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  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

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ece_jm

New Member
countdown timer

guys,
I want to make a countdown timer with start/stop and reset buttons. Can anyone give me a schematic diaram please.
 

MrDEB

Well-Known Member
not sure if what U want?

I have a drag racing type start tree w/ 2 blue lights,3 yellow lights, a green light and one red light (per lane).
Built for pinewood derby racing. If you hit the "gas button" before the green light then the red light comes on. About 1 second between lights.Reset and go again
works real well
Look at 4017 circuits for simple count down circuits.
 
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