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 supply and AC regulated power supply;
According to the connection mode of the voltage stabilizing circuit and the load, there are series regulated power supplies and parallel regulated power supplies;
According to the working status of the regulator tube, there are linear regulated power supplies and switching regulated power supplies;
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.
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 obtain 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 an electrolytic capacitor above 100 microfarads/16V from the 5V output terminal to the ground (the "negative" in the figure).