clock problem

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yasir_66

Joined Jun 25, 2009
71
Sir i am making a BCD counter.I used HEF4543 for driving 7-segment & MC14553 decade counter.when i give pulse to pin#12 of MC14553 the display shows counting unstable or once pulse gives counting of more than 1.
How can i do this that one pulse give only one count?
can i use 555 for this purpose?
also i want to use an optocoupler so that the interruption in optocoupler will give one count.
Please help me.
 

bertus

Joined Apr 5, 2008
19,939
Hello,

You will need a debouncing circuit.
This can be done by a NE555 as a monoflop.

Greetings,
Bertus
 
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