Abstract
An experimental setup is described to measure 1/f noise (pink noise) in conductors using a PC equipped with a sound card functioning as a spectrum analyzer. A simple auxiliary analog electronic circuit with three operational amplifiers has been assembled to yield the required amplification, to match the sound card signal levels, and to implement a bridge configuration to improve dynamical range. Test experiments and data analysis have been conducted using commonly available software, together with some custom scripts and C code. The whole setup is technically accessible and economical for both the high school and undergraduate levels. Results are reported for pink noise of vintage carbon resistors spanning seven frequency decades, from 1 mHz to 10 kHz.
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