I built an analog POLYPHONIC SYNTHESIZER from scratch

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In this video I talk about the technical details of my DIY digitally controlled analog polyphonic synthesizer.

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.

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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 Adding PORTAMENTO to Raspberry Pi Pic...
- 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:
Video
Video
Video
Video

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

DCO:
https://blog.thea.codes/the-design-of...
How DCOs work, differences in Juno 6/...

Yusynth VCA: https://yusynth.net/Modular/EN/VCA/in...

GliGli Juno 60 chorus clone: http://gliglisynth.blogspot.com/2014/...

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