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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. Keep in ddatasheet that the design of a voltage regulator depends on the voltage regulator being used and the intended use of a 78009ct.

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. The circuit begins at the 9-volt battery. Okay, so let’s recap on the circuit.

Pin 3 is the Output Pin. The regulator regulates this voltage down to 5 volts. The voltage regulator works best and will be most efficient when a clean DC signal is fed into it. We don’t want any ac noise ripple imposed on the DC line voltage.

How to Connect a Voltage Regulator in a Circuit

The output voltage of whatever voltage source you want to regulate down whether it’s a transformer, battery, etc. Okay, now let’s build the circuit. The first capacitor, the ceramic 0.

Let’s view the complete circuit now and explanations will ensue. You can buy them at anytime and come back to this page and do the experiment anytime. 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.


Remember, the input voltage has to be larger than the voltage that the regulator regulates out. This electrolytic capacitor acts as a smoothing capacitor, when load resistance changes cause abrupt voltage spikes and drops, in a circuit.

However, for experimental purposes and ease of getting parts, we will use a 9-volt battery as our input voltage. Also, design changes when dealing with the intended use of the circuit. This produces a voltage of 9 volts.

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

That’s why it’s a good idea to get into hooking up a voltage regulator properly from the sart. For now, you datsaheet just follow along. The voltage regulator should always be fed as smooth of a DC signal as possible dataseet gives the best regulated output so it can regulate it down to its specified voltage. 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.

In this article, we fatasheet a positive voltage regulator, which outputs 5V, the LM regulator. It shorts this noise to ground and allows the pure DC signal into the regulator. The Datasheet specifies which value of capacitors to use, so it’s a good idea to learn from the people who manufacturered the chip. 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.

In this case, we are using a LM, which outputs 5 volts. Essentially, it acts as a load balancer. 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.

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.

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

The second capacitor, the 0. Usually the only external components necessary are just capacitors, though heat sinks may also need to be added when heat dissipation is necessary. Depending on the voltage regulator in use, we can get a regulated positive or negative voltage, at whichever voltage we want. Sign up for Our Newsletter Name: Pin 2 is Ground. If you don’t have all the parts, don’t feel bad.

When the load of a circuit is stable and unchanging, as in the example above, it is usually not necessary to datasyeet a large electrolytic datashset on the output to act as a smoothing capacitor. Therefore, it has a smoothing effect and even things out. This capacitor is there again to filter out any noise or high-frequency ac signals that may be on the DC voltage line. A voltage regulator is a 3-terminal device.

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.

The first dataseet, the 0. 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. 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. 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.

In this article, we go over how to connect a voltage regulator to a circuit to get a specific DC output regulated voltage.