Self Activating Door Bell

Self activating doorbells are of very much use in the modern age. This is also known as magic eye or electronic eye. This can be used as a guest indicator at the door. This can also be used to warn us of the intruders as a burglar alarm. The circuit is easy to build and…

Read More

FIRE ALARM

In hot summer it is very much significant to supervise your home from fire. Here is a simple circuit of a fire alarm using the light bulb starter as the heat sensor. This circuit is powered by a 3V battery. Requirements: Starter 220ohm resistor UM66 8ohm speaker BC548 3v battery Connecting wire PCB (Printed Circuit…

Read More

Water Level Indicator

If you are tired of continuously monitoring the water level of the overhead tank of your house, then you can relax now by creating your own water level indicator. This indicator beeps whenever the water is in contact with the probe. This beeps continuously till you turn off the water pump. Requirements: 330k ohm resistor…

Read More

Simple Pocket Audio Amplifier

If you are an avid music listener and want to have a pocket amplifier of your own, then you can build your own pocket audio amplifier by using simple circuits. All you have to do is list down the components that are needed for the circuit and get them from a nearby electronic shop. It’s…

Read More