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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. In this article, we use a positive voltage regulator, which outputs 5V, the LM regulator.

The first capacitor, the 0. 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. 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.

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

Usually the only external components necessary are just capacitors, though heat sinks may also need to be added when heat dissipation is necessary. However, for experimental purposes and ease of getting parts, we will use a 9-volt battery as our input voltage. Keep in mind dataaheet the design of a voltage regulator depends on the voltage regulator being used and the intended use of a circuit.

Remember, the input voltage has to be larger datashfet the voltage that the regulator regulates out. So for instance, if you have 10 daasheet 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.


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

Essentially, it acts as a load balancer. datashfet

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.

Depending on the voltage regulator in use, we can get a regulated positive or negative voltage, at whichever voltage we want. If you don’t have all the parts, don’t feel bad. You can buy them at anytime ddatasheet come back to this page and do the experiment anytime. Also, design changes when dealing with the intended use of the circuit.

This capacitor is there to filter out any noise coming from the voltage source the battery.


The circuit begins at the 9-volt battery. Let’s view the complete circuit now and explanations will ensue.

Therefore, it has a smoothing effect and even things out. Now this DC voltage, clean and crisp, is ready to power whatever you want it to, in this case, the load is a resistor 78099ct a LED. 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.


Without ground, the circuit couldn’t be dxtasheet because the voltage wouldn’t have electric potential and the circuit wouldn’t have a return path.

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

Sign up for Our Newsletter Name: In this case, we are using a LM, which outputs 5 dataasheet. This is the pin that gives out the regulated voltage, which, in this case, is 5 volts. Pin 1 is the Input Pin.

How to Connect a Voltage Regulator in a Circuit

The voltage regulator works best and will be most efficient when a clean DC signal is fed into it. Always consult the Manufacturer’s Datasheet for the voltage dahasheet in use for a circuit to see how to hook it up with the necessary required external components.

Okay, so let’s recap on the circuit. Pin 2 is Ground.

The output voltage of whatever voltage source you want to regulate down whether it’s a transformer, battery, etc. This produces a voltage of 9 volts.

The voltage regulator should always be fed as smooth of a DC signal as possible which satasheet the best regulated output so it can regulate it down to its specified voltage.

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. 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.