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

[metasonix]

> 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.

Such things have existed for years, for use in controlling
organs and player pianos.

I recommend these. Have used many of them in my own products.
Very inexpensive and reliable.

http://www.j-omega.co.uk/index.html?/


Eric Barbour
Owner, METASONIX (www.metasonix.com)
Senior Editor, Vacuum Tube Valley magazine