27-08-2022, 04:07 AM
MOSFETS can do some very funny things when you test them out of circuit with a meter.
The gates hold charge leaving them switched hard on so you have to remember to discharge the gate before each test.
If all you have is a car brake light bulb put your MOSFET on a heat sink and connect the bulb from B+ and drain and B- to source. A dashboard indicator bulb will not need the heat sink.
Connect the gate to a pin next to pins with B+ and B- on them and rub your finger over them and you will find that you have got a completely analogue light dimmer. You will also get a feel for how long the gate stores charge for.
The gates hold charge leaving them switched hard on so you have to remember to discharge the gate before each test.
If all you have is a car brake light bulb put your MOSFET on a heat sink and connect the bulb from B+ and drain and B- to source. A dashboard indicator bulb will not need the heat sink.
Connect the gate to a pin next to pins with B+ and B- on them and rub your finger over them and you will find that you have got a completely analogue light dimmer. You will also get a feel for how long the gate stores charge for.
