After discussing the three transistor high-side buck p-mosfet driver (a recognised circuit and not mine) with some of EW’s sage commenters, I wondered once again if I could design something similar ...

You can combine a carefully chosen op amp, a low-threshold P-channel MOSFET, and two feedback resistors to make a rectifier circuit with less forward drop than a diode (Figure 1). The rectified output ...

When powering a battery operated circuit, the experimenter must make a decision: either take his chances (Murphy loves this one), or opt to add protection in the form of a simple series diode.

The voltage across the capacitor pretending to be the mosfet gate capacitance is not getting close enough to the oV rail (see black rectangle below left) to turn off the mosfet properly – my ...