While troubleshooting the power supply of a 1970s Centurion system, [Usagi Electrics] came across a fascinating feature of these units: the ferroresonant, or constant voltage transformer (CVT).

The performance of plug-in power conditioners with an isolation transformer in the same electrical system is predictable and repeatable. Surge strips create N-G voltage. Plug-in power conditioners ...

and a standby voltage.A remote on/off is also provided. Figure 1: CUS350M power supply block diagram The main and the auxiliary outputs use a common transformer and switching circuit. If the remote on ...

Editor's Note: Here's another take on the transformerless AC line power supply, which finds use in some well-insulated ... AC from a mains source to any desired level for powering low-voltage circuits ...

To investigate the electrical realm of high-frequency and high-voltage ... the circuit calls for a power supply, a large capacitor, the coil (transformer) itself, and adjustable spark-gap electrodes.