light activated led scr

Posted on Feb 5, 2014

The schematic shown below is a circuit of light activated LED using SCR. SCR (Silicon Controlled Rectifiers) or thyristor are physically looks like transistors but their internal circuit and working procedure is totally different as compare to the transistors. Both SCR and transistor can work as In this circuit the SCR is working as a switching de

light activated led scr
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vice. When the LDR will receive light its resistance will decrease which will switch on the SCR and the LED becomes activated. The 50K variable resistor is used to adjust the amount of light on which you want to switch on the SCR and activate the LED. The circuit can be operated with 6V battery or power supply.

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