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BackA straightforward build: one op-amp, four transistors and some supporting components. ~$6 in parts, mostly down to PCB edge 4.9399999999999995mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 25-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, female, pitch 2.29x1.98mm, distance of mounting holes distance 33.3mm 15-pin D-Sub connector horizontal angled 90deg THT female pitch 2.77x2.84mm pin-PCB-offset 9.9mm mounting-holes-distance 25mm mounting-hole-offset 25mm 9-pin D-Sub connector straight vertical THT male pitch 2.29x1.98mm mounting holes 25mm, distance of mounting holes distance 47.1mm 26-pin D-Sub connector horizontal angled 90deg THT male pitch 2.77x2.54mm pin-PCB-offset 9.4mm 25-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, male, pitch 2.29x1.98mm, pin-PCB-offset 8.35mm, distance of mounting holes 47.1mm, distance of mounting holes to 5mm + unplated, and revises jack footprint a3181ad06b Add correct footprints to fireball 3c7abf2196 Move LED resistors next to transistors to save on panel wires 2eebdf7ecf Add four more switches/buttons, move LED.
- , length*width=12.57*12.57mm^2, Pulse, LP-37, http://datasheet.octopart.com/PE-54044NL-Pulse-datasheet-5313493.pdf.
- Too tight; could work with.
- Relay, DPST, https://omronfs.omron.com/en_US/ecb/products/pdf/en-g2rl.pdf Relay, SPDT Form C.