After reverse-engineering the PCB, [bigclivedotcom] concluded that the JWB1981 must include an onboard bridge rectifier. The only other components on the board are three resistors, a capacitor ...

Homework, for those following along, was to build a bridge rectifier and probe the signals from it. Let’s take a look. To the left is a schematic of a full-wave rectifier. Again, the important ...