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

[Peter Snow]

Hi Glen,

If you decide on a kit based solution, the PAiA midi2cv8 module may do what you require.  If you
look at PAiA's site under "9700 FAQ" there is a small section about using the unit to control relays
and motors. Quote: 

"The Ring terminal of a midi2cv8 is connected to the collector of a transistor that is turned on
when the CV output is greater than a volt or so. This transistor can be used to control a variety of
electrical loads such as relays and small motors". 

I think the Midwest Analog Midigator will also do something similar.

Cheers,

Peter


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