IDJ Sparkz wrote:

> Thanks Tony! Theoretically (well from what I know) this looks like it
> will work! Thanks a lot. Gosh it was so simple!

  Not the version I read!  I respectfully submit that the recurrent
references to a J-K flip-flop are at best misguided, and at worst
nonsensical.  The type required for this application is in fact an R-S
flip-flop, consisting of two NAND or NOR gates.

  The circuit is colloquially referred to as a "Kitt Scanner" for
reasons which *should* be self-evident, and has (hint!) been published
in various incarnations (not all worthy of looking at!) in quite a
number of hobby magazines over the years.

  Call it "research".

  Cheers,
        Paul B.