Use a BCD to Decimal, 4 line to 10 line decoder with open collector outputs
like the 7442? and connect the output wires for 1, 3, 5 and 9 back to the
pins for 0 1 2 and 3 on the inputs along with normally open pushbuttons from
each input pin to +Vcc.

---
James Newton mailto:jamesnewton@geocities.com 1-619-652-0593


-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Chris Eddy
Sent: Wednesday, September 20, 2000 16:21
To: PICLIST@MITVMA.MIT.EDU
Subject: [EE]: circuit for 1 of 4 select/latch function..?


I am trying to sketch a circuit that has four select push buttons for
inputs, and four seperate digital outputs.
I want to push a button and latch that output, and unlatch any other
selected output which was previously selected.

I have invested a few hours and all I have to show is some burnt brain
cells.  I am drawing a big blank.

The solution can be logic gates, comparators, transistors, but yikes, no
processor.  Customer wants no EMI analog answer.

Any of you folks remember this stuff?

Thanks
Chris Eddy~

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