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http://pbelectronique.com/site/index.... Assortment of voltage regulators: https://amzn.to/3bL52dY A voltage regulator is a very useful component, because it allows you to provide the most common voltages such as 3.3V, 5V, 12V, 15V... A voltage regulator looks like a transistor. There are different types depending on the power you want to use. The most common are those built in TO-92 and TO-220 "packages". Obviously, TO-220s have a higher power since they can generally support up to 1A. Voltage regulators are also very useful when using batteries since if, for example, you use a 9V battery and use a 5V regulator, the circuit will maintain its operating voltage constant even if the input voltage varies somewhat. Thanks to the regulator, the circuit will maintain a constant voltage of 5V as long as the energy supplied at the input by the battery is sufficient to maintain this constant voltage at the output of the regulator. It is especially important not to forget to associate the capacitors whose role is to adjust the voltage. This is particularly important for all projects that require the use of microcontrollers. We can calculate the heat dissipated by the regulator using the following formula: (Vin - Vout) X Iout = Power (Watts) (in heat) Ex: (16V - 5V) X 0.3A = 3.3W of heat Vin: Represents the input voltage in Volts Vout: the output voltage in Volts Iout: the current of use at the output of the regulator expressed in Amperes. The Power is the power dissipated in the form of heat. This calculation allows you to know whether or not to add a heat sink to your regulator.