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Tuesday, August 25, 2009

Simple Mini Night Lamp Circuit Using Battery

This is the simple circuit of mini night lamp. This is a circuit with low power LED night lamp. This circuit will automatically switch OFF at day time. This circuit is based on CMOS IC in the operation. This is the figure of the circuit.


The CMOS timer IC TS555CN is wired as a square wave generator operating at around 5Hz. The IC1 must be CMOS type because other types won’t operate at low voltages like 1.5V. The output voltage from the IC1 is doubled using the combination of capacitor C2 and diode D2 in order to drive the LED. The LED can be a bright white LED. At day time the resistance of LDR drops to few K Ohms and inhibits the IC from producing oscillations. The circuit can be powered from a single 1.5V cell. An optional switch can be added in series with the battery to provide a manual ON/OFF. Any diode can be used in place of D2, but Schottky diode like 1N5819 will give more brightness.

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