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Joule thief
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A joule thief is a minimalist self-oscillating voltage booster that is small, low-cost, and easy to build, typically used for driving small loads, such as driving an LED using a 1.5 volt battery. It c
A conventional joule thief, showing components and how they are connected. This example uses a red LED. A ferrite toroid is wound to form a coil with
A conventional joule thief, showing components and how they are connected. This example uses a red LED. A ferrite toroid is wound to form a coil with primary (white) and feedback (green) windings. A PN2222A transistor and 1000 ohm resistor are used.
A joule thief with two axial inductors replacing the ferrite toroid, shown on a solderless breadboard
A joule thief with two axial inductors replacing the ferrite toroid, shown on a solderless breadboard
The waveform of an operating joule thief, showing a 30% duty cycle at approximately 40 kHz
The waveform of an operating joule thief, showing a 30% duty cycle at approximately 40 kHz
Switched-mode power supply
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A switched-mode power supply, also called switching-mode power supply, switch-mode power supply, switched power supply, or simply switcher, is an electronic power supply that incorporates a switching
Joule thief
…Forward converter – Type of voltage converter circuit Switched-mode power supply – Power supply with switching regulator Joule Thief simulation - archived 2021-05-01…
Stand-alone switched-mode power supply
Stand-alone switched-mode power supply
An adjustable switched-mode power supply for laboratory use
An adjustable switched-mode power supply for laboratory use
This charger for a small device such as a mobile phone is an off-line switching power supply with a European plug, mainly consisting of an opto-couple
This charger for a small device such as a mobile phone is an off-line switching power supply with a European plug, mainly consisting of an opto-coupler, a rectifier and two active devices.
Zero-voltage switched-mode power supplies require only small heatsinks as little energy is lost as heat. This allows them to be small. This ZVS can de
Zero-voltage switched-mode power supplies require only small heatsinks as little energy is lost as heat. This allows them to be small. This ZVS can deliver more than 1 kilowatt. Transformer is not shown.