T tim New member Sep 23, 2010 #1 I want to build a circuit with a flashing led sign using a 555 timer. Now to control the speed of the flashing could I use a potentiometer? And what kind of transistors should I use if I have more than 20 leds?
I want to build a circuit with a flashing led sign using a 555 timer. Now to control the speed of the flashing could I use a potentiometer? And what kind of transistors should I use if I have more than 20 leds?
