July 2012
Beginner
576 pages
9h 46m
English
Content preview from Complete Electronics Self-Teaching Guide with Projects
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The Hartley Oscillator
25 Figure 9.27 shows a Hartley oscillator circuit. In this type of circuit, the feedback is taken from a tap on the coil, or from a connection between two inductors.
Capacitor CL stops the emitter DC voltage from being pulled down to 0 volts through the coil. CL should have a reactance of less than RE/10, or less than 160 ohms at the oscillator frequency.
Questions
Work through the following calculations:
A. What is the resonance frequency?
fr = _____
B. What is the approximate impedance of the load? Z = _____
C. What missing information prevents you from calculating the fraction of the voltage drop across the coil that is fed back to the emitter?
Answers
A. 80 Hz (approximately).
B. 7.7 kΩ (approximately).
C. The number of turns in the coil and the position of the tap are not known.
Figure 9.28 shows a Hartley oscillator with the parallel LC circuit connected between the collector and the supply voltage. As with the circuit shown in Figure 9.27, this circuit provides a feedback signal to the emitter from a tap in the coil, in the correct phase to provide positive feedback.
Project 9.2: The Hartley Oscillator
Objective
The objective of this project is to demonstrate a Hartley oscillator using two inductors in ...
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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.