Frequency Response Sweep Oscillator
This project found its origins in a need to see and measure the frequency response of audio filters, tone controls and amplifiers in real time. An SX28 microcontroller module from Parallax turned out to be a really good means of implementing the circuit. The author developed this circuit as a means of displaying the frequency response of a circuit on a standard oscilloscope. The firmware for the microcontroller core of the test instrument is written in assembly language.