How to Use 7809 Voltage Regulator?
by lorry in Circuits > Electronics
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How to Use 7809 Voltage Regulator?
![Convert 35V DC to 9V DC Using 7809 Voltage Regulator.png](/proxy/?url=https://content.instructables.com/FJH/D6PM/LOVHL1HD/FJHD6PMLOVHL1HD.png&filename=Convert 35V DC to 9V DC Using 7809 Voltage Regulator.png)
Hello Friend,
Today, I will guide you through creating a voltage control circuit. With this circuit, we can transform up to 35V DC into a stable 9V DC using only a 7809 Voltage Regulator.
Let's begin,
Supplies
![supplies.png](/proxy/?url=https://content.instructables.com/F3I/878U/LOVHL1KF/F3I878ULOVHL1KF.png&filename=supplies.png)
Components needed:
- Voltage regulator - 7809 x1
- Capacitor - 63V 470uF x1 {I'm using a 25V 470uF capacitor as I'm providing a 17V DC Input.}
- Capacitor - 16V/25V/63V 100uF x1
- Input Power Supply voltage in DC - Input voltage < 35V {Input Voltage should be less than 35V DC}
- Connecting wires
- Clippers
7809 Voltage Regulator Pins
![L7809-Pinout.png](/proxy/?url=https://content.instructables.com/FJ4/PNPW/LOVHL1KY/FJ4PNPWLOVHL1KY.png&filename=L7809-Pinout.png)
This image illustrates the pins of the voltage regulator.
- Pin-1 is Input,
- Pin-2 is GND (Ground), and
- Pin-3 is Output.
Connect 470uF Capacitor
![470uf capacitor.png](/proxy/?url=https://content.instructables.com/F62/8ROT/LOVHL1LG/F628ROTLOVHL1LG.png&filename=470uf capacitor.png)
Solder the +ve pin of the 470uF electrolytic capacitor to the Input pin/Pin-1 of the voltage regulator and
Solder the -ve pin of the capacitor to the GND Pin of the Voltage regulator, as shown in the picture.
NOTE: The capacitor voltage should be greater than the Input voltage. So, connect a 63V 470uF capacitor in parallel with the input power supply, as I connected in the picture. However, I'm using a 25V 470uF capacitor here because I'm providing a 17V input, which is less than the capacitor's voltage.
Connect 100uF Capacitor
![Connect 100uf Capacitor.png](/proxy/?url=https://content.instructables.com/FVM/KCX6/LOVHL1M0/FVMKCX6LOVHL1M0.png&filename=Connect 100uf Capacitor.png)
Next, solder the +ve pin of the 100uF electrolytic capacitor to the Output pin of the voltage regulator and
Solder the -ve pin of the capacitor to the GND Pin of the voltage regulator, as shown in the picture.
Connect Clipper Wire for 9V Output Power Supply
![9V Output Power Supply.png](/proxy/?url=https://content.instructables.com/FUR/I2L0/LOVHL1MK/FURI2L0LOVHL1MK.png&filename=9V Output Power Supply.png)
Now, connect clip wires to obtain a constant 9V DC output from this circuit.
Solder the +ve output wire to the Output pin of the voltage regulator and
Solder the -ve output wire to the GND Pin of the Voltage regulator, as shown in the picture.
Connect Input Power Supply Clip
![Input Power Supply Clip.png](/proxy/?url=https://content.instructables.com/FMT/RS3S/LOVHL1N5/FMTRS3SLOVHL1N5.png&filename=Input Power Supply Clip.png)
Now that our circuit is ready, connect the input power supply wire to this circuit.
Connect the +ve clip of the Input voltage to the +ve pin of the 470uF capacitor and
Connect the -ve clip to the GND Pin of the voltage regulator.
NOTE: We can provide an Input Power supply voltage up to 35V DC to this circuit.
Reading
![Reading.png](/proxy/?url=https://content.instructables.com/FK9/25BB/LOVHL1NQ/FK925BBLOVHL1NQ.png&filename=Reading.png)
Now, as depicted in the above pictures:
- Picture-1) - I provided a 17.6V DC Input, and we obtained a constant 9V Output from this circuit, as seen in picture-2.
NOTE 1: If we increase the input voltage, the output voltage will remain the same, i.e., 9V DC.
This is how we can create a circuit to obtain a constant 9V Power supply using a 7809 Voltage regulator.
NOTE 2: Add a heatsink if the 7809 Voltage regulator gets heated.