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Reply to "Semaphore and 555 Timer Circuit"

I'm using a DC power supply, 30 VDC 5 Amp from Banggood powered by an external power supply that was listed with this item back when I got it. It was more than their minimum recommendations to get the 30 volts and 5 amps out of it, I believe I upsized it one size to be sure.

Yes, basically the same schematic except I changed the 470 ohm resistors to 220 ohm and made some cosmetic adjustments for neatness. I'll attach the most current one with the resistor value changes just to be sure. I didn't catch the resistor value errors or the suggested power supply input voltage until I got the PCBs back.

This was all working on a breadboard using the same power supply, but with a 9 or 12 volt supply voltage. I was using the CD4070 ICs instead of the 74AC86s because I had to order those and had the 4070s.

Here's the updated and latest.

4-Way Traffic Signals CA-CC 74AC86

I rechecked it all again and it still appears to be correct, I must be missing something? Even tried it with the 74AC86s removed, still got 1.18 volts on the 4017's VDD pin, but get 5 volts (full supply) on the VDD socket with the 4017 removed. I'm going to get out a new 4017 and try that later tonight or in the AM, was wondering if maybe something was wrong with the IC?. 

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  • 4-Way Traffic Signals CA-CC 74AC86
Last edited by rtr12

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