TRANSISTOR TIME DELAY RELAY CIRCUIT Objectives of this experiment: To construct transistor time delay relay circuit and verify its operation. The time-delay can be performed by connecting different values of capacitors at base of transistor. Once the transistor starts into conduction the current passes through the coil of relay and in turn turns on the relay. Built in regulated power supply: + 15V/300mA Input Supply: 230 VAC/50Hz mains operated. Dimension: 27cms x 17cms x 10cms. Weight: 500gms Qty :