I built an analog POLYPHONIC SYNTHESIZER from scratch

In this video I talk about the technical details of my DIY digitally controlled analog polyphonic synthesizer.
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This is the first video of a series where I talk more in depth about the different components. All schematics and PCB layouts can be found on my GitHub site.

I’M BUILDING AN ANALOG POLYSYNTH - AGAIN PT1: https://www.youtube.com/watch?v=3vlqWBn1umI
How I built a PATCHABLE ANALOG SYNTH from scratch: https://www.youtube.com/watch?v=aMLMR25Tyi0
A full SYNTHESIZER on one board including MULTIMODE FILTER: https://www.youtube.com/watch?v=2grRbG7IwDw
Designing a VOICE CARD for a POLYPHONIC SYNTHESIZER: https://www.youtube.com/watch?v=quJYekSshpI
Thinking of a new design for an analog POLYPHONIC SYNTHESIZER: https://www.youtube.com/watch?v=PIcLOdBZ5Xk
Polykit-6 Demonstration: https://www.youtube.com/watch?v=go1mErOdtsU

GitHub: https://github.com/polykit
Mastodon: https://chaos.social/@polykit

0:00 - Intro
0:42 - Motivation & design choices
2:12 - Basic synthesizer & polyphony
4:00 - PCB layout excursion
4:56 - DCO
5:43 - State variable filter
6:41 - ADSR
7:06 - VCA
7:17 - LFO
7:29 - Chorus
7:42 - Additional components
8:11 - Conclusion & outlook
9:08 - Demo

Specs are:
- 6 voices polyphonic analog DCO based on Roland Juno 106 using a single Raspberry Pi Pico
- Sawtooth and square signal
- PWM control (manual, LFO)
- Voice stacking and de-tuning
- MIDI input
- MIDI pitch bend
- MIDI portamento https://youtube.com/shorts/DGcm8E8b2Ko
- CEM3350/AS3350 state variable filter
- Lowpass and bandpass output
- Frequency cutoff/center control (manual, ADSR, LFO)
- Resonance control (manual, LFO)
- LFO
- 2x ADSR based on CEM3310/AS3310 (SVF, VCA)
- Roland Juno 60 chorus clone

Attention! This is not for beginners in electronics nor a finished product.

Synthesizer Basics:
https://www.youtube.com/watch?v=SE9ZtG0E58g
https://www.youtube.com/watch?v=OHbvecDEqsI
https://www.youtube.com/watch?v=EPUjrjAyfzU
https://www.youtube.com/watch?v=jkv29Pf3VvM

Kicad Replicate Layout Plugin: https://github.com/MitjaNemec/Kicad_action_plugins

DCO:
https://blog.thea.codes/the-design-of-the-juno-dco/
https://www.youtube.com/watch?v=mqY6cVJS9fo

Yusynth VCA: https://yusynth.net/Modular/EN/VCA/index.html

GliGli Juno 60 chorus clone: http://gliglisynth.blogspot.com/2014/05/new-diy-project-standalone-juno-60.html

#synthesizer
#polyphonic
#diy

Видео I built an analog POLYPHONIC SYNTHESIZER from scratch канала Polykit Synth