How to design mod 60 counter with only 7493s?

[ntquartex]

How can we design mod 60 counter with only 7493 or 7476 FFs.

[EnigmaOne]

This may be a handy reference for you:
http://www.pnc.edu/te/ecet157/LabReps.PDF
which deals with 7476s.

In short, you'd do a mod-10 counter implementation with 7476s, overflowing to a mod-6 counter implementation.

Reset is the same as would be accomplished with a decade counter, but the NAND-ing (use 7400s) would be wired for a reset at a binary count of 0110.

Considering the state of each Q and Q' at various count conditions, view the counter cascade as a whole, with an eye toward the reset condition for each counter stage. The solution should then be fairly obvious to you. (As in a program loop, the trick lies in specifying the terminal condition.)

If you have problems figuring it out--which you should really try to do on your own first--post back and I'll give you a bit more information on the matter.

[sp&g mods]