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.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    FM reciever with LM386
    Triac relay-contact protection
    Simple color organ
    Voltage-Tuned Vhf Oscillator
    Highly Stable 60Hz Sine-Wave Source Circuit
    Basic RF Oscillator circuit diagram
    Flash programming of AT89 microcontrollers using ISP adapter
    TDA7000 FM Radio Receiver Circuit
    Doorbell Sound with CD4001 CD4060
    Design on the basis of the mechanically controlled digital frequency meter of one piece
    PIC18F2550 Pinguino
    simple magnitude comparator
    Easy LED Photo Sensor Circuit With LM1458
    5 Minute Digital Clock
    Voltage-Controlled Oscillator