Pnp Transistor Relay Driver Circuit. Included are the following. You may recall the tlc555 relay driver circuit that i recently posted it too is a low side driver.
In case of npn transistor as shown in fig when v1 is 0v or turn off then base current ib will not flow due to which transistor remain in cut off region and hence ic will not flow and relay coil remain de energized but when base current ib is provided sufficiently the maximum amount of collector current starts flowing which. The relay will be actuated when the input of the circuit goes high. The following lists the input condition i e.
We will use the most widely used pnp transistor for our circuit the 2n3906.
The battery voltage and all other voltages and currents. Importance of relay relays are. Here the ground refers to the negative line for an npn and the positive line for a pnp bjt. The pnp transistor like almost all transistors is a 3 lead device.
