what is a relay driver ?

Relay Driver In a low power circuit or a output from a Microprocessor is very low. It is sufficent for a LED to glow but to drive a high load you will need a Relay (Electromagnet Switch), and to give proper voltage or current to a relay you will need a relay driver....

Transistor as a Switch

Aim of this project is to determine characteristic of a NPN transistor by varying base voltage and detect Cut-off Region and Saturation Region.
We have used a potentio-meter for varying Base voltage. After assembling the circuit use a digital multi-meter and scale mark the voltage. You can also attach a multi-meter permanently.

Touch Switch

We can protect our product or thing by making them touch proof or we can stop any unidentified persons entry in our house by making door and window touch proof. This circuit alert us when anyone come to stole products from our house or touch any metallic thing at door / window or in side

Solar Cell

The circuit illustrated here is used as Solar Cell. You can get plate from your old faulty solar calculator. Carefully dissemble plate with out tearing its 2 wire. Connect both wire to a LED through a switch. When Solar Plate is kept in sunlight and switched ON you will see LED glows .

Magnetic Switch

Here is a simple Electronic Switch which can be operated by any Magnetic Field.  It can serve purpose of REED Switch with little modification using a relay because it can not directly drive electrical loads as their output drive capabilities are very small around 10...

LED Driver

This lesson will teach you What are LEDs ? Why LED gets fuse or short (Damage) ? How to use LED in a circuit ? Learn about LED Driver. LED (Light Emitting Diode) are small light sources that become illuminated by the movement of electrons through a semiconductor...


Learn to make a AC Generator Simple Dynamo experiment This experiment shows Magnet +conductor+Motion=Current Make a coil of fine insulated wire wound on a plastic or cardboard tube. Connect the ends of the coil to a DC milliammeter or galvanometer (for demonstration...


Ni Cd Battery Charger The nickel-cadmium battery is a popular type of rechargeable battery for portable electronics and toys using the metals nickel (Ni) and cadmium (Cd) as the active chemicals. They are sometimes used as a replacement for primary cells, such as...