The basic circuit is the well-known Wien bridge oscillator where the R-C pairs are switched in and out of the feedback loop to achieve frequency range control. This was accomplished with rotary ...

The investigation into why a cargo ship lost power and struck a Baltimore bridge last month ... the electrical power system and look at the circuit breakers,” NTSB Chairwoman Jennifer Homendy ...

"Investigators are also examining the bridge design and how it could be ... have also requested assistance to examine its circuit breakers. "That is where our focus is right now in this ...