You could use a PIC running at, oh, say 50 or 60Hz.  The EMI would be much lower
than what the power lines are giving off.

-Adam

Chris Eddy wrote:
>
> 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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