Spectrum Analyzer V2.5

This was by far my most complex project, spending about one year prototyping, building and improving it.

It started when I found a nice vacuum fluorescent display and I decided to make my own Spectrum Analyzer.

Unlike most of my other projects, most of the schematic, PCB and code was designed by me. Because of this I learned much more about electronics and microcontrollers.

Details and features:

• Sampling rate of 48kHz.
• FFT size: 2048 samples.
• FFT is calculated in real-time using an efficient Radix4 algorithm running on an Arduino Due 84MHz ARM CPU.
• Beautiful oldschool VFD display.
• ISO standard frequency bands.
• Everything powered from a 5V USB port.
• Configurable using a small remote control.
• Automatic gain switching of the hardware ADC.
• Per band individual gain control based on running average.
• Command line interface for debugging.
• All configurations saved to non-volatile memory on restart.
• Automatic power of when no audio is detected.
• Everything in a small 10.2cm x 5.5cm x 3.3 cm package.

To see it in action, watch the video.