A Time Delay Light switch circuit

This circuit is useful to illuminate locations where a light source of low power is needed. A closet, a car trunk, are good examples.

Flashing Lights for Pedestrians made 4011B IC.

This is a simple circuit that uses high-intensity white LEDs that turn on and off continuously. It may be placed in any part of the body such as an arm.

Police Style Strobe Light Circuit.

This circuit shows the familiar lights which are used on police cars. It uses a 555 timer as a clock for the 4017B decade counter, two transistors and twelve LEDs

Doorbell for Deaf People.

When a deaf person is alone in a house, it would be very difficult to realize that someone is knocking on the door without any visual warning signal.

The main component for the Doorbell for the deaf circuit is the CMOS 4001 integrated circuit, which has four two input NOR gates

Light-Emitting diode connected to 120/240 VAC Caution: This circuit is connected directly to the power line (120 / 240 volts AC), so you must take special care to test it. This circuit shows one or two LEDs (Light-Emitting Diode) directly connected to the outlet (120 VAC or 240 VAC). The reduction of the AC input voltage to […]