As a follow-up on his story on tunnel radio, Nick Langan explores college campus carrier-current radio and hears from readers ...

A time domain reflectometer (TDR) measures reflections along a cable. It is similar in principle to radar. To measure those ...

Three-phase power-factor-correction (PFC) power supplies are commonly used to convert ac power from a three-phase grid to a regulated dc voltage with unity input power factor. The output voltage ...