I want to build a latching switch circuit with transistors (no relay). It needs to remain on after pressing a momentary contact switch and shut off when power is switched off. I would like to use as few components as possible.
I tried the circuit on the link below, but the circuit goes on and stays on when power is applied without pressing the momentary contact switch. The switch has no effect. Can someone tell me why this circuit doesn't work? I used 2N4424 NPN transistors. I checked all my wiring.
http://www.zen22142.zen.co.uk/Circuits/Switching/latch.htm
I tried the circuit on the link below, but the circuit goes on and stays on when power is applied without pressing the momentary contact switch. The switch has no effect. Can someone tell me why this circuit doesn't work? I used 2N4424 NPN transistors. I checked all my wiring.
http://www.zen22142.zen.co.uk/Circuits/Switching/latch.htm