Schematic DIY KitSwitching Power Supplies Power supplies with very high efficiency
Unlike linear regulators, which have a relatively low efficiency, switching power supplies can efficiencies of 90 percent or more. This makes them a good choice for all applications where high currents are required in limited space.
Moreover, it is easily possible with switching power supplies to obtain higher voltages than the input voltage (Step Up controller), or even a negative output voltage to generate.
Here are some links to switching power supplies

Here you will find Schematic Circuit Diagram for DIY and further information on Switching Power Supplies
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Low Voltage Step-Down Regulator, 3.3 V to 1.2 V up to 1A. Very well
described.
www.amplifier.cd/Technische_Berichte/Buck/LTC3411_Schaltregler.htm
Small effective switching power supply, depending on input voltage 5-40V 2.5 A www.kreatives-chaos.com/index.php?seite=schaltnetzteil

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