The 555 timer integrated circuit makes for an easy high or low (on or off) output circuit. Set with light dependent resistor (LDR): For the demonstration circuit shown in the diagram… A bright enough light falling on the light dependent resistor (LDR) sets the output high. Pin 2 (trigger) requires a low input signal (1/3 … Continue reading "555 timer bistable mode flip flop circuit learning electronics lesson 0011"