jbelectric777
Member
ok, i followed the previous instructions but it still didnt work, so i'm gonna tell ya what i have and maybe i'm missing something.....
i have a ne555 pulse timer working fine, i want that to drive the decade counter so the led's turn on and off from 0-9 i hooked the timer output to 14, 12 wasnt used, 13 & 15 tied to zero along with 8 and 16 was connected to Vcc. then what i did was tap the clock input with zero (because the 555 pulses 0) and hooked up one led just to see if it would light up and it didnt. do i need all my 10 outputs hooked up ? i understand the outputs go high so is a zero output from the 555 ok? maybe the zero terminals need resistors? any help appreciated, thanks, jim
i have a ne555 pulse timer working fine, i want that to drive the decade counter so the led's turn on and off from 0-9 i hooked the timer output to 14, 12 wasnt used, 13 & 15 tied to zero along with 8 and 16 was connected to Vcc. then what i did was tap the clock input with zero (because the 555 pulses 0) and hooked up one led just to see if it would light up and it didnt. do i need all my 10 outputs hooked up ? i understand the outputs go high so is a zero output from the 555 ok? maybe the zero terminals need resistors? any help appreciated, thanks, jim