MIDI Drum Machine Schematic Main CPU Section

Posted on Feb 5, 2014

The 82C55 and 7 segment decoders on the display board will be changed to a group of shift registers on the display board, so that the 82C55 and the large number of wires won`t be needed. The ADC0804 will be replaced with a serial interface ADC chip, and the 8051 will be replaced with a 89C51, so that the 27C16, 74HC373 and 74HC138 won`t be needed.

MIDI Drum Machine Schematic Main CPU Section
Click here to download the full size of the above Circuit.

The main idea is to greatly reduce the number of wires, so that people who attempt to build the design without a printed circuit board will have far fewer wires to interconnect, and most wiring errors will result in only a portion of the drum machine not working, instead of having the entire thing dead and no reasonable way to troubleshoot. The new board will also only require a single 5 volt supply and will use an inexpensive EEPROM chip instead of battery backup.

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