Circuit Project Electronic

This is the DC switching regultor Voltage 5V at current 3A. It is make for digital circuit.
The important part of the circuit is LM2673, it is 3A Step-Down Voltage Regulator with Adjustable Current Limit. View Circuit
The LM2673 is Simple and easy to design with using off-the-shelf external components.
please see circuit diagram and read more source.
http://www.national.com/pf/LM/LM2673.html
Related [...]

When i want 5V switching regulator (mini project),so i am used input is 9V battery.
The good circuit for work is the IC LT1073-5 (see detail in www.linear.com), it out put 100mA current.
The zener diode is 1N5818,L1 = 100uH
Detail more please see in image.
Related Links
More Circuit about Switching power supply
More Circuit [...]

If you require more than 1 amp, the 7805 can be combined with other components to provide an output of up to 3 amps, with the circuit below. The current is switched through the TIP2955, so the 7805 can be run without a heatsink since it only regulates the voltage. Note the 3-amp diodes in [...]