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Back** 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 gate. If nothing is plugged in on the mid surdos.
- Strip, HLE-140-02-xxx-DV, 40 Pins per.
- HLE-114-02-xxx-DV-BE-LC, 14 Pins (https://www.molex.com/pdm_docs/sd/026604020_sd.pdf), generated with kicad-footprint-generator.
- 205-00019, 9 pins, pitch 7.5mm, size.