Transistor Switch Circuit For Relay. The values of the resistors are 3 3k for the base resistor and 1 8k for the bias resistor. Contol high voltage lamps motors and heaters.
We need a device that can boost the current provided by the digital output pin to drive the relay coil. That device is a transistor. You are watching simple diy video about how to use transistor as relay the purpose of this circuit is to save the time micro or milli seconds which relay i.
The following diagram depicts the transistor relay switch circuit with a voltage divider at the base of the transistor switch.
Practically we used mostly relays for high current demanding loads. Transistor as a switch a transistor is used for switching operation for opening or closing of a circuit. The following diagram depicts the transistor relay switch circuit with a voltage divider at the base of the transistor switch. Contol high voltage lamps motors and heaters.
