The project is designed to develop a time delay based switch to control any load. A 555 timer is utilized as a part of monostable mode to drive a relay to switch ON/OFF a load for fixed time duration.
A time delay based relay is a relay that stays on for a specific period of time once activated. This circuit is comprised of a simple adjustable timer circuit which controls the actual relay.
The time is adjustable from 0 to few seconds but can be increased by increasing the time constant of the mono-stable 555-timer. The current handling capcity limit of the load is restricted by the kind of relay utilized. The project is offered with a lamp as a load.