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Sign up for Our Newsletter Name: This is the pin that gives out the regulated voltage, which, in this case, is 5 volts.

If you don’t have all the parts, don’t feel bad. How to Connect a Voltage Regulator in a Circuit In this article, we go over how to connect a voltage regulator to a circuit to get a specific DC output regulated voltage. The capacitor, in essence, acts as a bypass capacitor.

This produces a voltage of 9 volts. Keep in mind that the design of a voltage regulator depends on the voltage regulator being used and the intended use of a circuit. But if you’re going to have a varying load, a potentiometer, for instance, on the output, it is well advised to add an electrolytic capacitor in parallel to the ceramic capacitor.

The second capacitor, the 0. The regulator regulates this voltage down to 5 volts. Pin 1 is the Input Pin. The voltage regulator should always be fed as smooth of a DC signal as possible which gives the best regulated output so it can regulate it down to its specified voltage. Depending on the voltage regulator in use, we can get a regulated positive or negative voltage, at whichever voltage we want.


This electrolytic capacitor acts as a smoothing capacitor, when load resistance changes cause abrupt voltage spikes and drops, in a circuit. The first capacitor, the ceramic 0.

Remember, the input voltage has to be larger than the voltage that the regulator regulates out.

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When the load of a circuit is stable and unchanging, as in the example above, it is usually not necessary to add a large electrolytic capacitor on the output to act as a smoothing capacitor. The output voltage of whatever voltage source you want to regulate down whether it’s a transformer, battery, etc.

That’s why it’s a good idea to get into hooking up a voltage regulator properly from the sart. So for instance, if you have 10 volts coming from a transformer that you want regulated down to 5 volts, the output of the transformer the 10 volts is fed into the regulator input pin 1 so that the regulator can regulate it down to your wanted voltage 5 volts.

At the end of this experiment, when our circuit is hooked up, we’re going to read out the dayasheet with a multimeter and it should give out close to 5 volts. For now, you can just follow along. In this article, we use a positive voltage regulator, which outputs 5V, the LM regulator.

For a circuit like this, where we’re lighting an LED, it isn’t exactly crucial to have a pure DC signal, but in other applications, such as when outputting voltage to power a logic chip, which needs a precise voltage fed into it in order to give the correct logic output, it is crucial.

It shorts the AC signal of the voltage signal which is noise on the voltage signal to ground and only the DC portion of the signal goes into the regulator.


After it comes out of the regulator, the other capacitor, the 0. The circuit begins at the 9-volt battery.

It shorts this noise to ground and allows the pure DC signal into the regulator. Now this DC voltage, clean and crisp, is ready to power whatever you want it to, in this case, the load 78009ct a resistor and a LED. Therefore, it has a smoothing effect and even things out. More will be on this for more advanced projects, but this page is a good start for those starting off in connecting voltage regulators for basic circuits.

How to Connect a Voltage Regulator in a Circuit

In this article, we go over how to connect a voltage regulator to a circuit to get a specific DC output regulated voltage. Okay, so let’s recap on the circuit.

Always consult the Manufacturer’s Datasheet for the voltage regulator in use for a circuit to see how to hook it up with the necessary required external components. Before we can hook up the circuit, let’s first go over the pinout diagram of the voltage regulator, which is vital for hooking up the circuit. This capacitor is there to filter out any noise coming from the voltage source the datashheet.

You can buy them at anytime and come back to this page and do the experiment anytime.