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This electrolytic capacitor acts as a dahasheet capacitor, when load resistance changes cause abrupt voltage spikes and drops, in a circuit. This produces a voltage of 9 volts. The regulator regulates this voltage down to datasbeet volts.

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.

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. We don’t want any ac noise ripple imposed on the DC line voltage.

But if you’re going to have a varying load, datashet potentiometer, for instance, on the output, it is well advised to add an electrolytic capacitor in parallel to the ceramic capacitor.

That’s why it’s a good idea to get into hooking up a voltage regulator dtasheet from the sart. The capacitor, in essence, acts as a datasheeet capacitor. This is the pin that gives out the regulated voltage, which, in this case, datashheet 5 volts. 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.

Pin 2 is Ground. In this case, we are using a LM, which outputs 5 volts. 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. The first capacitor, the 0. This capacitor is there to filter out any noise coming from the voltage source the battery. Depending on the voltage regulator in use, we can get a regulated positive or negative voltage, at whichever voltage we want.


In this article, we go over how to connect a voltage regulator to a circuit to get a specific DC output regulated voltage. The output voltage of whatever voltage source you want to regulate down whether it’s a transformer, battery, etc. Remember, the input voltage has to be larger than the voltage that the regulator regulates out. Pin 3 is the Output Pin. For now, you can just follow along. Usually the only external components necessary are just capacitors, though heat sinks may also need to be added when heat dissipation is necessary.

How to Connect a Voltage Regulator in a Datashret In this article, we go over how to connect a voltage regulator to a circuit to get a specific DC output regulated voltage. Therefore, it has a smoothing effect and even things out. At the end of this experiment, when our circuit is hooked up, we’re going to read out the voltage with a multimeter and it should give out close to 5 volts.

Also, design changes when dealing with the intended use of the circuit. In order for the regulator to output 5 volts, the voltage entering has to be at least 2 volts higher, so it has to be at least 7 volts. It hooks up to the ground in our circuit.

How to Connect a Voltage Regulator in a Circuit

Okay, now let’s build the circuit. Keep in mind that the design of a voltage regulator depends on the voltage regulator being used and datashheet intended use of a circuit.

Essentially, it acts as a load balancer. Without ground, the circuit couldn’t be complete because the voltage wouldn’t have electric potential and the circuit wouldn’t have a return path.


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. A voltage regulator is a 3-terminal device.

The LM78XX voltage regulators are a popular kind for regulating and outputting positive voltage, while the LM79XX are a popular series of regulators for negative voltage. The second capacitor, the 0.

It shorts this noise to ground and allows datsheet pure DC signal into the regulator. However, for experimental purposes and ease of getting parts, we will use a 9-volt battery as our input voltage. Okay, so let’s recap on the circuit. Pin 1 is the Input Pin. If you don’t have all the parts, don’t feel bad. This capacitor charges up with voltage when the circuit has excess spikes in current and discharges to supply voltage when the circuit is low on current. In this article, we use a datashet voltage regulator, which outputs 7809c, the LM regulator.

The voltage regulator works best and will be most datashedt when a clean DC signal is fed into it. This capacitor is there again to filter out any noise or high-frequency ac signals that may be on the DC voltage line.

CT Datasheet, PDF – Alldatasheet

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 ratasheet voltage to power a logic chip, which needs a precise voltage fed into it in order to give the correct logic output, datashert is crucial. 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. Sign up for Our Newsletter Name: