This is a PIC-controlled PC interface for analyzing analog waveforms and displaying their harmonic content.

A spectrum analyzer is a sophisticated workshop tool that allows you to analyze a waveform of any shape and establish which frequencies it contains and at which relative amplitudes. The design presented here analyses input signals up to about 50kHz and displays frequency content to around 400kHz. A signal interface board is controlled by a PIC microcontroller and outputs digitized data to a PC-compatible computer, which analyses the data and displays it graphically on its screen. Such displays can assist in improving many types of electronic hardware design.