Audio Amplifier Circuit can amplify audio signals coming from mobile, laptop or any other electronic devise on connecting through AUX cable.

Here, I will show you three different ways to make this Audio Amplifier Circuit using :

1. Single Transistor

2. Two Transistors

3. LM 386 IC

Step 1: Components Required

These are the Components Required for making the circuit :

1. Using Single Transistor

• Transistors: BC 547

• Resistor: 10 K Ω

• Capacitor: 100 μF

• AUX cable

• Speaker

2. Using Two Transistors

• Transistors: BC 547 (2)

• Resistors: 10K Ω

• Capacitors: 470 μF, 100nF (0.1μF)

• AUX cable

• Speaker

3. Using LM 386 IC

• LM 386 IC

• Resistor: 10K Ω

• Capacitors: 220 μF, 100 nF (0.1 μF)

• AUX cable

• Speaker

Other Requirements :

• Battery: 4.5V

• Breadboard

• Breadboard Connectors

Step 2: Circuit Diagrams

These are the Circuit Diagrams for making the circuit using :

This video shows step-by-step, how to build all these circuits.