Music Rhythm Operated Dancing Light using LEDs & Transistors

Music Rhythm Operated Dancing Light (Last Updated On: June 14, 2018)


In this we are going to show you how to make Music Rhythm Operated Dancing Light using LEDs & Transistors. You might have seen the Disco Lights or DJ lights or light during a function that turn ON and OFF according to the beats or Rhythm of the music. This Music Rhythm Operated Dancing Light circuit is based on transistor BC547. This circuit is very simple and easy to build, it just requires few basic components.

These lights turns ON & OFF according to the length and pitch of music beats or rhytm. Basically these are designed to pick the high intensity sound like Bass sound. So these lights follow the high pitch beats in music like drum beats, and Turn ON and OFF according to music pattern.

Components Required:

The circuit requires few of the basic components which are listed below:

1. Transistors BC547 - 7 
2. LED1 - 6
3. Capacitor - 100nF or O.1uF
4. Resistor 1M -1
5. Resistor 10K - 2
6. Resistor 22 Ω - 6
7. Mic. - 1
8. Switch ON/OFF - 1
9. 9 Volt DC Power Supply

Circuit Diagram:

Assemble the circuit on breadboard as per the circuit diagram.

Music Rhythm Operated Dancing Light

Working of Music Rhythm Operated Dancing Light:

In this Simple Music Rhythm Operated Dancing Light, mic. picks up the sound signals & converts them into voltage signal. The voltage developed is directly proportional to quantity of sound falling on the mic. These voltage signals are further fed into High Pass RC Filter R1 & C1 for eliminating the noise from the sound. Further a NPN transistor Q1 BC547 works as a signal amplifier.

Then finally these music signals are given to the array of six transistors grounded across with 22 Ω resistor. Transistor in this array works as amplifier, and glows the four LEDs according to the sound pattern. We can also add more LEDs & transistor to make it following more longer pattern.

The sensitivity of mic. can be increased or decreased by changing the value of R2 & C1. The formulae for calculating the resonant frequency can be given as:

F = 1/ (2πRC)

Video Demonstration:

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