Using a MOSFET as a switch is generally pretty simple. Make the gate voltage sufficient with respect to the source and current flows through the channel. However, if you are switching higher voltages, ...
What is a power MOSFET? We all know how to use a diode to implement a switch. But we can only switch with it, not gradually control the signal flow. Furthermore, a diode acts as a switch depending on ...
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.