How to use an N-Channel MOSFET like an NPN Transistor as a switch

215

05:08:19

Without the 1M ohm resistor, the mosfet would stay open even if the switch was opened again.

You want to use a 1M ohm resistor in order to create as little current as possible 
(12V/1 000 000R = 0.000012A)

I found it difficult to understand the difference in usage between a BJT and a MOSFET, I hope this will help those with the same issue.

Have fun experimenting!

published 10 years ago

rich11292000

10 years ago

The n channel goes after the load, being connected to the negative of the battery. P channel should connect to the positive of the battery.

hurz

10 years ago

Depends on what you want, rich! But most beginners prefer by magic a source follower.

TimoM

10 years ago

@rich11292000 Oh okay, thank you! I didn't know that ;)

GingerKing

10 years ago

A BJT is is a current controlled transistor while a FET is a voltage controlled transistor. Also a transistor is more like an amplifier than a switch. Good luck

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