ElectroTechnique Tsynth

Electrotechnique TSynth

Teensy based DIY programmable Poly Synth

PCB V1.3 / display set including

• ​The main PCB with SMD components already soldered: two 4067 multiplexers, 6N138 based MIDI In opto-coupler, buffer for MIDI thru and all resistors and capacitors (the green PCB)
• Display + display holder

Panel, acrylic case parts and 3D-printed side panels available in various colours


Electronic parts kit including:

• Teensy 4.1 and matching audio board without SD Card.

• All additionally needed electronic components: pots, encoder, buttons, connectors, ...

Details:

Oscillators
 

• 12 voice polyphony (last note priority), two oscillators per voice, velocity sensitive, detunable with +/- 2 octaves range, Sine/Sample & Hold (like tuned noise)/Square/Sawtooth/Ramp/PWM/Var Triangle/User waveforms and level. Square, Sawtooth and Pulse waves are band-limited.

• Pulse Width/Var Triangle can be set for each oscillator with PWM by dedicated LFO or from the filter envelope

• Pink or white noise level

• Dedicated LFO for pitch mod (can be retriggered by note on), Sine/Triangle/Sawtooth/Ramp/Square/S&H waveforms

• Pitch can be modulated by filter envelope (+/-)

• Oscillator FX - XOR creates lots of harmonics with certain waveforms and X Mod ‘Cross Modulation’ bell-like sounds.

• Dynamic Unison with all 24 oscillators detunable from each other - one, two, three or four notes can be played with oscillators distributed among them

• Chord Unison with all oscillators playing a chord selected from detune control - major, minor,

• diminshed…

• Polyphonic Glide with variable time

Filter

• State variable 12dB filter (SVF) with continuous mix between LP and HP (provides notch filter) and BP

• Cutoff freq and resonance

• Cutoff can be modulated by dedicated ADSR envelope (+/-), dedicated LFO

• LFO has same waveforms as pitch LFO (can be retriggered by note on) and rate can be set to match MIDI clock (tempo) with variable time division (1,3/4,1/2,1/4,1/8…)

Amplifier

• Dedicated ADSR envelope

• Volume

• Effect amount and mix - currently for stereo ensemble chorus rate and mix but could be set up to allow choices in Settings menu

Patch & Program Buttons

• Encoder with button for data entry, Back button for menu navigation

• Save and Delete buttons for storing patches

• Holding Settings initialises the current patch to match the panel controls. Holding the Save button takes you into a patch deletion page.

• Settings Menu - Velocity curve, Pitch Bend and Mod Wheel range, VU Meter, Oscilloscope display, Bass enhance, MIDI In and Out channel.

MIDI

• USB HOST MIDI Class Compliant (direct connection to MIDI controller, no PC needed)

• USB Client MIDI In from PC

• MIDI In 5 pin DIN

• MIDI Thru 5 pin DIN

Audio

• SGTL5000 Audio Shield 16 bit, 44.1 kHz Stereo out

• USB Audio in/out—appears as 16 bit, 44.1 kHz audio interface on PC

BOM/build doc

Firmware