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Amplifiers and Oscillators | Loop and Break

Category: Amplifiers and Oscillators

Amplifiers and Oscillators

Audio Oscillators

Audio Oscillators

Audio oscillators are used in myriad electronic devices including doorbells, ambulance sirens, electronic games, telephone sets, and toys that play musical tunes. All AF oscillators are, in effect, AF amplifiers with positive feedback. Audio...

Oscillator Stability

Oscillator Stability

In an oscillator, the term stability has two meanings: constancy of frequency (or minimal frequency drift), and reliability of performance. Constancy of Frequency When designing a VFO of any kind, it’s essential that the...

Common Oscillator Circuits

Common Oscillator Circuits

Many circuit arrangements can be used to produce oscillation. The following several circuits are all known as variable-frequency oscillators (VFOs), because their frequencies are adjustable over a wide range. The Armstrong Circuit An Armstrong...

How Oscillators Work

How Oscillators Work

Once you know how amplifiers work, it’s easy to understand oscillators. All oscillators are amplifiers with positive feedback. In radio communications, oscillators generate the waves, or signals, that are ultimately sent over the air....

Audio Amplification

Audio Amplification

The circuits you’ve seen so far have been general, not application-specific. With capacitors of several microfarads, and when biased for class A, these circuits are representative of audio amplifiers. Frequency Response High-fidelity audio amplifiers,...

Drive and Overdrive

Drive and Overdrive

At A, an oscilloscope display of the signal output waveform from a properly operating class B power amplifier. At B, a display showing distortion in the waveform caused by overdrive. Class A and AB1...

Efficiency in Power Amplifiers

Efficiency in Power Amplifiers

In power amplification, efficiency is important. It not only provides optimum output power with minimum heat generation and minimum strain on the transistors, but it conserves energy as well. This translates into reduced cost,...

Amplifier Classes

Amplifier Classes

Amplifier circuits can be categorized as class A, class AB, class B, and class C. Each class has its own special characteristics, and works best in its own unique set of applications. The Class...

JFET Amplifier

JFET Amplifier

An amplifier circuit with an FET. Component designators are discussed in the text. Above figure shows an N-channel JFET hooked up as a common source amplifier. The input signal passes through C2 to the...

The Decibel

The Decibel

The human senses of hearing and vision don’t perceive the intensity of sound and light in a linear manner. Instead, our perception of these phenomena is logarithmic. Electronic circuits behave in a similar way...