Knowledge of history doesn't = having lived it :-) http://www.play-hookey.com/digital/electronics/dtl_gates.html
3 to 1 is not all that odd if you have 5 to 1 and 2 to 1 ratios as the page above indicates. Stanley ----- Original Message ---- From: Bob Camp <[email protected]> To: Discussion of precise time and frequency measurement <[email protected]> Sent: Fri, January 8, 2010 8:10:34 PM Subject: Re: [time-nuts] Digital Clock kit - no Integrated circuits! Hi It seems like the diode to resistor ratio is a bit off in that design. In order to go into further detail, I would have to admit to starting out in the pre-integrated circuit logic era .... Bob On Jan 8, 2010, at 8:07 PM, Tom Clifton wrote: > http://transistorclock.com/ has a very interesting (though a bit expensive) > kit for sale. A 10" x 11" circuit board sporting nearly 200 transistors and > 600 diodes to drive six seven-segment displays. Suitable for framing... As > delivered runs on 60hz but there is a note about conversion to 50hz mains. > You can buy a bare board, just the components or a full kit. > > You must see it to believe it! > > Tom > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
