Build a Simple Circuit from a Pizza Box (No Soldering)

This would be a great way to create student operation games without having to solder! I think that grade students would love to try this out.

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New LDR Pre-amplifier Kickstarter Campaign | Hifi Pig

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Automatic LED Emergency Light Circuit using LDR

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Using Photoresistors | Use a photoresistor to sense light with the Arduino - CLICK HERE for Tutorial https://arduino-board.com/tutorials/photoresistor

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This simple circuit can be used as an automatic bathroom lamp controller. It disables the bathroom lamp at daytime and enables it at night. The circuit is built around a light-dependant resistor (LDR1), reed switch (S1), two transistors BC547 (T1) and SK100 (T2), a 12V 1-change over (C/O) relay (RL1), a step-down transformer X1 (12V-0-12V, …

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