Build a 12V 10W Audio Amplifier with TDA2003 IC | DIY Mono Amp

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Learn how to make a 12V audio amplifier circuit using the TDA2003 IC. This compact 10W mono amplifier is perfect for car audio, small speakers, and DIY audio projects.

 

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Introduction

In this tutorial, we will build a 10W 12V mono audio amplifier using the TDA2003 IC. This compact and affordable amplifier is widely used in car radios, portable speakers, and DIY audio systems due to its simplicity and high-quality output.

The TDA2003 delivers clear audio with very low distortion and includes built-in thermal and short-circuit protection, making it ideal for beginners and audio enthusiasts.

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Materials for the Project

1. 1. 1X TDA2003 IC
   2. 2X 1000uF CAPACITORS
   3. 1X 100uF CAPACITOR
   4. 1X 10uF CAPACITOR
   5. 1X 0.1uF CAPACITOR
   6. 1X 50K POTENTIOMETER
   7. 1X 1 OHM RESISTOR
   8. 1X 220 OHM RESISTOR
   9. 1X 2-PIN TERMINAL BLOCKS
   10. 1X HEAT SINK
   11. Speaker (4Ω or 8Ω) 
   12. 1X PERF BOARD
   13. JUMPER WIRES
   14. 12V DC Power Supply 

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Download Circuit Diagram

Circuit Diagram

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⚙️ Circuit Explanation

The TDA2003 is a Class AB mono amplifier IC designed to work with a 12V supply and drive a 4Ω or 8Ω speaker.

Key Points:

• The input capacitor filters DC from the audio source.

• The feedback resistors and capacitors determine gain and stability.

• A 470 µF capacitor on the output blocks DC to protect the speaker.

• The 2.2Ω and 1Ω resistors (2W) help regulate current and suppress oscillation.

• Add a heatsink to the IC for thermal protection during high-volume use.

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Power Supply

• Input Voltage: 12V DC

• Current Required: ≥1.5A

• Suitable sources:

  • 12V Battery

  • 12V DC Adapter

  • Car Battery (for car audio)

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Audio Output

• Output Power: Up to 10W RMS into 4Ω

• Impedance Support: 4Ω or 8Ω speakers

• Audio Quality: Clean sound with THD < 0.1%

• Frequency Response: Hz – 18 kHz

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Applications

• Car speaker amplifier

• DIY Bluetooth speaker

• Small home audio system

• Portable music box

• Audio amp for FM radios or MP3 players

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Video Tutorial

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️ Pro Tips

• Use a volume potentiometer at the input for manual control.

• Use a shielded audio input wire to reduce noise.

• Add a reverse polarity diode at the power input for protection.

• Always mount the TDA2003 to a heatsink with thermal paste.

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