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Modified LED Chaser Design

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jar1087

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I am trying to build an LED chaser using 4017 decade counters and a 555 timer chip. My design is based on that from this website, with a few changes:

BOUNCING LIGHT - 9 OUTPUT UP-DOWN COUNTER

Instead of using 9 LED's, I wanted to use 12, which required a third 4017. I basically daisy chained it into the loop, so that now IC1 signals IC2 which signals IC3, back to IC1, etc. The connections from IC1 to IC2 and IC2 to IC3 are through transistors, like the IC1 to IC2 connection in the schmatic. The connection from IC3 to IC1 just runs directly, like that from IC2 to IC1 in the schematic I also added an on/off switch and removed the connection between pin 5 on the 555 timer and ground, as previously I was not getting any signal out of it. Now the circuit mostly works, but instead of only one light moving back and forth, there are three. They seem to run in the correct sequence, but I'm not sure how to fix it so that only one LED lights at a time.

Any suggestions?

Thanks in advance.
 

crutschow

Well-Known Member
Most Helpful Member
You need to post a schematic of your circuit so we know exactly how it's connected.
 

audioguru

Well-Known Member
Most Helpful Member
He posted the same questions but included the original article and his modifications to it on another website and said it didn't work properly.
Then he repeated his questions in another thread but did not include the original article. Then he deleted the wrong thread.
The CD4017 ICs are not reset when the power is applied.

I recommended Bill Bowden's circuit.
 
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