This is a circuit which reacts to ambiance music and glows the LEDs with the beats of the music.

Here, I will show you four different ways to make a Music Reactive LEDs Circuit using :-

1. Single Transistor

2. Two Transistors

3. AUX Cable

4. Speaker

Step 1: Materials Required

These are the Components Required for making the circuit:

1. Using Single Transistor

• Condenser Microphone

• Transistors: BC 547

• Resistors: 47 K Ω, 330 Ω

• LED

2. Using Two Transistors

• Condenser Microphone

• Transistors: BC 547 (2)

• Resistors: 1M, 10K (2)

• Capacitor: 0.1 μF (100nF)

• LEDs (2)

3. Using AUX Cable

• Old Earphones (For AUX Cable)

• Transistors: BC 547 (2)

• Resistors: 1M, 10K (2)

• Capacitor: 0.1 μF (100nF)

• LEDs (2)

4. Using Speaker

• IC LM386

• Transistors: BC 547, BC 557

• Resistors: 330 Ω

• Capacitor: 100μF

• Speaker

• LED

Other Requirements :

• Battery: 9V and battery clip

• Breadboard

• Breadboard Connectors

Step 2: Circuit Diagrams

These are the Circuit Diagrams for circuit using :

1. Single Transistor

2. Two Transistors

3. AUX Cable

4. Speaker