Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 12: Problem 5

A class A transformer-coupled amplifier uses a \(25: 1\) transformer to drive a \(4-\Omega\) load. Calculate the effective ac load (seen by the transistor connected to the larger turns side of the transformer).

Short Answer

Expert verified
The effective AC load (seen by the transistor connected to the larger turns side of the transformer) is \(2500 \, \Omega\)

Step by step solution

01

Identify given parameters

From the exercise, the given parameters are Transformer Turns Ratio \(\frac{N_{primary}}{N_{secondary}} = 25:1\) (meaning \(N = 25\)) and Secondary Impedance \(Z_{secondary} = 4 \, \Omega\)
02

Apply the impedance transformation formula

The formula states that \(Z_{primary} = N^2 \times Z_{secondary}\), where \(Z_{primary}\) is the impedance seen by the transistor, \(N\) is the ratio of primary to secondary turns (or \(25\)), and \(Z_{secondary}\) = \(4\, \Omega\) is the single impedance of the load. Insert these values into the formula to calculate \(Z_{primary}\)
03

Calculate Z_primary

Plugging the given values into the formula results in \(Z_{primary} = 25^2 \times 4 \, \Omega = 625 \times 4 \, \Omega = 2500 \, \Omega\)

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Calculate the transformer turns ratio required to connect four parallel \(16-\Omega\) speakers so that they appear as an \(8-\mathrm{k} \Omega\) effective load.

Draw the circuit diagram of a class A transformer-coupled amplifier using an \(n p n\) transistor.

Calculate the harmonic distortion components for an output signal having fundamental amplitude of \(2.1 \mathrm{~V}\), second harmonic amplitude of \(0.3 \mathrm{~V}\), third harmonic component of \(0.1 \mathrm{~V}\), and fourth harmonic component of \(0.05 \mathrm{~V}\).

A transformer-coupled class A amplifier drives a \(16-\Omega\) speaker through a \(3.87: 1\) transformer. Using a power supply of \(V_{C C}=36 \mathrm{~V}\), the circuit delivers \(2 \mathrm{~W}\) to the load. Calculate: a. \(P(\) ac \()\) across transformer primary. b. \(V_{L}(\mathrm{ac})\). c. \(V(\mathrm{ac})\) at transformer primary. d. The rms values of load and primary current.

Determine the maximum dissipation allowed for a \(100-\mathrm{W}\) silicon transistor (rated at \(25^{\circ} \mathrm{C}\) ) for a derating factor of \(0.6 \mathrm{~W} /{ }^{\circ} \mathrm{C}\) at a case temperature of \(150^{\circ} \mathrm{C}\).
See all solutions

Recommended explanations on Physics Textbooks

Rotational Dynamics

Read Explanation

Work Energy and Power

Read Explanation

Electromagnetism

Read Explanation

Physics of Motion

Read Explanation

Wave Optics

Read Explanation

Classical Mechanics

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free