Electronic Night Light

Posted on Nov 12, 2012

This circuit was submitted by Adam from Canada who is still at school. I have provided the text. The two transistors are used as a direct coupled switch, Adam used 2SC711 but any general purpose transistor will do e.g. 2N3904, BC109C.

Electronic Night Light
Click here to download the full size of the above Circuit.

The CDS photocell, type ORP12 is normally illuminated, therefore its resistance is low. The 50k control, the 1k resistor and the photocell form a potential divider which biases the first transistor. This transistor is on, its collector being held low,

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