Tom McCurdy

I am working at a summer camp and am trying to revive an old class that they use where they created working digital clocks out of some IC's and 7 segment displays. I was hoping someone could provide me with a link to a schematic of a working digital clock (cheap is good). Also added bonus if you can find one that uses these parts

IC's
DM74LS00N
DM74LS04N
DM74LS90N
CD4011BE
CD4012BE
SN74LS73AN
DM74LS32N
DM74LS73AN
SN74LS47N
DM74LS73AN
DM74LS02N
DM74LS73AN
CD4020BE

AND 7 SEGMENT DISPLAY
MAN6990 F

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Physics-Electronics-

dipal_z

It can be very easily done by using four 7490 and 7447 and clock generator using 555 timer. Unfortunately I don’t have schematic but you really don't need one if you know how to wire 7490 to count till required value instead of 0 to 9. Wire two LSB 7490 to count from 00 – 59 and MSB 7490 to count from 1 to 12 or 1 to 24 as required.

Laplink

I hope it helps.

http://www.isitcrunchy.com/24clock.htm

jbeng

Probably should be 0 to 23 as required ...
JB

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