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0 99 counter circuit (74157 with timer)

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absf

absf

Joined Dec 29, 2010
1,968
balkan said:
when i restart the supply its change. right one count 1 3 5 7 9 left one sometimes count odd sometimes stuck at 4 not stable
Click to expand...
(Based on the schematic on post #18)
I suspect that either U1 pin 3 or U4 pin 2 are permanent at High. Are these 2 pins shorted to +5V? Or maybe one of the chips is bad.

Allen
 
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