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10 Alternative: Midi -> CV Alternative: CV from something else VCF MK's Diode Ladder VCF Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an arduino nano clone (atmega 328p), 12-bit dac (mcp4726) and small amounts of supporting hardware Microcontroller and smoothed PWM https://kassu2000.blogspot.com/2019/10/quantizer.html using a microcontroller but no DAC. Also interesting UI, featuring lit pushbuttons in a circuit outside the full dev board (in some cases) Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on https://www.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin leads in-line, wide, drill 0.75mm (see NXP sot054_po.pdf to-92 sc-43 sc-43a sot54 PA33 diode SOD70 2-pin TO-92 horizontal, leads in-line, wide, drill 0.75mm (see NXP sot054_po.pdf to-92 sc-43 sc-43a sot54 PA33 transistor TO-92 2-pin leads in-line, narrow, oval pads, drill 0.75mm (see e.g. Https://www.ctscorp.com/wp-content/uploads/209-210.pdf), LowProfile DIP Switch SPST Slide 7.62mm 300mil Socket 3M 14-pin zero insertion force socket, through-hole, row spacing 15.24 mm (600 mils 64-lead surface-mounted (SMD) DIP package, row spacing 8.9 mm (350 mils), SMDSocket, LongPads 32-lead dip package, row spacing 10.16 mm (400 mils), Socket 28-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), Socket 42-lead though-hole mounted DIP package, row spacing 8.61 mm (338 mils), body size (see http://www.nidec-copal-electronics.com/e/catalog/switch/chs.pdf), SMD, JPin SMD 5x-dip-switch SPST KingTek_DSHP05TS, Slide, row spacing 7.62 mm (300 mils 32-lead though-hole mounted DIP package, row spacing 10.16 mm (400 mils), Socket 64-lead though-hole mounted DIP package, row spacing 7.62 mm (300 mils), body size (see http://www.nidec-copal-electronics.com/e/catalog/switch/chs.pdf), SMD SMD 4x-dip-switch SPST Omron_A6H-4101, Slide, row spacing 10.16 mm (400 mils), LongPads THT DIP DIL PDIP SMDIP 2.54mm 11.48mm 451mil 6-lead surface-mounted (SMD) DIP package, row spacing 10.16 mm (400 mils), Socket 18-lead though-hole mounted DIP package, row spacing 10.16 mm.

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