2021-12-06 (M) EWC_Panel MIDI input circuit boards

When I trimmed PCBs for the button arrays, I saved some leftovers. They were tiny bits of stripboard, but they were useful now for making MIDI input isolators. MIDI signals typically pass through optical isolation, so excessive line voltage cannot damage the receiving controller. I mapped out the minimum size for the circuit, and my boards were taller and wider than necessary. The incoming signal requires two connections and one resistor, while the outgoing line requires three connections with a resistor. I also included a ground for the incoming data, but that wasn't necessary. The only modification necessary on the copper was a split between the four pins of the optoisolator. I tried to grind off the traces with a drill bit, but cutting them with a razor was more effective.

After cutting the traces, I installed my chips, resistors, and one jumper on each board. I manufactured six and realized these were not as complicated as I thought and less intimidating now that I've built a few. I sketched out a schematic to know what each track is from each side. There are five levels on each side, but I never use more than three. Each panel will require a MIDI input, and I should have that covered now.

Circuit boards and schematic

The rest of the posts for this project have been arranged by date.
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Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8

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2021-12-06