# Convert 35V DC to 9V DC Using 7809 Voltage Regulator

39

Hii Friend,

Today I am going to make a circuit of voltage controller.By using this circuit we can convert upto 35V DC to Constant 9V DC.In this circuit we will use only 7809 Voltage regulator.

Let's get started,

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## Step 1: Take All Components As Shown Below

Components required -

(1.) Voltage regulator - 7809 x1

(2.) Capacitor - 63V 470uf x1 {Here I am using 25V 470uf capacitor because I will give 17V DC Input.}

(3.) Capacitor - 16/V25V/63V 100uf x1

(4.) Input Power Supply voltage in DC - Input voltage<35V {Input Voltage Should be less than 35V DC}

(5.) Connecting wires

(6.) Clippers

## Step 2: 7809 Voltage Regulator Pins

This picture shows the pins of this voltage regulator.

Pin-1 is Input,

Pin-2 is GND (Ground) and

Pin-3 is Output.

## Step 3: Connect 470uf Capacitor

Solder +ve pin of 470uf electrolytic capacitor to Input pin/Pin-1 of voltage regulator and

Solder -ve pin of capacitor to GND Pin of the Voltage regulator as you can see in the picture.

NOTE : Voltage of capacitor should be greater than Input voltage.So connect 63V 470uf capacitor to parallel of input power supply as i connected in the picture.But Here I can use 25V 470uf capacitor because I have to give 17V Input which is less than Capacitor's voltage.

## Step 4: Connect 100uf Capacitor

Next solder +ve pin of 100uf electrolytic capacitor to Output pin of the voltage regulator and

Solder -ve pin of capacitor to GND Pin of the voltage regulator as you can see in the picture.

## Step 5: Connect Clipper Wire for 9V Output Power Supply

Now we have to connect clip wires to get constant 9V DC Output from this circuit.

Solder +ve output wire to Output pin of voltage regulator and

Solder -ve output wire to GND Pin of the Voltage regulator as solder in the picture.

## Step 6: Connect Input Power Supply Clip

Now our circuit is ready so connect Input power supply wire to this circuit.

Connect +ve clip of Input voltage to +ve pin of 470uf capacitor and

-ve clip to GND Pin of the voltage regulator.

NOTE : We can give Input Power supply voltage upto 35V DC to this circuit.

Now as you can see in the above pictures.

Picture-1)- I Give 17.6V DC Input and we get 9V Constant Output from this circuit as you can see in the picture-2.

NOTE 1: If we will increase the input voltage then Output voltage will be same i.e. 9V DC.

Like this we can make a circuit for getting constant 9V Power supply using 7809 Voltage regulator.

NOTE 2 : Add heatsink if 7809 Voltage regulator get heated.

Thank you

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## Discussions

it's better to use step down converter
7809 voltage regulator will produce too much heat (you can burn your fingers) if you want to power some electronics with it