By making a simple circuit, old batteries can be used for lighting!
The circuit's name is Joule Thief, and is made up from only 3 simple components, the old battery and a bright LED.
The old battery gives under 1 volt instead of 1.5, and it is useless for most electric devices.
The circuit's name is Joule Thief, and is made up from only 3 simple components, the old battery and a bright LED.
The old battery gives under 1 volt instead of 1.5, and it is useless for most electric devices.
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