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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.

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. More will be on this for more advanced projects, datasheeg this page is a good start for those starting off in datasheet voltage regulators for basic circuits.

How to Datashee 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. 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.

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. The first capacitor, the ceramic 0. 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.

Essentially, it acts as a load balancer. The second capacitor, the 0.


Satasheet ground, the circuit couldn’t be complete because the voltage wouldn’t have electric potential and the circuit wouldn’t have a return path. You can buy them at anytime and come back to this page and do the experiment anytime. The capacitor, in essence, acts as a bypass capacitor. 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, 78009ct 5 volts. The first capacitor, the 0. That’s why it’s a good idea to get into hooking up a voltage regulator properly from the sart. Depending on the voltage regulator in use, we can get a regulated positive or negative voltage, at whichever voltage we want.

Always consult the Manufacturer’s Datasheet for the voltage regulator in 780c9t for a circuit to see how to hook it up with the necessary required external components. In this article, we use a positive voltage regulator, which outputs 5V, the LM regulator. Datashete this article, we go over how to connect a voltage regulator to a circuit to get a specific DC output regulated voltage.

A voltage regulator is a 3-terminal device. 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 datasheet to act as a smoothing capacitor. Usually the only external components necessary are just capacitors, though heat sinks may also need to be added when heat dissipation is necessary.

MIK CT (Микрон) – Стабилизатор положительного напряжения (5, 8, 12, 15 В) (корпус TO)

It shorts this noise to ground and allows the pure DC signal into the 7809tc. This produces a voltage of 9 volts. Pin 2 is Ground. Pin 1 is the Input Pin.

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. Keep in mind that the design of a voltage regulator depends on the voltage regulator being used and the intended use of a datasheey.

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. This capacitor is there again to filter out any noise or high-frequency ac signals that may be on the DC voltage line. Okay, so let’s recap on the circuit. The output voltage of whatever datxsheet source you want to regulate down whether it’s a transformer, battery, etc.


Sign up for Our Newsletter Name: If you don’t have all the parts, don’t feel bad. This capacitor is there to filter out 7809cf noise coming from the voltage source the battery. The circuit begins at the 9-volt battery. 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.

After it comes out of the regulator, the other capacitor, the 0.

We don’t want any ac noise ripple imposed on the DC line voltage. In this case, we are using a LM, which outputs 5 volts. It hooks up to the ground in our circuit. Remember, the input voltage has to be larger than the voltage that the regulator regulates out.

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. This electrolytic capacitor acts as a smoothing capacitor, when load resistance changes cause abrupt voltage spikes and drops, in a circuit. Okay, now let’s build the circuit.

How to Connect a Voltage Regulator in a Circuit

Pin 3 is the Output Pin. The Datasheet specifies which datasheeg of capacitors to use, so it’s a good idea to learn from the people who manufacturered the chip.

For now, you can just follow along. 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.