Help with 60 second stopwatch project

[Canas]

Have to design a 60s stopwatch on ETS 7000 logic trainer using 74LS74, 74LS93 and 74LS00 IC chips does any one have any relevantant information any help is appreciated.

[russlk]

There is not enuf information here:  What is the source of time?  What does the output look like?

[MP]

What you are referring to is a MOD-60 or MODULO-60 counter. You can use a MOD-10 counter with one of the 74LS93s and a MOD-6 counter with the other to provide a MOD-60.

Here are some links. Some are ppt, so the download will take a while. The time to wait is worth it, though. Great examples and illustrations and they have the circuit that you need.

http://www.phx.devry.edu/fac/thomas/EET202/Cntrs.ppt
http://tennis.ecs.umass.edu/ece221/lecturenotes/ece221-ch7-part1.ppt
http://www.site.uottawa.ca/~rhabash/ELG3331LN08.pdf

Good luck!
MP

[hotwaterwizard]

Here are some more links to check out.

http://www.doctronics.co.uk/4013.htm

http://www.elec.qmw.ac.uk/staffinfo/davew/lab/ttl74.htm

http://www.faqs.org/docs/electric/Digital/DIGI_11.html

http://www.pcbcafe.com/BOOKS/SpiceHandBook/08_chapter07-02.php

http://wug.physics.uiuc.edu/courses/phys344/fall03/344exp/Lab2_TTL_Logic/Lab2_TTL_Logic.pdf

http://people.msoe.edu/~welch/summer/presentation.pdf

http://www.play-hookey.com/digital/decimal_counter.html