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A spectrum analyzer is a measurement tool that displays real-time frequency analysis of incoming audio signals. It is usually an integral part of equalizers and audio signal processing devices. The vertical axis shows the amplitude of certain frequencies measured in decibels.

The presented device is very simple to build, and consists of several components:

- Arduino nano microcontroller
- VFM202MDA1-1 type VFD Display wich is slightly modified
- Stereo potentiometer to control the intensity of the input signal
- and two capacitors”

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