July 2012
Beginner
576 pages
9h 46m
English
Content preview from Complete Electronics Self-Teaching Guide with Projects
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Practical Oscillator Design
26 This section briefly covers some practical problems with oscillators.
Before you proceed, review the important points of this chapter by answering the following questions.
Questions
A. What three elements must an oscillator have present to work? _____
B. What determines the frequency of an oscillator's output signal?
C. What provides the feedback?
D. How many feedback methods for oscillators have been discussed?
E. What do you need to start the oscillations once the circuit has been built?
Answers
A. An amplifier, a resonant LC circuit (or some other frequency determining components), and feedback.
B. The frequency of the output signal is the same as the resonance frequency.
C. A voltage divider on the resonant circuit.
D. Three: the Colpitts, Hartley, and the Armstrong.
E. Nothing: The oscillations should start spontaneously if the component values in the circuit are correct.
The main practical problem with building oscillators is selecting the coil. For mass production, a manufacturer can specify and purchase the exact coil required. But in a lab or workshop (where you are building only a single circuit), it is often difficult or impossible to find the exact inductor specified in a circuit design. What usually happens is that you use the most readily available coil, and design the rest of the circuit around it. This presents three possible problems:
- You may not know the exact value of the inductance.
- The inductance value may ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.