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This is the pin that gives out the regulated voltage, which, in this case, is 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.

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.

The first capacitor, the 0.

Sign up for Our Newsletter Name: Okay, now let’s build the circuit. The first capacitor, the ceramic 0.

The voltage regulator works best and will be most efficient when a clean DC signal is fed into it. That’s why it’s a good idea to get into hooking up a voltage regulator properly from the sart. 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.

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 7809cf to be at least 7 volts.


It hooks up to the ground in our circuit.

The circuit begins at the 9-volt battery. Essentially, it acts as a load balancer. The regulator regulates this voltage down to 5 volts.

CT Datasheet, PDF – Alldatasheet

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. 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. 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.

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

In this article, we go over how to connect a voltage regulator to a circuit to get a specific DC output regulated voltage. This capacitor is there to filter out any noise coming from the voltage source the battery.

How to Connect a Voltage Regulator in a Circuit

This capacitor is there again to filter out any noise or high-frequency ac signals that may be on the DC voltage line. Usually the only external components necessary are just capacitors, though heat sinks may also need to be added when heat dissipation is necessary. The Datasheet specifies which value of capacitors to use, so it’s a good idea to learn from the people who manufacturered the chip.


Pin 2 is Ground.

Okay, so let’s recap on the circuit. However, for experimental purposes and ease of getting parts, we will use a 9-volt battery as our input voltage. The second capacitor, the 0. 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. Pin 1 is the Input Pin. You can buy them at anytime and come back to this page and do the experiment anytime.

This produces a voltage of 9 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.

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But if you’re going 7809ft 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 satasheet 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 circuit.