Three-terminal voltage regulator, that is, only three pins, respectively for the input end, output end and ground (common end), according to the function can be divided into fixed voltage regulator circuit and adjustable voltage regulator circuit, fixed is the output voltage is fixed, and adjustable can be through the external component to make the output voltage to get a wide range of regulation.
The three feet of the three-end regulator are the input end, the ground end, and the output end. The three feet of the L7805 voltage regulator integrated circuit, the pin down, literally towards themselves, the first foot on the left side is the input end, the input voltage 8-15V, the middle foot is the ground foot, and the right foot outputs 5V voltage.
Functions are as follows:
< br >
1. Input pin (Vin) : receives the input signal of the DC power supply to be stabilized.
< br >
2. Output pin (Vout) : Output a regulated DC voltage signal.
< br >
3. Ground (GND) pin: connected to the ground wire of the circuit board, used to provide a stable reference potential.