Circuit Diagram 7805. This open type arrangement is only suitable for a very low output current as the 7805 is not heatsinked. The circuit diagram of the 7805 voltage regulator is shown below.
And also it can be used as well as a dc to dc voltage converter. Normally the pin2 of the regulator ic is connected to the ground. This circuit diagram shows you how to make a 5v to 12v variable dc power supply from a fixed 5v regulator ic 7805.
7805 constant current batter charger circuit.
So it is recommended only priority is device specific. In power supplies variable power supply using 7805 description. Circuit diagram with parts list. Pin diagram of 7805 voltage regulator ic.