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# emergency

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plz give me the ckt diagram of LED traffic signal and answer my question:
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well i want to make LED traffic signal with the help of 555 timer IC ,i know thte function of mutiplexer,decoder etc. i know the logic how to operate the LEDS but as i am a beginner in the field of electronics so i want to ask that i want to give for example 0 1 logic for RED LED and 0 0 logic for green led .So how can i give this input logic to decoder .0 0 or 0 1 or 1 0 or 1 1.

how this binary input can be given .
plz reply

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Aslam O Alaikum Fasieh

For avery simple demo you can use cd4017 decade counter IC with 555.  Also google, you will find many.

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i know the logic how to operate the LEDS but as i am a beginner in the field of electronics so i want to ask that i want to give for example 0 1 logic for RED LED and 0 0 logic for green led .So how can i give this input logic to decoder .0 0 or 0 1 or 1 0 or 1 1.

how this binary input can be given .Plz explain this plz reply to my address  mohdfasieh@yahoo.com

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Salam Fasih

How are you!

It seems you have 1to4 mx. I don't know what is your exact need as you havn't told one. Where you are using it.

However a 2 bit binary counter connected to select inputs should work. counter have to have a pulse from 555. Flip flops can also be configured as counters.

Also I told you about CD4017 which has built in counter+mux.

Regards

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