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problematic counter....

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zanklob

New Member
guys i need your help..

i built a counter and although it works fine on multisim
it doesn't count right in the raster..

i have the circuit down here..

the only changes i made is that i used an 74ls193 instead of a 74ls192
and that in order to the pulse i put in and out a wire..

if someone has a clue please help..because i should have finish the project two weeks ago...
 

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zanklob

New Member
mike i looked at the datasheets and they are the same...

the raster is the thing i plug in the chips and the wires and the 7segment..
 

Roff

Well-Known Member
guys i need your help..

i built a counter and although it works fine on multisim
it doesn't count right in the raster..

i have the circuit down here..

the only changes i made is that i used an 74ls193 instead of a 74ls192
and that in order to the pulse i put in and out a wire..

if someone has a clue please help..because i should have finish the project two weeks ago...
When you use a switch, or touch a wire to a voltage source, contact bounce will occur, generating several transitions each time. You have to debounce your input. You will also need a pullup or pulldown resistor.
 
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sheldonstv

New Member
this circuit here shows how to debounce a switch(spdt-single pole double throw)to provide clean clock signals using a 4093(2 gates,the switch and two pull up resistors)gates u 1 and u 2 are the set reset latch.........
 

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