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metronome/hardware/eda/circuits
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Me Here 8f662598e4 PM_K-1 hardware: MIDI block (DNP) -- opto IN + buffered OUT/THRU 
circuits/midi.py, a do-not-populate option (USB-MIDI is the default). H11L1 opto-isolated
IN (breaks the MIDI ground loop), 74LVC14-buffered OUT (TX through two inverters) and THRU
(re-buffered IN). Connector is a face choice; core exposes the loop nets MIDI_IN/OUT/THRU_A/B
plus MIDI_TX/RX to the RP2350 UART. ERC 0 errors; netlist 0 errors.
CONFIRM: H11L1 pinout (standard; datasheet fetch timed out) + 3.3V-MIDI series-R values.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-05-30 23:28:59 -05:00
..
audio_chain.py PM_K-1 hardware: integrate audio chain into one netlist (dedup shared parts) 2026-05-30 20:41:39 -05:00
mcu_core.py PM_K-1 hardware: RP2350 core (MCU + flash + crystal + USB + boot/reset + SWD) 2026-05-30 21:56:12 -05:00
midi.py PM_K-1 hardware: MIDI block (DNP) -- opto IN + buffered OUT/THRU 2026-05-30 23:28:59 -05:00
power_tree.py PM_K-1 hardware: power tree (USB 5V -> +/-18V switcher -> clean +/-15V LDOs + 3V3) 2026-05-30 20:53:44 -05:00
rtc.py Firmware push fix on both Kit (0.0.24) + Explorer (0.0.4) 2026-05-30 22:51:46 -05:00
stage1_input.py PM_K-1 hardware: verify THAT1240 against datasheet; fix pinout + part numbers 2026-05-30 19:48:41 -05:00
stage1b_select.py PM_K-1 hardware: resolve TQ2SA relay pinout; Stage 2 DAC + reconstruction filter 2026-05-30 20:06:26 -05:00
stage2_dac.py PM_K-1 hardware: resolve TQ2SA relay pinout; Stage 2 DAC + reconstruction filter 2026-05-30 20:06:26 -05:00
stage3_sum.py PM_K-1 hardware: Stage 3 -- summing node (selected input + click) 2026-05-30 20:15:17 -05:00
stage4_driver.py PM_K-1 hardware: Stage 4 -- balanced output driver (completes the audio chain) 2026-05-30 20:27:04 -05:00