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Of http://www.st.com/resource/en/datasheet/stm32f302vc.pdf WLCSP-100, 10x10 raster, 9x9mm package, pitch 0.4mm pad, based on ** https://www.instructables.com/Another-MIDI-to-CV-Box-/ yet another fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another version Alternative: CV from something else VCF MK's Diode Ladder VCF Kassutronic's KS-20 VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules Envelope/Envelope.kicad_pcb | 2 | 10uF | Polarized capacitor | | | S1 | 1 | LM358 | Low-Power, Dual Operational Amplifiers, DIP-8/SOIC-8/TO-99-8"/> Low-Power, Quad-Operational Amplifiers, DIP-14/SOIC-14/SSOP-14 Schottky Barrier Rectifier Diode, DO-41 | | Tayda | A-3186 | | | | | J4 | 1 | SW_Push | Push button switch OFF-(ON) | Dailywell | PAS7B3M1CESA6-5 | Tayda | A-2939 | | C3, C4, C10 | 1 | 2_pin_Molex_header | KK254 Molex header 2.54 mm spacing | | J1 | 1 | B20k | Potentiometer | | | C12 | 1 | 1 | SW_3PDT_x3 | Switch, dual pole double throw D Switch, three position, single pole double throw, separate symbols | | | | | R24, R26, R28 | 4 | 100k | Resistor | | Tayda | A-1624 or A-2969 | | Tayda | A-1605 | \* Fit SIP socket for\nsocketing capacitors C13 marked 1 nF\non.

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