MOSFET Type Clarification

The device Q1 in your schematic is an N-channel MOSFET, not an NPN transistor.
MOSFETs and BJTs (which come in NPN and PNP types) are different types of transistors. NPN devices refer to a type of bipolar junction transistor (BJT), whereas an N-channel MOSFET is a voltage-controlled device.
what is an n channel mosfet
An N-channel MOSFET is a type of field-effect transistor (FET) that uses electrons as the majority charge carriers. Key points include:
  • Structure: It has three terminals: Gate, Drain, and Source.
  • Operation: Applying a positive voltage to the Gate (relative to the Source) creates a conductive channel between the Drain and Source, enabling current to flow.
  • Usage: They are widely used for switching and amplification in electronic circuits due to their low resistance when on and fast switching characteristics.
This differentiates it from BJTs (like NPN transistors) which are current-controlled devices, whereas an N-channel MOSFET is voltage-controlled.
Explanation of N-channel MOSFET
Ask about using N-channel MOSFET in my circuit
Get characteristics of N-channel MOSFET
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