In this video I’m going to take a look at the finished voice card for a polyphonic synthesizer. It is a complete synthesizer with multimode filter on one board!
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Update: schematics and layout files are now up on Github: https://github.com/polykit/polykit-x-voice-card
There is a small batch of PCBs on Tindie for sale in case you are interested and would like to support my channel: https://www.tindie.com/products/polykit/full-voice-card-for-a-polyphonic-synthesizer-pcb
GitHub: https://github.com/polykit
Mastodon: https://chaos.social/@polykit
Voice Card Specs:
• A single oscillator with saw, triangle and pulse output
• Multiple VCAs to blend between different input signals, a main VCA for the envelope and a panning VCA for stereo output
• An additional external input that can be mixed in, eg. a noise signal
• One envelope generator for the VCA. It can also modulate filter frequency and resonance, also with an inverted signal
• A pole mixing multimode filter with 8 filter responses:
◦ 4P LP
◦ 2P LP
◦ 4P HP
◦ 2P HP
◦ 4P BP
◦ 2P BP
◦ 3P AP + 1P LP
◦ 4P N
• There are multiple options two switch and blend between different signals and filter responses
• PWM, FM and synchronization inputs
0:00 – Intro
0:48 – Test & Setup
1:35 – Functionality
2:25 – Multimode Filter Demo
4:50 – Outlook & Conclusion
Pole Mixing Filters: https://electricdruid.net/multimode-filters-part-2-pole-mixing-filters
Spectrum Analyzer and Scope: https://friture.org/
Music by LOOK MUM NO COMPUTER https://www.youtube.com/c/LOOKMUMNOCOMPUTER
#synthesizer
#diy
#analog