headache for using 7474 to design counter

[MRFGUY]

counter with 7474

I am facing sometime my counter is stuck at 0 during simple 3bits upcounter by using 7474 IC.

After I reconnect again. It is work. It is happen quite often. So I need to clearify myknowledge.

Normally I connect all PREset pins to VCC and all CLeaR pins to switch. When ever switch on the counter will run from 000o 111.

 

[amrstaha]

What do you mean by reconnect?
I suggest you check your clock source.
The CLR switches should be pulled high through a resistor (10k for example)and shouldn't be left floating.

Good Luck

 

[z81203]

try Q~ or Q with inv connect next D.