POWER ELECTRONICS / SMPS
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Power electronics is the technology that deals with conversion of electrical power by electronic circuits. The devices that perform such conversion are referred to as power supplies although more accurate term for them would be power converters. Power electronics originated about a century ago with the application of grid-controlled gas-filled tubes for power control. The subsequent development of SCR, bipolar transistors and FETs revolutionized the industry and resulted in rapid expansion of power electronic applications. Most modern power supplies (except for linear amplifiers) are switching.  The control of power flow in switched mode power supply (SMPS) is performed with power semiconductors that are continuously switching on and off with high frequency. This site is power electronics information resource. Here you can find power electronics calculators, reference information, industry news, as well as career resources.
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SMPS information guide

Latest patents and applications in switching power supplies, regulators, and electric power conversion systems

Connectors and pinouts of computer power supplies

Power electronics blog
Magnetic units- conversion tables, equations and calculators

Power and energy units online conversion

Resistor color code calculator

Standard resistor values table
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