The figure shows how to control the blinking of a 5 V blinking LED with an LDR. The LED only blinks when the light is cut off. The circuit is from a Radio Electronics from October 1980.

The figure shows how to control the blinking of a 5 V blinking LED with an LDR. The LED only blinks when the light is cut off. The circuit is from a Radio Electronics from October 1980.