Transistor Relay Driver Circuit Pdf. The simple transistor driver circuits of a and b are very low. B we ve added ammeters to measure the base and collector currents as well as voltmeters to measure the voltage across the transistor and the relay coil.
Here the ground refers to the negative line for an npn and the positive line for a pnp bjt. The basic transistor relay driver circuit is shown in fig. B we ve added ammeters to measure the base and collector currents as well as voltmeters to measure the voltage across the transistor and the relay coil.
Instead the computer circuit controls the driver transistor and the transistor does the heavy work.
B we ve added ammeters to measure the base and collector currents as well as voltmeters to measure the voltage across the transistor and the relay coil. Relaydrv pdf 2 resistor r3 can be much larger than for the transistor driver circuit but want to make the relay. The microcontroller provides high or low input signals to npn transistors. Instead the computer circuit controls the driver transistor and the transistor does the heavy work.
