Switching Transistor. Then to summarise when using a transistor as a switch the following conditions apply. The main reason behind using this transistor for the purpose of the switch is that the current at the base controls the current present at the collector directly.
When base voltage is present the switch is on. One of the most common uses for transistors in an electronic circuit is as simple switches. We control traditional switches manually by applying a mechanical force.
In short a transistor conducts current across the collector emitter path only when a voltage is applied to the base.
The circuit is designed by using a transistor as a switch to light the bulb in a bright. When the switch is closed base current starts flowing through the transistor and then drives into saturation results to. One important component in the circuit of a heat operated switch is the thermistor. A voltage or current applied to one pair of the transistor s terminals controls the current through.
