LED (Light Emitting Diode) is a semiconductor light emitting diode. We know that diode allows the current in one direction and does not allow the reverse current which will affect the components in the circuit. LED also do the same function but will emit a small light when it allowed the current, which will give […]
IR Remote Control Switch
This circuit is low cost and can be constructed easily. By using this circuit, we can control any house hold appliance with the help of remote. In this project, there are two parts – one is in transmitting section and the other is in receiving section. Receiving section will be in a stable position which […]
Car Parking Guard Circuit Using Infrared Sensor
Introduction: While parking the car the driver should be more careful because he cannot see the back of the car while parking or taking reverse, if there is any obstacle and ran over it might be get damage to the car. Our project will help the person in the driving seat and give alarm if […]
Continuity Tester With Melody
A continuity tester is a device which tests the continuity of the wire at hand. It is an indispensable tool to check broken wires and undesired shorting of wires. If we want to check if the wire is connected from one end to another, then use the probes of the continuity tester and put to […]
Automatic Door Bell With Object Detection
We all have a doorbell at our homes. When a visitor comes to our house, he searches for the doorbell switch and then rings it to let us know his presence. If the who came to our house cannot find the doorbell or else if the person is so short that he cannot reach the […]
555 Timer as Schmitt Trigger
Schmitt Trigger The high and low transitions on the inputs of most of the CMOS devices should be fast edges. If the edges are not fast enough, they tend to provide more current and this might damage the device. Analog signals are generally not perfect and might not have clean edges all the times. Schmitt […]
Astable Multivibrator Using 555 Timer
Circuit and Operation Astable multivibrator is also called as Free Running Multivibrator. It has no stable states and continuously switches between the two states without application of any external trigger. The IC 555 can be made to work as an astable multivibrator with the addition of three external components: two resistors (R1 and R2) and […]
Monostable Multivibrator using 555 Timer
Circuit and Operation The following figure is the schematic of IC 555 as a Monostable Multivibrator. This is the basic mode of operation of the IC 555. It requires only two extra components to make it work as a monostable multivibrator: a resistor and a capacitor. As the name specifies, a monostable multivibrator has only […]