As you probably know, the USB 2.0 ports can broach up to 500 mA, that means about 2.5W. But infrequently you may need more power to link up an outmost HDD or other peripherals and the USB ports only cannot broach sufficient current. In this box you can purchase USB hubs that have an outmost power adapter compulsory to speed up the power or you can erect a elementary or intricate route that can do the same thing.
There are many projects existing on the internet, a few of them are really complicated, others are elementary as using a few components. One elementary design involves the use of the 7805 voltage regulator that can broach 5V and 1A.
Circuit No 1
I have found this design on Electronics For You website and it uses the 7805 regulator, a MOC3021 optoisolator as principal components. ( source )
Circuit No 2
This is other design that uses LM2575-5 step-down switching voltage regulator. Its element is that inner power transistor switch on and off according to a feedback signal. This chopped or switched voltage is converted to DC with a tiny amount of sputter by D1, L1 and C2.
Circuit No 3
This route is the simplest one. It uses the 7805 and can broach 1A.
Circuit No 4
It uses the same 7805 but with 2 outmost transistor it can broach up to 3 amps, that is 15W of power ( source ).
Of march you will need an outmost adapter to power up this circuits, something similar to a 12V DC adapter. What do you think?
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