[sdiy] MIDI to solenoid/optoisolator/relay interface?

[Seb Francis]

Hi Glen,

You can find such a circuit here:
http://www.hku.nl/~pieter/HARD/MIDI2SW/MIDI2SW.html
(although the author does state that there might be mistakes in the diagram)

I've also designed and built something myself which accepts MIDI note-on/note-off and has 8 gate outputs, and 16 trigger outputs (I use it for triggering audio gates, drum machines, etc..)  My design is based on the now obsolete 6402 UART - if you are interested I can send you the circuit diagram / PCB layout, and I have a couple of 6402's (I could sell you one if you like).

Seb



Glen wrote:

> I've seen plenty of products and projects that interface MIDI in various
> ways. There are key switch scanning circuits that add MIDI outputs to older
> keyboard-based instruments. There are MIDI to CV converters, to add MIDI
> inputs to modular synths. You get the idea.
>
> What I'm having trouble researching on the internet is circuitry that
> accepts an incoming MIDI stream and controls either solenoids,
> optoisolators, or relay contacts. I have a few uses for such a conversion,
> but have trouble finding much on the internet.
>
> Part of the problem is not knowing what to call this sort of MIDI
> interface. I appreciate any pointers. I'd prefer to build my own project,
> but I might also be interested in existing commercial interfaces.
>
> thanks,
> Glen