NMOS & PMOS: Useful Applications




First lets briefly look at the two variations of MOSFETs.

You have the N-Channel MOSFET below:


Then, you have the P-Channel MOSFET below:

Image - PMOS.png



Now, onto the main event:

1. Using them as digitally controlled switches.


Here comes the FETs to the rescue.







2. Using them as logic level converters[1]






3. Making a constant current source.






Enjoy building :)!


1. Bi-Directional Level Shifting

2. Sparkfun Learning

2 thoughts on “NMOS & PMOS: Useful Applications

    • Hey PRJ, the difference is that transistors are current based and MOSFETS are voltage based. When you apply a voltage higher than 0.7 on a transistor you need to add a series resistor on the base to limit the current. With a MOSFET, the resistance at the gate is in the mega ohm range so you do not need to add a series resistor just a voltage high enough to turn on the MOSFET.

      Another major difference is that the MOSFET is a lot more efficient to use in power related projects because the resistance between the drain and source is in the milli-ohm range essentially acting as a single pole switch. You have a lot more power loss in the transistor.

      If you are still confused and/or you need a little more explanation just let me know ill be happy to elaborate.

      Liked by 1 person

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