Stereo Spectrum Analyzer

Stereo Spectrum Analyzer
Also known as a graphic equalizer display, it's a sixteen band stereo spectrum analyzer with a multi-color LED bar-graph display, overload indicator, automatic brightness, and fifteen display modes plus three just-for-fun modes.
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Graphically displays the real-time audio spectrum for a stereo audio signal.

Each stereo channel is broken down into 16 distinct frequency bands from 20 Hz to 20 KHz (see table below) and then displayed in a 16 level 3-color LED display. Fifteen analyzer display modes are available; nine different display styles including horizontal, vertical, dot, and VU styles, plus fast or slow response variations. The LED display brightness automatically adjusts to the ambient light level.

A single button controls all of the mode settings. The input signal gain is digitally controlled with two buttons (up/down) so virtually any line level input signal can be used. The input signal can be connected directly to a computer "line out" audio source or an entertainment system's line level (amplifier input). Direct connection to speakers is also possible when a line level signal is not available.

Spectrum analyzer frequency display bands (each band is a bar graph column):
 Band  Frequency
1 12 - 37 Hz
2 37 - 61 Hz
3 61 - 85 Hz
4 85 - 110 Hz
5 110 - 134 Hz
6 134 - 183 Hz
7 183 - 256 Hz
8 256 - 378 Hz
9 378 - 598 Hz
10 598 - 964 Hz
11 964 - 1575 Hz
12 1575 - 2795 Hz
13 2795 - 4749 Hz
14 4749 - 7678 Hz
15 7678 - 12073 Hz
16 12073 - 20000+ Hz

Plus there are three additional just-for-fun* display modes:

  • Conway's Game of Life
  • Bouncing Balls
  • Hypnotizer

This is a hackable gadget! The design files are published here (see the Resoruces section below), and you can modify the source code and reprogram the device.

* The just-for-fun display modes do not respond to the audio input signal; they are just entertaining displays by themselves.


  • Model: 1301
  • Display: 2.5"(65mm) square Red/Green/Yellow LED array (per channel)
  • Dimensions: 6.5"(165mm)W x 3.75"(95mm)H x 3.1"(79mm)D
  • Weight: 18.5 oz (524 g)
  • Power Input: 5 VDC, 1 A
  • AC Adapter: 100-240 VAC, 50-60 Hz, CE safety rated
  • Input Signal: 3.5 mm stereo connector, line level signal
  • Case: Acrylic, black mirror finish


User Manual:  download (PDF)
Quick Start:  download (PDF)
Schematic:  download (PDF)
Source Code:  download (ZIP)

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no pictureStereo Spectrum Analyzer Bundle

Product Reviews
2 Reviews, Average rating 5 starsWrite a Review

"great product and as perfect for my use !" by Marcelo Guimaraes - Brazil at 14:48 on 2018.4.25    starstarstarstarstar
I liked the product too, it has the effect I was looking for a project and this has a cost-effective and visually great and very stable in operation, I printed the manual and found it easy to set up and made an adapter for use in car and it was perfect, I recommend to anyone who wants a spectrum analyzer beautiful, well-crafted and good physical structure and functional!

"Simply Wow" by NIcholas at 14:48 on 2018.4.25    starstarstarstarstar
For the money, this little gadget can\'t be beat. For those of you that like extra visuals with your music or just cool gadgets, this is a gem. It\'s responsive, has lots of cool features and is beautifully enclosed in a great case.

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