[sdiy] Pressing buttons

[John Speth]

> If you use a 4-16 line decoder... hook up the switches to
> data inputs Q1-Q4. Then run a high value feedback resistor
> from output 1 to Q0, output 2 to Q1, output 4 to Q2, and output
> 8 to Q3.   Then push a button... the corresponding output goes
> high and latches the input because of the feedback....
> 
> not my idea, saw it years ago using a 3-8 line decoder in ideas for
> design
> or some such...

Harry is right.  It was an "Ideas for Design" topic from EDN from the early
80s.  I've used the circuit and it works very well.  This is exactly what
you want.

John Speth
Molectron Detector, Inc.
http://www.molectron.com
mailto:johns at molectron.com 

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