Joule thief is a nickname for a minimalist self-oscillating voltage booster
that is small, low-cost, and easy-to-build; typically used for driving
light loads. It can use nearly all of the energy in a single-cell electric battery,
even far below the voltage where other circuits consider the battery
fully discharged (or "dead"). Hence the name suggests the notion that
the circuit is stealing energy or "Joules" from the source
The circuit uses the self-oscillating properties of the blocking oscillator, to form an unregulated voltage boost converter. As with all power conversion technology, no energy is actually created by the circuit. Instead, the output voltage is increased at the expense of higher current draw on the input. As a result, the amount of power entering the circuit is the same as the amount leaving, minus the losses in the conversion process.
The circuit uses the self-oscillating properties of the blocking oscillator, to form an unregulated voltage boost converter. As with all power conversion technology, no energy is actually created by the circuit. Instead, the output voltage is increased at the expense of higher current draw on the input. As a result, the amount of power entering the circuit is the same as the amount leaving, minus the losses in the conversion process.
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