SparkFun
Graphic Equalizer Display Filter - MSGEQ7
The MSGEQ7 is a CMOS graphic equaliser IC that divides the audio spectrum into seven frequency bands: 63 Hz, 160 Hz, 400 Hz, 1 kHz, 2.5 kHz, 6.25 kHz, and 16...
The MSGEQ7 is a CMOS graphic equaliser IC that divides the audio spectrum into seven frequency bands: 63 Hz, 160 Hz, 400 Hz, 1 kHz, 2.5 kHz, 6.25 kHz, and 16 kHz. Each band is peak-detected and multiplexed to provide a DC output representing the amplitude — ideal for driving LED audio visualisers and spectrum analysers.
Requires only two external components (one resistor and one capacitor) to set the on-chip clock oscillator. The multiplexer is controlled via reset and strobe pins, allowing readout with just two I/O pins from your microcontroller.
Key Features
- 7-Band Frequency Analysis – 63 Hz, 160 Hz, 400 Hz, 1 kHz, 2.5 kHz, 6.25 kHz, 16 kHz
- Minimal External Components – Only one resistor and one capacitor needed
- 3.3V or 5V Operation – Supply range of 2.7–5.5V (best performance at 5V)
- 20 dB Gain – Built-in signal amplification
- Low Power – Less than 1 mA typical quiescent current
- 2-Pin Multiplexer Control – Reset and strobe pins for simple readout
- Variable Decay Time – Controlled by multiplexer readout rate (10% decay per read)
- 8-Pin DIP Package – Breadboard-friendly form factor
Specifications
- IC – MSGEQ7
- Technology – CMOS switched-capacitor filters
- Supply Voltage – 2.7–5.5V
- Quiescent Current – <1 mA typical
- Package – 8-pin DIP
Ideal For
- LED audio spectrum visualisers
- Music-reactive lighting projects
- Portable audio equipment
- Arduino and microcontroller audio analysis
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- LED
- A light-emitting diode is a small electronic component that lights up when current flows through it in the correct direction. In this kit, LEDs create the flashing effect, so polarity and correct soldering matter for the project to work.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
- multiplexer
- A multiplexer is a chip or board that lets one controller switch between several devices that would otherwise conflict on the same bus. It matters here because multiple modules with the same I2C address cannot normally share one I2C bus without extra hardware.
Find this product in
Audio & Video
Brands
MSGEQ7 Datasheet
Datasheet · 145.5 KB · Click any page to view full size
Supplier page — sparkfun.com
Supplier Description · 488.0 KB · Click any page to view full size
Related Tutorials
Free guides on learn.littlebird.com.au
