Oscillators & Barkhausen Criterion - Basic Introduction

This electronics video tutorial provides a basic introduction into oscillators and the barkhausen criterion. An oscillator consists of an amplifier and an attenuation network providing positive regenerative feedback. In order for sustain oscillations to occur, the amplifier and the positive feedback network must provide a total phase shift of 360 degrees to reinforce the oscillations at the input. In addition, the loop gain (product of the voltage gain and the attenuation factor) must be nearly equal to 1 for oscillations to continue.

Transistors - NPN & PNP:

Operational Amplifiers:

Summing Amplifiers:

LM386 Audio Amplifier Circuit:

LC Oscillator Tank Circuit:

A Simple Oscillator Circuit:

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A Simple Sine Wave Oscillator Circuit:

The Transistor Oscillator Circuit:

LED Flasher Circuit:

RC Phase Shift Oscillator Circuit:

Wien Bridge Oscillator Circuit:

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Colpitts Oscillator Transistor Circuit:

Hartley Oscillator Circuit:

Single Transistor Esaki Oscillator Circuit:

Single Transistor LED Flasher Circuit:

What Is Negative Resistance?

Colpitts Crystal Oscillator Circuit:

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Final Exams and Video Playlists:

Full-Length Videos and Worksheets:

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This was a great lecture; he explained in basic terms the nature of oscillator and what it does; he derived the formulas and he showed things graphically to solidify our association between the different types of oscillators. nice!

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[james]

So, if u get a sawtooth or triangular waveform at the output it will be considered as a relaxation oscillator?

[justojuma]

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[gregorykotoch]

Are these oscillator circuits what PID feedback loops made from?

[நக்மாசெல்]

I didnot get the answer... How a constant DC voltage become an oscillating voltage in an inverted amplifier. Any way you need an oscillating input

[ecebranchpit]

why amplifier circuit is necessary in an oscillator?