Zener Diode Voltage Regulation
By Terry Bartelt
In this animated and interactive object, learners examine how changes in applied voltage affect the current and voltages in a zener diode voltage regulation circuit. A short assessment completes the activity.
Waveforms of an SCR Circuit
Learners view waveforms at various locations of an SCR circuit controlling the intensity a light bulb. The waveforms are shown when the light is dim, at medium brightness, and at full brightness. A brief quiz completes the activity.
Waveforms of a Triac Circuit
Learners observe the waveforms in a circuit in which a triac controls the brightness of a lamp’s light. A brief quiz completes the activity.
Voltage Measurements of a Half-Wave Rectifier
In this animated lesson, students view how an oscilloscope and a DC voltmeter measure the voltage of a half-wave rectifier.
Transistor Fundamentals: The MOSFET
By Patrick Hoppe
Students read an introduction to the Metal Oxide Semiconductor Field Effect Transistor. They also examine its enhancement mode.
Transistor Fundamentals: Review of Logarithms
Students review logarithms as they pertain to electronics.
Transistor Fundamentals: Junction Field Effect Transistor (JFET)
Students read about the common characteristics of the Junction Field Effect Transistor. They also explore the schematic symbols and the basic operation of the JFET.
Transistor Fundamentals: JFET Drain Curves
Students examine the drain curves for a JFET. They are also introduced to vocabulary terms and formulas.
Transistor Fundamentals: JFET Amplifiers
Students read an explanation of the common-source and source-follower amplifiers. Gain formulas are developed and an example is given.
Transistor Fundamentals: Frequency Response Vocabulary
Students read the vocabulary associated with frequency response as it relates to an amplifier.
Transistor Fundamentals: E-MOSFETs, the Ohmic Region
The ohmic region of the E-MOSFET is identified. Formulas are given to determine the proper operation in the ohmic region. An example of circuit analysis is also given.
Transistor Fundamentals: Emitter-Biased NPN Transistor
Students view a dc analysis of an emitter-biased NPN transistor.
Transistor Fundamentals: Decibel Gain, Power, and Voltage
Students read about decibel power gain and decibel voltage gain. Examples are given for each.
Transistor Fundamentals: Collector Saturation and Collector-Emitter Cutoff
Students read about the concepts of saturation and cutoff. They view diagrams that illustrate the interaction of the load line and the family of curves.
Transistor Fundamentals: Classes of Operation
Students read about the three main classes of amplifiers and view graphical representations of the collector current and circuit.
Transistor Fundamentals: Base-Biased NPN Transistor
Students view a dc analysis of a base-biased NPN transistor.
Transistor Fundamentals: AC Models
Students read about the four steps to creating an ac model and view examples.
Transistor Fundamentals: AC Model Equations
Students view the equations used to determine the ac parameters of the transistor circuit.
Transistor Fundamentals: AC Coupling Capacitors
Students view the design and function of an ac model for a transistor circuit.
Transistor Fundamentals: Voltage-Divider Biased NPN Transistor
Students view drawings of the dc analysis of a voltage-divider biased NPN transistor.
Transistor Fundamentals: AC Bypass Capacitors
Students view drawings of the emitter resistor bypass capacitor.
Transistor DC Analysis Practice Problems: Circuit #5
Learners analyze an emitter-biased npn transistor circuit. A "help" screen is available.
Transistor DC Analysis Practice Problems: Circuit #4
Transistor DC Analysis Practice Problems: Circuit #3
Transistor DC Analysis Practice Problems: Circuit #2
Learners analyze a base-biased npn transistor circuit. A "help" screen is available.