In this project, I will show you a 9V 1A Power Supply Circuit using a 7809 Voltage Regulator. It only requires an input 230V AC supply, and the circuit gives its output positive 9V 1A DC Max. Let's make it!
Table Of Contents:
Components List
The following components are required to make this power supply circuit.
| S.no | Components | Value | Qty |
|---|---|---|---|
| 1 | Voltage Regulator (U1) | IC 7809 | 1 |
| 2 | Step-down Transformer (TR1) | 230V /12V, 1A | 1 |
| 3 | Diode Bridge (BR1) | 1N7004 | 4 |
| 4 | Polar Capacitor (C1) | 2200uF, 25V | 1 |
| 5 | Non-polar Capacitors (C2, C3) | 330nF, 100nV | 1, 1 |
| 6 | Aluminium Heat Sink | - | 1 |
| 7 | Breadboard /Veroboard | - | 1 |
| 8 | Connecting Wires | - | - |
7809 Voltage Regulator Features
The IC 7809 Voltage Regulator has some good features they are,
- IC 7809 +9V 1A regulator
- The operating voltage is dc 5v to 18v
- Output current maintains 1 Ampere
- Internal Short Circuit Current Limiting
- Internal Thermal Overload Protection
- Internal Safe–Area Compensation
- Output Voltage Tolerance is 2% to 4%
- Temperature Range of –40°C to +125°C
7809 Voltage Regulator Power Supply Circuit Diagram
The schematic of 9v 1amp power supply circuit using a 7809 voltage regulator is shown below.
Working of 7809 Voltage Regulator Power Supply Circuit
The main component of this regulated power supply circuit is a positive voltage regulator IC 7809, a monolithic integrated circuit designed for 8V fixed–voltage. The working principle of this 8V power supply circuit is easy.
When the circuit gets input ac 230V to the primary of a transformer (T1), step down the voltage to ac 12v 1amp on its secondary. Next, the step-down ac voltage rectifies and converts ac-dc voltage using a full bridge rectifier (BR1) circuit. A capacitor C1 smoothing and filtering the dc voltage. This 12V dc voltage is regulated by the voltage regulator IC (U1) to a constant 9V dc, extra voltage covert in heat (a suitable aluminium heat sink recommended). The capacitors (C2, C3) are used in the circuit the reducing the ripple noise. Thus this power supply circuit gives 9v 1amp dc output.
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