12V to 5V 7805 voltage regulator circuit diagram: connect as shown in the figure below. The heat sink is generally made of aluminum, but it can also be simpler. Both capacitors are needed. If there is no capacitor at the output end, 7805 will easily generate self-oscillation. If there is no capacitor at the input end, the voltage stored in the output capacitor will not be completely discharged at the moment of shutdown. When the input is powered off After that, the voltage at both ends of the input and output will be inverted, which is easy to damage the regulator.
Voltage stabilizing circuit: A circuit that can maintain a constant output voltage when the input voltage, load, ambient temperature, circuit parameters, etc. change. This circuit can provide a stable DC power supply and is widely used in various electronic devices.
There are many ways to classify regulated power supplies. According to the type of output power supply, there are DC regulated power supplies and AC regulated power supplies; according to the connection mode of the regulated circuit and the load, there are series regulated power supplies and parallel regulated power supplies; according to the adjustment tube Working status is divided into linear regulated power supply and switching regulated power supply; according to the circuit type, there are simple regulated power supply and feedback regulated power supply, and so on. Such a wide range of classification methods often make beginners confused and do not know where to start. In fact, it should be said that there is a certain level of relationship between these seemingly diverse classification methods. As long as this level is clarified, the types of power sources can naturally be distinguished.
Wiring
The 7805 is a three-terminal regulator integrated circuit with an output voltage of 5V. The wiring method is shown in the figure below:
In order to get a smooth DC output, it is recommended to connect a 100 microfarad/16V electrolytic capacitor from the 12V input terminal to the ground (the "negative" in the figure); connect the 5V output terminal to the ground (the "negative" in the figure) Connect an electrolytic capacitor above 100 microfarads/16V.
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