hat. This is a PIC based DIY synthesizer module. If you're building a synthesizer system and would like to build one of these for yourself, please visit http://www.bartonmusicalcircuits.com/..."
"This is a PIC based percussion module which is loosely modeled on the hi-hat. It features seperate Decay and Pitch controls for Open/Close modes and a master Shape control which mixes between a linear or logarithmic decay. This module is also compatable with the BMC003X Expander for using external CV for all of it's parameters."
"This is a DIY synthesizer module demo. If you're interested in building this for yourself, PCBs and preburnt microcontrollers are available at http://www.bartonmusicalcircuits.com/..."
"An easy to build and easy to calibrate square wave VCO. Features 1V/O tuning, external CV input for modulation. Ideal for beginners or people needing a very small simple VCO to expand their system.
Compatible with 12V or 15V systems. The Pots are PCB mounted, but all other parts are mounted off board."
"New DIY Synth module. A graphic envelope generator. PCB/Panel/Microcontrollers are available on my site and a PDF with schematics/parts list etc https://www.bartonmusicalcircuits.com..."
"An envelope generator using slide pots like old graphic equalizers. Choose points in the envelope to loop during sustained portions. Use it as an LFO or as a normal step sequencer. A fun, tactile way of controlling modules.
Compatible with 12V or 15V systems. Jacks are wired offboard, but all toggles and pots are mounted to the PCB. This design requires a slide pot from the Bourns PTL30 series, check for availibity before ordering."
"This module is a specialized VCA that can act as a Four-Quadrant Multiplier (sometimes referred to as a 'Ring Mod') or as a panner.
The board features PC mounted pots for less wiring, and mounting holes for flexibility in panel layout. There are Eurorack and MOTM power connecters. It's compatible with 12V or 15V synth systems without any parts substitutions"
"This is a demo of a new synthesizer module I've designed. PCBs, panels and microcontrolelrs available for DIY synth builders, visit http://www.bartonmusicalcircuits.com/... for more information"
"This is a demo for DIY synthesizer module. If you're interested in building it for yourself, there's more information at http://www.bartonmusicalcircuits.com/..."
"This is an analog module that allows for uniform detuning and offseting of control voltages. It has a CV input and an offset input. It has outputs for the offset being applied positively, negatively and double offset applied positively and negatively. When used without the CV input, it can be used as a standalone inverter or fixed gain amplifier."
This module is an eight step CV sequencer with it’s 4 different outputs which change the outputted step at different rates with each output changing at half the speed of the previous output.
Compatible with 12V or 15V systems, panel components are PCB mounted, but pinouts for interboard connectors are labeled in schematic for building in other formats. Only has power footprint for Eurorack.
This is a CV processing module that analyzes voltages mathematically. It has outputs for highest, lowest, sum, difference, absolute difference and negative sum
Compatible with 12V or 15V systems, jacks are PCB mounted.
"A new DIY synthesizer module design. This lets you use a keyboard, sequencer or other MIDI controller with your modular synth. Two sets of CV/Gate/Trigger outputs with keyboard split, multiple note priority sets, bend inhibit and midi clock output."
"This is a two voice Midi to CV converter module. It has a keyboard split option allowing you to separate the keyboard into two separate synth voices, tune mode, multiple sets of note priorities for when more than two notes are played at the same time, options for inhibiting note bend on an individual output and output for the MIDI clock.
The PCB is set up for attached 3.5mm jacks and a detached MIDI input jack. If someone wanted to adapt it to a +/-15V system, no parts changes would be required."
"This is a demo of the Barton Musical Circuits Full Wave Dual Rectifier synth module. This is a DIY modular synth project that's used as a "waveshaper." For schematics, BOM, mp3 demos and information on ordering PCBs or panels, see http://www.bartonmusicalcircuits.com/..."
"Demo for a new project from Barton Musical Circuits. If you're interested in building one of these modules for yourself, visit http://www.bartonmusicalcircuits.com/..."
"This module is a 12-stage phaser or all-pass filter with resonance control. When the filter’s output is mixed with the input, this creates notches in the frequency response. Classic phasing sounds are achieved by modulating the frequency control with an LFO. It can also be used as a 4-stage filter by removing the top PCB and jumpering pins 1 and 2 of the pin connectors together.
This module uses two circuit boards sandwhiched together. It's designed for 12V systems and can be easily modified for use with 15V systems."
"This module is composed of two Sallen-Key low pass filters designed to be used on very low frequencies. When pitch control voltages are processed through this, it creates a portamento which then turns into vibrato. Depending on resonance control, this vibrato can die out almost immediately or go on for the duration of the note. When used with envelope generators, this module can be used to add extra "bumpiness" to an envelope signal allowing for more harmonic content. With a gate signal, the module can be used as a simple envelope generator with equal sloped attack and release.
This design can be used with +/-15V systems without modification"
