• Skip to main content
  • Skip to primary sidebar

Homemade Circuit Projects

Get free circuit help 24/7

New Projects | Privacy Policy | About Us | Contact | Disclaimer | Copyright | Videos 

Op Amp Basics | 555 Circuits | Hobby Circuits | LED Driver | For Beginners | Basic Circuits | Transistor Circuits | Voltage Regulators 

You are here: Home / LED and Light Effect / Wireless Music Level Indicator Circuit

Wireless Music Level Indicator Circuit

Last Updated on August 9, 2019 by Swagatam 31 Comments

A wireless music level indicator is an electronic device built for sensing the varying levels of a music signal and convert it into corresponding levels of illumination over an LED array bar.

This simple circuit will create dazzling LED light effect by detecting any music frequency in the atmosphere and by illuminating a 10 LED bar graph meter, indicating the level of music.

music light effect
caution electricity can be dangerous

The proposed circuit is suitable for applications where music and entertainment are involved, such as in parties, festivals, get to togethers etc.

Since the circuit is designed to operate without wires, no physical contact becomes necessary making the unit easy to handle and very portable.

The circuit can be powered with a 3V battery or even with your cellphone charger and could be plugged in anywhere in the music hall for getting the intended dazzling music operated light effects.

How it Works

Referring to the circuit diagram below, we can understand the design with the help of the following points:

The circuit is basically built around two stages: 1) a microphone amplifier, 2) a LM3915 based digital LED display processor.

The T1, T2, T3 forms a simple transistorized mic amplifier circuit, which amplifies weak atmospheric music or audio levels to relatively stronger voltage amplitudes at the collector of T3.

The LM3915 is configured as a voltage detector and an LED driver. Any voltage rise and fall pattern at its pin#5 is transformed into a correspondingly sequencing 10 LED display bar graph display connected across the 10 outputs of the IC.

Meaning, at the minimum voltage range, LED#1 will illuminate and as the voltage rises, the corresponding LEDs will begin illuminating in an incrementing sequential manner. At the maximum range the 10th LED will illuminate.

The process will reverse as the voltage drops at this pin, creating a continuous to and fro movement on the LED illumination witha wonderful music enriched light effect.

This maximum detection range can be set or adjusted with the shown 10K preset attached on the same pinout of the IC.

In the proposed design, the amplified audio output from the MIC stage is applied to pin#5 of LM3915. The IC sense the varying amplitudes of the music signals and accordingly causes the LEDs to dance in the intended reverse forward pattern.

The values of C2 and R2 together for individually could be tweaked for adjusting the time response of the sequencing. Higher values will allow slower movement of the LEDs, while lower values will allow the LEDs to sequence at a faster rate.

wireless VU music level indicator circuit

Video Demonstration:

Parts List

  • R1 = 4k7
  • R2, R6, R9 = 1K
  • R3 = 2M2
  • R4 = 33K
  • R5 = 470 ohms
  • R7 = 10K
  • R8 = 10k preset
  • C1 = 0.22uF ceramic
  • C2 = 100uF/16V or 25V
  • C3, C4 = 1uF/16V or 25V
  • T1, T2 = BC547
  • T3 = BC557
  • MIC = electret MIC
  • LEDs = all are red LEDs, 5mm, 20mA type, or as desired.

How to Connect with a 3.5mm jack Audio Input

For users who do not wish to have a wireless music level detection functionality can easily modify the design accordingly by eliminating the MIC amplifier stage entirely.

The schematic for a 10 LED music level indcicator for USB connection or for a 3.5mm mobile phone connection is shown below. The circuit input can be also be directly connected with a loudspeaker terminals for achieving the required high quality music level indication.

wireless USB music level indicator circuit

You'll also like:

  • 1.  Light Emitting Diodes (LED) Explained
  • 2.  Simple Kitchen Timer Circuit – Egg Timer
  • 3.  Making LED Lamp using Cellphone Charger
  • 4.  10 Best Timer Circuits using IC 555
  • 5.  Make a Simple Machine Gun Sound Effect Generator Circuit
  • 6.  10 Simple Unijunction Transistor (UJT) Circuits Explained

About Swagatam

Swagatam is an electronic engineer, hobbyist, inventor, schematic/PCB designer, manufacturer. He is also the founder and the author of the website: https://www.homemade-circuits.com/, where he loves sharing his innovative circuit ideas and tutorials.
If you have any circuit related queries, you may interact through comments, and get guaranteed replies from the author.

Reader Interactions

Have Questions? Please post your comments below for quick replies! Comments should be related to the above artcile Cancel reply

Your email address will not be published. Required fields are marked *



Primary Sidebar

Categories

  • 3-Phase Power (15)
  • 324 IC Circuits (19)
  • 4017 IC Circuits (52)
  • 4060 IC Circuits (27)
  • 555 IC Circuits (99)
  • 741 IC Circuits (20)
  • Arduino Engineering Projects (83)
  • Audio and Amplifier Projects (126)
  • Battery Chargers (83)
  • Car and Motorcycle (96)
  • Datasheets (78)
  • Decorative Lighting (Diwali, Christmas) (33)
  • Electronic Components (101)
  • Electronic Devices and Circuit Theory (36)
  • Electronics Tutorial (121)
  • Fish Aquarium (5)
  • Free Energy (34)
  • Fun Projects (14)
  • GSM Projects (9)
  • Health Related (22)
  • Heater Controllers (31)
  • Home Electrical Circuits (107)
  • How to Articles (20)
  • Incubator Related (6)
  • Industrial Electronics (28)
  • Infrared (IR) (40)
  • Inverter Circuits (98)
  • Laser Projects (13)
  • LED and Light Effect (98)
  • LM317/LM338 (22)
  • LM3915 IC (25)
  • Meters and Testers (69)
  • Mini Projects (150)
  • Motor Controller (69)
  • MPPT (7)
  • Oscillator Circuits (25)
  • PIR (Passive Infrared) (9)
  • Power Electronics (35)
  • Power Supply Circuits (86)
  • Radio Circuits (10)
  • Remote Control (50)
  • Security and Alarm (66)
  • Sensors and Detectors (132)
  • SG3525 IC (5)
  • Simple Circuits (75)
  • SMPS (29)
  • Solar Controllers (63)
  • Timer and Delay Relay (55)
  • TL494 IC (5)
  • Transformerless Power Supply (9)
  • Transmitter Circuits (42)
  • Ultrasonic Projects (17)
  • Water Level Controller (45)

Calculators

  • AWG to Millimeter Converter
  • Battery Back up Time Calculator
  • Capacitance Reactance Calculator
  • IC 555 Astable Calculator
  • IC 555 Monostable Calculator
  • Inductance Calculator
  • LC Resonance Calculator
  • LM317, LM338, LM396 Calculator
  • Ohm’s Law Calculator
  • Phase Angle Phase Shift Calculator
  • Power Factor (PF) Calculator
  • Reactance Calculator
  • Small Signal Transistor(BJT) and Diode Quick Datasheet
  • Transistor Astable Calculator
  • Transistor base Resistor Calculator
  • Voltage Divider Calculator
  • Wire Current Calculator
  • Zener Diode Calculator

© 2023 · Swagatam Innovations