The Circuit Diagram of Ultra Low Consumption Battery Powered Lamp

Many purpose of this circuit usages, the plus point of this simple circuit are low consumption of current, work in 1.5 voltage DC volt, and can run for about 3 months continuously on an ordinary AA sized cell or for round 6 months on an alkaline type cell. With adding the photo resistor circuitry, running time will be doubled or very likely triplecated. In order to ensure the minimum battery consumption, one 1.5V cell is used and simple voltage doubler drive a pulsating ultra bright LED with current consumption less than 500uA. An optional photo resistor will switch off the circuit when daylight allowing further current economy. Parts:

R1,R2————————————————————1M 1/4W resistors

R3—————————————————————-47K 1/4W resistor

R4—————————————————————-photo resistor

C1—————————————————————-100nF 63V polyester capacitor

C2—————————————————————-220uF 25V electrolytic capacitor

D1—————————————————————-LED 10mm ultra bright

D2—————————————————————-1N5819 40V 1A schootky barrier diode

IC1—————————————————————7555/TS555CN CMOS timer IC

B1—————————————————————-1.5V AA/AAA type cell

In the circuit, IC1 generate a square wave about 4Hz frequency. C2 and D2 form a voltage doubler, necessary to raise the battery voltage to peak value able to drive the LED. IC1 must be CMOS type IC because only this device can be safely operate at 1.5V or less. If the usage are not needing photo resistor, omit R3 and R4 and connect pin 4 of IC1 to positive supply. You can also change the schottky barrier type using ordinary 1N4148 type diode, but the LED intensity will be reduced due to the higher voltage drop.

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Low consumption battery lamp

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