The block shown in the figure, although it is known to many readers, is not always in everyone's memory completely. It is possible to obtain a current greater than 1 A from any 78XX series regulator, depending only on the transistor used. For a TIP42, for example, we can easily reach 3 A, as long as it is mounted on a good heat radiator. The 3-ohm resistor determines the current in the regulator, which should be around 0.2 A. Eventually, this value must be decreased to obtain a greater excitation of a lower gain transistor and higher output current. The voltage regulator circuit must also be mounted on a heat radiator. Integrated circuits of the series, between 7805 and 7824 can be used, always remembering that the input voltage must be at least 2 V higher than the desired voltage at the output.
