Specialized Electronic Devices

3.0 1 Review SKU: ICSED00CENDuration: 60 Minutes

This course covers several categories of semiconductor devices that have unique characteristics. The specific devices covered include zener diodes, tunnel diodes, light-emitting diodes, light-sensing diodes, unijunction transistors, silicon-controlled rectifiers, and field effect transistors. To understand the operation of these devices and to be able to troubleshoot circuits that contain them, technicians must be familiar with their special characteristics as well as with basic semiconductor principles.

Course Details

Specs

Training Time: 60 minutes

Compatibility: Desktop Only

Based on: Industry Standards and Best Practices

Languages: English

Learning Objectives

  • Upon completion of this module, the student will be able to:
  • For a given direction of change in bias voltage, determine the direction of change in depletion region resistance. Use a voltage-current graph to determine current flow for a given magnitude and polarity of bias voltage.
  • Using a voltage-current graph, explain the relationship between current and voltage of a zener diode when it is forward biased and when it is reverse biased.
  • Explain how a zener diode can regulate the voltage to a load.
  • Using a voltage-current graph, explain the relationship between voltage and current of a tunnel diode when it is forward biased and when it is reverse biased.
  • Explain what happens when a tunnel diode has negative resistance.
  • Explain how light-emitting diodes and light-sensing diodes differ from conventional diodes.
  • Demonstrate two typical uses of a light-emitting diode and explain the operation of each.
  • Differentiate between photovoltaic and photoconductive light-sensing diodes. Describe the construction of a unijunction transistor (UJT).
  • Explain how and why a UJT fires.
  • Describe the operation of a UJT in a typical oscillator circuit.
  • Describe the construction of a silicon-controlled rectifier (SCR) and show the effect of applying a negative potential to the cathode and a positive potential to the anode.
  • Define the following terms: forward breakover voltage, holding current, gate, and gate potential.
  • Describe or demonstrate the effect of applying different potentials to an SCR gate.
  • Demonstrate two ways of reducing current flow through an SCR. Given an AC circuit containing an SCR and a UJT, show how the DC output from the SCR can be controlled.

Customer Reviews

2/19/2019

Some of the terms in the test are not well defined, for example zener voltage, breakdown voltage, a

“Some of the terms in the test are not well defined, for example zener voltage, breakdown voltage, avalanche voltage. The section on MOSFETs gives you just enough to be dangerous, it could/should be a course on its own with some more JFET info to fill the gap.”

ROBERT D. Verified Customer

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