marcy

I want to build a circuit where when I push and hold a momentary contact switch led's light up one at time and stay lit until all 40 are lit and the button is released. I built a circuit using 4017 decade counters but, they come on one at a time and don't stay on. I was wondering if I could use shift registers? Or if it would be better to use a pic. Any suggestions would be greatly appreciated

Please don't post the same thing over and over.

https://www.electro-tech-online.com/threads/led-light-display.102944/#post838750

If I asked you the same question three times would the answer be any different the third time than the first or second time, except you might say I've already told you?

Maybe we should start giving random answers on second and third duplicate threads.