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That is why I suggested that you connect U1/14 to pin 3 of the 555.audioguru said:The output of the LDR and transistor might be to slow to clock a high-speed TTL counter. Then a Schmitt-trigger circuit is needed to feed the counter.
You should be able to make it work with the TTL if you can't buy CMOS.cannibal said:If I used CD4026 all the problems will be solved ??!!
and how can I test only the counter circuit if it's working or now (Only counter circuit)
You're welcome. I'm glad that we were able to help.cannibal said:WOW WOW WOW WOW WOW
finaly the counter is counting perfectly
0,1,2,3,4,5,6,7,8,9
the breadbord hole where wire of pin1 to pin12 was defected
I used another hole in the breadboard to connect pin1 to pin 12
and thats it
counting with no problems
thank you very much ljcox
also BIG thanks goes to audioguru and all other members who'ed helped me
all the best
Of course. But most modern circuits use a microcontroller or Cmos ICs.cannibal said:Is it possible to make it count to 99?