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This is a simple 5volt power supply circuit using ic regulator type 7805. This circuit can be paired with Running LEDs circuit II in the Fun circuit category or even digital ic circuits. Input ranges from 8 Volts to 18 Volts DC. This circuit has a LED as an indication, if the power supply turns on.
A switched-mode power supply (switching-mode power supply, SMPS, or just switcher) is an electronic power supply that incorporates a switching regulator in order to be highly efficient in the conversion of electrical power. Like other kinds of power supplies, an SMPS transfers power from a source like the electrical power grid to a load (e.g., a individual computer) whilst converting voltage and current characteristics. An SMPS is usually employed to efficiently supply a regulated output voltage, generally at a level diverse from the input voltage. Unlike a linear power supply, the pass transistor of a switching mode supply switches very quickly (typically between 50 kHz and 1 MHz) between full-on and full-off states, which minimizes wasted energy. Voltage regulation is supplied by varying the ratio of on to off time. In contrast, a linear power supply should dissipate the excess voltage to regulate the output. This higher efficiency will be the chief benefit of a switched-mode power supply.
Well, the following circuit is a power supply circuit which build without transformer/transformator component inside the circuit (transformerless powersupply). This is a great way to get 20A current output power supply without transformer since 20A transformer is very-very expensive.
Schematic diagram:
PCB layout:
