Simple Light Actuated Relay by Phototransistor

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 Photo transistor Only. The important part of the circuit is very low cost. (I like it)
The photo transistor is very sensitive to light. VR1 for control sensitive of circuit.
Relay used 6V to 9V 600ohm.

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