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Build your own SoundBlaster compatible MIDI interface
This is a very old project, from the days a SoundBlaster 16 was
a miracle,... A lot of people keep asking for these schematics so
I decided to put it on my webpage.
Remember: This is for the Soundblaster (and compatible)
cards that use their Joystick-port for MIDI access !
Building this is pretty cheap ... :)
Read the disclaimer!
Scematics and parts
The chip in the upper part, called "MIDI Instrument
to computer", is an optocoupler, this can be either a 4N35
IC2A and IC2B combine to one single chip
IC2, which must be a 7404.
D1 a common diode for example a 1N4108 (not required).
R1 is a resistor of 270 Ohm.
R2 is 1 KOhm,
R3 is 4700 Ohm (also known as 4K7 Ohm),
R4 and R5 are 220 Ohm.
C1 and C2 area ceramic capcitor of 220
For the connector (plug) to the MIDI devices we need
a so called DIN-5 connector, a rond plug with 5 connections. For the joystick
we need a 15-pin SubD:
Note: both parts (to and
from the MIDI device) are seperate scematics and can be used seperately,
so if you only want to "read" key pressures of a keyboard into
your computer, then you only nee the "MIDI Instrument to computer"