The basic differences between linear power conversion where essentially all excess energy is released as heat and switch mode converters where regulation occurs through pulsed regulation are discussed in this video. Key terms such as efficiency, dropout voltage, output ripple and EMI or noise are also addressed.
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DF Robotics Linear Regulator Eval Board – https://www.digikey.com/product-detail/en/dfrobot/DFR0140/1738-1057-ND/6588479
DF Robotics Switch Mode Power Supply Eval Board – https://www.digikey.com/product-detail/en/dfrobot/DFR0205/1738-1069-ND/6588491