Build the jcan to measure resistor noise

摘要

You may have literally heard the difference between resistor compositions while testing an audio pre-amplifier with different types of components. Or, if you work with high gain amplifiers used to measure signals, you might also be interested in resistor noise. It is usually of concern in small signal transistor or tube applications, as well as in op-amp circuits generally using two or more resistors. I recently started wondering how to measure the noise from a resistor. I wanted to measure it — in some common unit — just like an ohmmeter measures resistance.