Simple Light Actuated Relay by Phototransistor

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The Sun - Up Relay Switch can be used to provide a audible switch for when the sun comes up. It can also be used to detect a light beam, headlights etc.
This circuit is easy because it used one Transistor 2N2222-2SC945-2SC828-BC549 etc , Relay and Pototransistor Only. The important part of the circuit is very low cost. (I like it)
The phototransistor is very sensitive to light. VR1 for control sensitive of circuit.
Relay used 6V to 9V 600ohm.

Other detail please see to image circuit.

This entry was posted on Thursday, May 1st, 2008 at 8:42 am and is filed under Lighting. You can follow any responses to this entry through the RSS 2.0 feed.