I am trying to make a circuit to flash LEDs on and off using a 555 timer and a CMOS 4017B decade counter chip. Whenever I try to connect one LED to two of the outputs in parallel, all the outputs start going high at the same time - the chip has stopped counting. I have tried separating the two outputs with diodes and pulling all unused outputs down to 0V with diodes but nothing fixes the problem. Can anyone help?
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4017B Decade Counter
in Electronics chit chat
Posted
I am trying to make a circuit to flash LEDs on and off using a 555 timer and a CMOS 4017B decade counter chip. Whenever I try to connect one LED to two of the outputs in parallel, all the outputs start going high at the same time - the chip has stopped counting. I have tried separating the two outputs with diodes and pulling all unused outputs down to 0V with diodes but nothing fixes the problem. Can anyone help?
Thanks
Paul