Objectives of this experiment:
1. To construct relay circuits using given three photo devices (light dependent resistor (LDR), photodiodes, photo transistor).
2. To observe the operating voltage of any relay.
3. To observe the relation among light sensitive components.
4. Relays are widely used in industrial applications.

Built in regulated power supply: +15V/300mA
Input Supply: 230 VAC/50Hz mains operated.
Dimension: 27cms x 17cms x 10cms.
Weight: 500gms