Transistor Relay Driver Circuit. The following lists the input condition i e. Uln2003 is a very famous relay driver integrated circuit.
Its contains seven darlington pair of a transistor which have high voltage and high current carrying capability. You can calculate a limiting resistors r from the input voltage and current. The following lists the input condition i e.
The basic transistor relay driver circuit is shown in fig.
Here the ground refers to the negative line for an npn and the positive line for a pnp bjt. During the transition of light temperature levels the relay clicks which may cause sparking of contacts. Normal transistor relay driver circuit. 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.
