A transformerless power supply (TPS ... voltages out of the same circuit just by picking the right Zeners. Without an isolation transformer, you can do a lot with a battery-powered (non-grounded ...

Their benefits are such that it’s become surprisingly rare to see a traditional linear power supply with a mains-frequency transformer and rectifier circuit, so [ElectroBoy]’s dual voltage PSU ...

This article explains how to extend the battery lifetime of a device by adding a nanopower converter to an existing system, ...

These could be batteries, solar panels, or a power supply connected to the mains ... with the hazardous chemicals inside the battery. The circuit symbol for a battery is made by joining two ...