Simon Inns has built some pretty interesting projects and his latest project is sure to impress. Simon’s latest project was building a Real-time Audio Spectrum Analyzer. His project uses a PIC18F4550 8-bit microcontroller as well as a highly optimized 16-bit Fast Fourier Transformation (FFT) routine coded entirely in C. The output from the FFT is displayed using a 128x64 graphical LCD to allow a real-time view of an audio signal. He utilizes the properties of an LM386 to move the input signals from a range of -0.5V to +0.5V into a very ADC friendly range of 0-5V. Simon has provided detailed notes on his construction process and even provides PCB and Schematic, as well as PIC18F4550 firmware downloads at his website that can be found here: http://www.waitingforfriday.com/index.php/Real-Time_Audio_Spectrum_Analyser
Eavesdropper
