6V to 12V Converter by transistor
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This inverter circuit can provide up to 800mA of 12V power from a 6V supply. For example, you could run 12V car accessories in a 6V (British?) car. The circuit is simple, about 75% efficient and quite useful. By changing just a few components, you can also modify it for different voltages.
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Source :: http://www.electronics-lab.com/projects/power/014/index.html
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