By Will Dahlgren
|In a message dated 95-08-21 15:38:34 EDT, you write:|
> Its probably time for me to do some "research" into
> MIDI -to- contact-closure devices. The WIMP appears to
> be one of 3 such devices out there. I think you
> have the largest current drive capability. I'd like to
> get the whole scoop...
[ some of my text deleted ]
Bob Baker, at Electric Orchestras ( 708 367-7996 ) makes the WIMP from my design. You can call him for any literature he may have. I believe he sells the processor for $330 and each 8 "thing" driver for $30. You only buy as many drivers as you need.
The processor board is 4 1/2" x 6" and has a 5V regulator, 3032 micro, MIDI in, and 8 74HC259 latches. It is powered by a wall wart and draws about 100-200 ma. The outputs from the latches go to eight 10 position ribbon connector headers. +5V and GND are also on the connectors. Depending on the connectors selected, driver boards ( 1 1/2" x 4 1/2" ) can plug on the processor or be connected by a 10 wire ribbon cable.
The drivers normally have 8 mosfets good for 3A @ 24V. However any TO-220 mosfet could be used. The only limitation is that their placement doesn't really allow for heat sinks.
Two options: If you only need +5V logic output or want to sink 150ma @ 18V, only the processor is needed. There is a pin for pin equivalent for the 74HC259 (NE590) that can directly sink the 150ma.
The MIDI program just decodes ON/OFF messages. There are 16 midi channel tables in the EPROM. For custom stuff any note on any midi channel can be mapped to control any "solenoid". This is done just by editing the Eprom tables.
(Message sent Tue 22 Aug 1995, 16:13:03 GMT, from time zone GMT-0400.)