CONSTRUCTION OF SCR TRIGGERING CIRCUIT USING LDR Objective of this experiment: In this experiment the photocell (LDR) is used in conjunction with an SCR. The LDR triggers the SCR under proper conditions of light. The SCR in turn acts as a switch to turn the lamp that is Load either 'ON' or 'OFF' Built in power supply: (0-18) VAC/50 Hz. Input Supply: 230 VAC/50Hz mains operated. Dimension: 27cms x 17cms x 10cms. Weight: 500gms Qty :