Tri-colour led torch design

Thread Starter


Joined Feb 7, 2020
Hello.l am doing an electronic project in which l am tasked to design a rechargeable led torch circuit and make one.the torch shud have 3 aspects White,Green and Red which should light separately . I am stuck on the switch. I need to use either one normally open push button or 3 push buttons.l am having challenges especially on the switch. l am looking for a circuit that include the switch/switches (normally open push buttons)

Audioguru again

Joined Oct 21, 2019
I would use a CD4017 or 74HC4017 counter/decoder set to count to 4: White, Green, Red then Off.
The counter IC can drive transistors to turn on the LEDs.
A single momentary pushbutton can do it but its contacts must be filtered to prevent contact bounce from causing many activations during each push.