Stereo digital audio spectrum analyzer V4.0

This is a stereo upgrade of previous version 3.x.

This version has multiple changes from the previous version, like:

V 4.0A is a version with 18 Bands + Two VU meters for right and left channels.

1. Can handle stereo signals.
2. Display format is 18+1+1( to display 18 bands of frequencies and Left Right signal level) .
3. USB adapter for easy upgrade.
4. Dedicated RTC with battery back-up.
5. Added two usart connectors to create cascade spectrum analyzers( to create large display from boards like this ).
6. A microcontroller twice faster that previous and multiple hardware advantages that increase speed of signal processing and display rendering.

Down I posted two photos with new board design.

 

 

V 4.0B is a version with 20Bands.

A 3D presentation of Audio Spectrum Analyzer 4.0B: