Schematic
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A schematic, or schematic diagram, is a designed representation of the elements of a system using abstract, graphic symbols rather than realistic pictures. A schematic usually omits all details that a
Photomicrograph of the human chromosomes
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
Schematic
…possible to make the map practical. Electrical and electronic industry Comparison of pictorial and schematic styles of circuit diagrams Example of a joule thief circuit driving an LED. In electrical and electronic industry, a schematic diagram is often used to describe the design of equipment. Schematic diagrams…
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
The waveform of an operating joule thief, showing a 30% duty cycle at approximately 40 kHz