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What we need




    Logical IC:

    The label of the logical IC's are some different by the different companys. But at all: there is a international standard. The last 4 numers in the label are the same everywhere.

    For example:

    The IC "4052"

    we need :

    MOTOROLA MC14052B
    PHILIPS HEF4052B
    TOSHIBA 4052B

    You can see: the last 4 numbers are the same.

    Don't use the 74... types (example 74HC4052).

    We need:
    1x 4052 (4 channel Multiplexer/Demultiplexer)
    1x MAX238 (in 24-DIL package) (RS232<->TTL transceiver)

    Voltage-Controller-IC:
    1x 78L05

    Transistors:
    2xBC108 (or similar npn) only for switch-function

    Resistors:
    5x 220 Ohm
    4x 10 KOhm

    Capacitors:
    5x 1 F/16V (micro Farad) tantal-capacitors
    1x 100 F/16V (micro Farad) electrolyt-capacitor

    5 DIN-sockets for the MIDI-connections

    1 SUB-D female plug 25 pin

    short piece 9 wire-cable (shielded)

    What kind of connectors at the PCB you are use, is your choice.

    A small METAL case (100x70X30);
    !!!It is very important for shielding radiation!!!