Robo India in this tutorial explains how to use transistor as switch.
1. Introduction:
Transistor can be used for many operations eg. amplification, switching etc. Here in this tutorial transistor is being used a switch.
A transistor has got three terminals Collector, Base and Emitter. If Base is trigged with some voltage, It allows current to pass from collector to emitter. It supports upto 500ma current. This phenomena is used for switching.
Download Datasheet of 2N2222 Transistor.
1.2 List of parts
Following parts will be used to perform this circuit.
| S.No. | Item | Quantity |
| 1. | Basics of Electronics Kit’s Platform(Without Transformer) | 1 |
| 2. | 9V Battery with connector | 1 |
| 3. | Indicator LED | 1 |
| 4. | 1 K Resistance | 2 |
| 5. | Jumper Wires male to male | 6 |
| 6. | 2N2222 Transistor | 1 |
2. Circuit
This circuit explains how to use transistor as a switch. Here as discussed above the base is being trigged by push button. If there is a circuit where input can be taken from IC or microcontroller then attach that input to base instead of Push button. Here in the circuit diagram 9V battery is used, You may use DC power supply with help of transformer. Click on image to zoom.
3. Resources:
Rectifier Circuit if you want you use transformer instead of battery.
Download Datasheet of P2N2222 Transistor.
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