Hello. I'm quite rusty with electronics, so here's my task.I need to switch on and off the power supply to a 6.5V device (another microcontroller) which will drain 100mA max. The frequency of switching will be a Hz or less. I'm thinking about using a MOSFET as a switch which would be controlled by Arduino.If that's the way to go, any tips about what I should pay attention to when choosing the MOSFET.Also I'd like to protect the load against voltage spikes that might occur during the switch. Would a zener diode suffice?Thanks for your time and answers/tips.
Unless there is some inductance in the circuit you failed to disclose, there are no voltage spikes.Paul
Something like this might work.https://www.digikey.com/products/en?keywords=vp2206
Ease my mind. I know it's not really needed, guess I have a mental aversion to hooking things directly to a transistor base, it can be dispensed with.
Low side switching with an n-channel MOSFET is easier. Normally you'd switch low side unless there's a very specific reason not to.
Such as switching power to another microcontroller perhaps?
No, actually, it is not "it can be dispensed with", it is an error. Albeit not particularly critical in this case.