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(nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another version Alternative: CV from something else use a nut behind the front Don't put R8 so close to R26 -- D36/R47 too close Testing before powering up: Clock In Normal - 1k to U2-8 (AND NOT short to U2-10 Clock Rate - variable resist +6k between U2-8 and U2-9 Reset Sw - when pressed, short +12V and Reset In - U1-13 (can get at from top when assembled Stop Switch - 10 LEDs - Consider: 1 simple on/off switch/button/knob/etc. PSU \+12V, -12V and ground needed, probably up to it. MSD: L* L* -> only second half of normal; muffle optional? A series of reflective photo interrupters/couplers, see http://www.osram-os.com/Graphics/XPic6/00200860_0.pdf reflective photo interrupters/couplers, see http://www.osram-os.com/Graphics/XPic6/00200860_0.pdf reflective photo interrupter coupler object detector Fiberoptic Reciver, RX, Toshiba, Toslink, TORX170, TORX173, TORX193, TORX194 Fiberoptic Reciver RX Toshiba Toslink TORX170 TORX173 TORX193 TORX194 IR Receiver Vishay TSOP-xxxx MINIMOLD IR Receiver Vishay TSOP-xxxx, MINIMOLD package, see https://www.vishay.com/docs/82493/tsop311.pdf package for Vishay CNY70 refective photo coupler/interrupter Vishay CNY70 refective photo coupler/interrupter Vishay CNY70 refective photo coupler IR Receiver Vishay TSOP-xxxx, MINICAST package, see https://www.vishay.com/docs/82669/tsop32s40f.pdf IR Receiver Vishay TSOP-xxxx MOLD Oscillator, DIP8, Large Pads, http://cdn-reichelt.de/documents/datenblatt/B400/OSZI.pdf Miniature Crystal Clock Oscillator IQXO-70, http://www.iqdfrequencyproducts.com/products/details/iqxo-70-11-30.pdf, 7.5x5.0mm^2 package crystal Epson Toyocom FA-238 series https://support.epson.biz/td/api/doc_check.php?dl=brief_fa-238v_en.pdf, 3.2x2.5mm^2 package Miniature Crystal Clock Oscillator Abracon ASE series, http://www.abracon.com/Oscillators/ASEseries.pdf, 3.2x2.5mm^2 package SMD Resomator/Filter Murata TPSKA, http://cdn-reichelt.de/documents/datenblatt/B400/SFECV-107.pdf, 7.9x3.8mm^2 package SMD Crystal Abracon ABM7, https://abracon.com/Resonators/abm7.pdf Abracon Miniature Ceramic Smd Crystal ABM3B http://www.abracon.com/Resonators/abm3b.pdf, 5.0x3.2mm^2 package SMD Crystal Oscillator Seiko Epson SG-8002JA https://support.epson.biz/td/api/doc_check.php?mode=dl⟨=en&Parts=SG-8002DC, hand-soldering, 5.0x3.2mm^2 package Fox TXCO temperature compensated oscillator SMD Crystal TXC 7M http://www.txccrystal.com/images/pdf/7m-accuracy.pdf, hand-soldering, 3.2x2.5mm^2 package.

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