[Heathkit] SB-650/led modification

[john]

At 12:17 PM 5/2/04 -0400, wb8jkr at juno.com wrote:
>
>
>  I have a question for you digital TTL type guys, I'm an
>RF man myself.  ;^)
>
> Anyway, I'm thinking about converting my SB-650 from a
>nixie readout to a seven segment LED display. It looks
>to me like "basically" the 7447 BCD/decoder driver for the
>LED's is the same thing as the 7441 used to drive the nixies
>except for interchanging a few pins.
>
> Of course the +170 volt supply for the nixies would no longer
>be needed, just the 5 volt supply for the LED's, and I think the
>stock circuit board can remain, just pull out the 7441's and run the
>four lines from each storage register to each 7447 input.
>
> Any thoughts?

        Sure!

        Why?

         Nixies are so cool, and match the era so well!

        73
        John
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