Found in Motorola's 1968 power circuit manual, this circuit has a high input voltage and no information was given about the transformers as the original types are commercial at the time.
We found this circuit in a 1986 Elettronica Pratica magazine, but the components used are common. As...
We got this circuit from Radio Electronics from July 1990. The circuit mimics the sound of the red...
This circuit interrupts the power supply when grounding is missing. The circuit is from an old...