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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.

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. 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.

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. Usually the only external components necessary are just capacitors, though heat dataasheet may also need to be added when heat dissipation is necessary.

For now, you can just follow along. 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.

After it comes out of the regulator, the other capacitor, the 0. The regulator regulates this voltage down to 5 volts.

Now this DC voltage, clean and crisp, is ready to power whatever you want it to, in this case, the load is a resistor and a LED. This is the pin that gives out the regulated voltage, which, in this case, is 5 volts. The first capacitor, the ceramic 0.


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. This produces a voltage of 9 volts. Okay, now let’s build the circuit.

The capacitor, in essence, acts as a bypass capacitor. The second capacitor, the 0. Remember, the input voltage has to be larger than the voltage that the regulator regulates out. Keep in mind that the design of a voltage regulator depends on the voltage regulator being used and the intended use of a circuit. Okay, so let’s recap on the circuit. 7890ct 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 datasheeet to your wanted voltage 5 volts.

How to Connect a Voltage Regulator in a Circuit In this article, we go over how to connect a voltage regulator to a circuit datqsheet get a specific DC output regulated voltage.

This capacitor is there to filter out any noise coming from the voltage source the battery. 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. Therefore, it has a smoothing effect and even things out.

It hooks up to the ground in our circuit.

MCCT Datasheet pdf – 3-Terminal 1A Positive Voltage Regulator – Fairchild Semiconductor

The circuit begins at the 9-volt battery. 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. The voltage regulator works best and will be most efficient when a clean DC signal is fed into it.

If you don’t have all the parts, don’t feel bad. That’s why it’s a good idea to get into hooking up a voltage regulator properly from the sart. 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.


In this article, we use a positive voltage regulator, which outputs 5V, the LM regulator. This capacitor is there again to filter out any noise or high-frequency ac signals that may be on the DC voltage line.

How to Connect a Voltage Regulator in a Circuit

It shorts this noise to ground and allows the pure DC signal into the regulator. It shorts datazheet 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.

However, for experimental purposes and ease of getting parts, we will use a 9-volt battery as our input voltage. Sign up for Our Newsletter Name: 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.

Pin 3 is the Output Pin. Let’s view the complete circuit now and explanations will ensue. This electrolytic capacitor acts as a smoothing capacitor, when load resistance changes cause abrupt voltage spikes and drops, in a circuit. You can buy them at anytime and come back to this page and do the experiment anytime.

In this case, we are using a LM, 780c9t outputs 5 volts. The output voltage of whatever voltage source you want to regulate down whether it’s a transformer, battery, etc. 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 dstasheet to the ceramic capacitor.