🔊 DIY: Simple Audio Amplifier Circuit

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🔊 DIY: Simple Audio Amplifier Circuit



Want to boost the sound from your phone, radio, or MP3 player? Build this easy audio amplifier circuit using basic components. It's compact, affordable, and works with small speakers.

🧾 Components Required

ComponentQuantityNotes
LM386 IC1Low voltage audio amplifier chip
Capacitor 10µF1Gain control
Capacitor 100µF2Input/output coupling
Resistor 10Ω1Output filter
Capacitor 0.05µF1Output filter
Speaker (8Ω)1Small 0.5W or 1W speaker
Power Supply (6V–12V)1Battery or DC adapter
Audio jack1For input device
Breadboard/PCB1For circuit build
Wires–For connections

🔌 Circuit Diagram

Basic LM386 Audio Amplifier

r
          +V (9V)
            |
           [10µF]
            |
In →───||───| LM386 |───||───> Speaker
      100µF         |       100µF
                   [10Ω + 0.05µF]
                    (in series)

⚙️ How It Works

  • LM386 IC amplifies low audio signals up to 200 times.

  • 10µF capacitor between pin 1 and 8 sets the gain.

  • 100µF capacitor at input/output filters DC and improves sound quality.

  • Power input of 6–12V is enough.

🛠️ Steps

  1. Mount the LM386 on breadboard or PCB.

  2. Connect all components as shown in the diagram.

  3. Plug in your audio input (from phone, MP3, etc).

  4. Connect power supply.

  5. Enjoy louder sound from the speaker!

✅ Features

  • Simple to build

  • Low voltage operation

  • Portable and compact

  • Great for DIY radios or audio toys

🧠 Extra Tips

  • Use a heatsink if running at full volume.

  • Add a volume control potentiometer at input.

  • Use shielded wires for cleaner sound.

🔋 Power Source Options

  • 9V Battery

  • 6V Rechargeable Battery

  • 12V DC Adapter

🎯 Conclusion

This simple audio amplifier is perfect for beginners who want to learn audio electronics. It works great for hobby projects, mini speakers, and educational demos.

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