FET Characteristics Apparatus

Quick Answer: The FET Characteristics Apparatus is an electronics lab unit used to study a Field Effect Transistor (FET) — plotting its drain characteristics (V-DS vs. I-D) and transfer characteristics (V-GS vs. I-D) to help students understand voltage-controlled device behaviour as distinct from a bipolar junction transistor.

Unlike a BJT, a Field Effect Transistor is controlled by gate voltage rather than base current, and this apparatus gives students a panel-mounted FET with Drain, Source, and Gate terminals brought out for external wiring. By varying the gate-source voltage and sweeping the drain-source voltage, students record drain current readings to plot both the drain and transfer characteristic curves and identify the pinch-off and saturation regions.

This apparatus is used in undergraduate electronics and electrical engineering labs, diploma and polytechnic courses, wherever the syllabus covers FET operation as part of analog electronics or semiconductor device fundamentals — typically alongside BJT characteristics experiments for direct comparison.

Key Features

• Panel-mounted FET with labelled Drain (D), Source (S), and Gate (G) terminals
• Supports plotting of both drain characteristics and transfer characteristics
• Helps students identify the ohmic, saturation, and pinch-off regions of FET operation
• Compact bench-top layout for use with an external DC supply and standard meters
• Useful for side-by-side comparison with BJT characteristics experiments

Specifications

Safety Note

Keep gate-source and drain-source voltages within the safe range for the mounted FET to avoid damaging the device, and observe correct terminal polarity when wiring Drain, Source, and Gate connections. Use a current-limited DC supply, avoid exceeding the FET’s rated drain current, and disconnect the supply before changing any wiring. Recommended for supervised use in a teaching lab setting.

Why Choose LabEquip

LabEquip supplies electronics and electrical trainer apparatus to engineering colleges, polytechnics, and technical training institutes. Explore related boards and modules from our Electrical and Electronics range to build out a complete semiconductor devices lab:

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• Arduino Mega 2560 Board

Frequently Asked Questions

What does the FET Characteristics Apparatus demonstrate?

It demonstrates both the drain characteristics (V-DS vs. I-D) and transfer characteristics (V-GS vs. I-D) of a Field Effect Transistor, helping students visualise voltage-controlled device behaviour.

How is a FET different from a BJT in this experiment?

A FET is controlled by gate voltage rather than base current, so the apparatus lets students compare voltage-controlled (FET) versus current-controlled (BJT) transistor behaviour when both experiments are run side by side.

What terminals does the apparatus expose?

It exposes the Drain (D), Source (S), and Gate (G) terminals of the mounted FET for connection to an external DC supply and meters.

Is the FET device included with the apparatus?

This is not specified for the current listing. Please confirm exactly what is included with our sales team before ordering.

What regions of FET operation can be identified from the readings?

Students can identify the ohmic (linear), saturation, and pinch-off regions of FET operation from the drain characteristic curves plotted using this apparatus.

Who is this apparatus intended for?

It is intended for undergraduate electrical/electronics engineering students, diploma and polytechnic learners, and technical training institutes covering FET characteristics as part of an analog electronics course.

Last Updated: September 2026