Transistor Relay Driver Circuit. Its mean uln3002 can drive up to seven relays at a time. It is used to switch high loads or loads that needs ac current to operate.
Uln2003 is a very famous relay driver integrated circuit. Thus you can calculate r as follows. It is used to switch high loads or loads that needs ac current to operate.
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.
Its contains seven darlington pair of a transistor which have high voltage and high current carrying capability. The following lists the input condition i e. 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. One of the serious problems in relay operated circuits is the relay clicking or chattering during the on off of the relay driver transistor.
