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Series Connected Voltage Boost Circuit for a Battery Operated LED Lantern

Photo. This is the test circuit -the basic driver is only two transistors, two resistors, the circuit was evaluated using a white LED, but when it was time to button it up and archive it, I replaced the expensive white LED with a cheap green one. Othere LED Driver Circuits on this site: White LED drive from 1.5V White LED inductorless drive from 1.5V and 3V. Fast precision LED driver White LED Stroboscope W ...

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Single and Two Cell White LED Drivers Without Inductors

Three inductor-free circuits that allow a white LED or UV LED to be driven from one (1.5 volt) or two flashlight cells (3 volts total) are described. The circuits on this page are: The two cell (3 volt) circuit four transistors. The simple single cell (1.5 volt) circuit requires six transistors, but it isn't as bright as the two cell circuit. The higher output single cell (1.5 volt) circuit requires 13 tran ...

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1 Watt White LED Power Supply Circuit for battery operation

Download FreePC project file, gerber and png copper and silk-screen: 1wattledbuck.zip Introduction I have some 1 watt warm white LEDs left over from a project and the application for them was obvious: A better battery operated lamp for use when the power fails, which it does frequently, especially during the rainy season. And this one should cast enough light with which to read without a lot of strain. The ...

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Battery Checker Circuits using microcontroller

The "Battery Good" checker. When the button is pressed, the green LED will glow if the battery voltage is above the preset threshold. This version has a higher parts count than the "Battery Low" version, but a bonus is that it can drive an LED to  be very bright, and the luminance is independent of the battery voltage. The simple expedient of a jumper wire on the back of the board made it unnecessary to hol ...

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Simple Automatic Battery Discharge Analyzer using ATmega48 microcontroller

The project allows you to analyze characteristics of unknown/junk battery especially the capacity and variation of the voltage on discharge. It is controlled with a PC via a serial port. No external power supply is required because it is powered by RS-232C signals. It uses ATmega48 as main controller for dummy load and constant current circuit. For measurement of battery voltage, four-wire method is used to ...

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The simple joule thief using AVR microcontrollers

The Joule Thief is such an easy and simple device, but what it does is amazing. It can use a battery that is not usable in any other electronic device and give it life again. It can even take a battery that won't even power a basic LED by itself when it is brand new (1.5 volt AA) and amplify the power so that it can. This "Joule Thief" circuit, using a battery that won't work in any other device, can power ...

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Rechargeable Battery Capacity Tester using ATMega168 microcontroller

Do you have a pile of AA rechargeable batteries in your drawer? Some are old, some are new, but which sets would you bring with your camera on your next trip, and which ones are past their useful life? I like using rechargeable batteries, but I’m certain that some of them are not living up to the stated capacity on the label. So how good are those batteries? Simple battery testers measure the voltage, but t ...

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