Low-power circuits commonly use transformerless power supplies. However, the use of earth grounds in many of these circuits creates a serious problem that is often ignored. The very popular ...

A preferred method would be to use the power-supply controller to precisely control the start-up-voltage sequencing of the power-supply rails. Figure 1 shows a simple op-amp circuit that integrates a ...

On one end of the twisted pair is a power supply and decoder circuit, which sends 9 volts up the line to power the PIC sensor.