Please count down digital clock minite --hour--days circiut please

[mateeong]

Greetings all,
This is my first post on this forum.
I've been playing with circuits and components for near 4 months now, and it is enjoyable.
I have a question on changing the count direction of a 4510 cmos ic.
I have two 4510 BCD counters connected to two 4511s which drive two 7 segment displays.
count down minite - hour - days circuit
minite 60----------1 minite
hour 24----------1 hour
30or31 days----------1
I want circuit same
I poor english
Thanks very mush

 

[mateeong]

**broken link removed**
I try this circuit it not work
Please Help
Thanks

 

[blueroomelectronics]

It should work fine, check your wiring.

 

[mateeong]

Thanks for Help
It don't work
do you have circuit?
Thanks

 

[blueroomelectronics]

Here's a TTL Clock.
Home
**broken link removed**

You'll have to add the days counter but you can skip the seconds display.

Why are you building it?

 

[chrisIngenieur]

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