2021-10-27 (W) EWC_Panel Drum machine circuit

The first schematic I did was the timer panel, and it will probably prove to be the simplest in the whole project. The drum machine came next, and it will probably be the most complicated. The programming should not be terribly complex compared with the ordinary instrument panels. Still, it has more hardware, including a sizable light array, more buttons than any other panel, and an OLED screen. I'm glad I did the timer panel first because I didn't forget any hardware until the end. Since there is a MIDI input, I added a sub-board where I will install an optoisolator.
Circuit sketch for drum machine

The rest of the posts for this project have been arranged by date.
First time here?

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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