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Field Effect Transistors

The field effect transistor is a component that uses only one junction instead of two as in bipolar transistors. Even though it is only one junction that also functions like a diode, the actual layout of the materials make it have some properties that allow a single junction device function like a transistor.

The layout of the FET is a bar of semiconductor material that has a ring of an oppositely doped semiconductor material around it. This Transistor is called the junction field effect transistor or JFET.

There are two types of JFET, called N-channel and P-channel. The name comes from the type of material that makes up the bar of material, for example the N-channel is a bar of N material with a ring of P material around it.

The explanations here are given for P-channel JFETs, as with bipolar transistors, just reverse polarities for N-channel JFETs.

Similar to the Bipolar transistors, FETs have three terminals, Source, Gate and Sink that correspond in function to the Collector, Base and Emitter of the BJT, respectively

Welcome To Electronic Circuits For Beginners!

All circuits included here are recommended to be assembled in printed circuit boards. Printed circuit boards, or PCB's increase the circuit reliability and mechanical stability.

Circuits quick links:

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Simple FM Transmitter

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Led Flasher Circuit

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Quadrocopters for beginners

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Voltage follower circuit

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Beginners Audio Amplifier

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Led chaser circuit

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Tone generator circuit

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H bridge circuit

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Simple power supply

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Beginner Electronics mini course index

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All circuits include parts list and complete How-it-works for beginners and hobbyists to easily understand.