[sdiy] interlocking switches

[Don Tillman]

   > From: "Roy J. Tellason" <rtellason at blazenet.net>
   > Date: Sun, 14 Aug 2005 15:19:41 -0400
   >
   > I *know* I've seen this in some service manual or other, but
   > can't remember where...
   > 
   > Say you have a row of buttons, and you push one, an LED lights
   > up.  When you push another, that light comes on and the first one
   > goes out.  Sort of like the old mechanically-interlocked switches
   > I remember from ages ago.

(I'm chuckling  at the various answers involving JK flip flops,
debouncers, PICS, 4-16 line decoders, PLA's...)

The Moog Taurus bass pedal synth does this very elegantly.  Get a copy
of the service manual, or see the patent on my Moog patents page:
 
  http://till.com/articles/moog/patents.html

Patent 3,981,218: "Preset System for Electronic Musical Instrument"

And remember, for any question you could possibly ask, someone is
sure to reply "You can do that with a PIC."

  -- Don

-- 
Don Tillman
Palo Alto, California
don at till.com
http://www.till.com