FET-Circuits-Rufus-Turner.pdf

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FET Circuits
by
Rufus P. Turner
4300 WEST 62ND ST. INDIANAPOLIS. INDIANA 46268 USA
Howard W. Sams & Co., Inc.
Preface
Copyright © 1967 and 1977 by
Howard W. Sams & Co., Inc.,
Indianapolis, Indiana 46268
impedance, a feature that makes it more adaptable than the
conventional (or bipolar) transistor to tube -type circuits. But
it also possesses those qualities that recommend all transistors
:
simplicity ;
small size ;
ruggedness ;
instant operation ;
high
overall efficiency; and freedom from hum,
microphonics, and,
in most cases, generation of heat.
Now that the FET is commercially available at comfortable
prices, designers and experimenters at all levels are showing
interest in its applications. This book attempts to meet the de-
mand for practical information on the subject.
The chief merit of the field-effect transistor is its
high input
Second Edition
First Printing -1977
All rights reserved. Reproduction or use, without
express permission, of editorial or pictorial content,
in any manner, is prohibited. No patent liability is
assumed with respect to the use of the information
contained herein. While every precaution has been
taken in the preparation of this book, the publisher
assumes no responsibility for errors or omissions.
Neither is any liability assumed for damages resulting
from the use of the information contained herein.
The numerous tested circuits described
on the following
pages cover the field of applications from amplifiers to test in-
struments and will be especially interesting to
experimenters
and hobbyists. (A great
many of the circuits contain only one
or two FE Ts.) This collection is made up of circuits that
sur-
vived impartial tests to eliminate those that
gave only margi-
nal performance.
The reader may use these circuits singly
or in such combina-
tions as his needs suggest. The present collection by
no means
exhausts the possibilities of FET application; therefore,
many
of these circuits might also serve as idea generators.
The author is grateful to Siliconix Inc. and to Texas Instru-
ments, Inc., who kindly supplied operating data and
generous
International Standard Book Number: 0-672-21439-6
Library of Congress Catalog Card Number: 77-72611
Printed in the United States of America.
samplings of their field-effect transistors for use in developing
the circuits described in this book.
In the several years since the first edition of FET Circuits
appeared, field-effect transistors have become firmly
established
in solid-state electronics. At the same time, new types
have
entered the market, some of the original types are no longer
manufactured, and additional applications have come
forth.
This second edition of FET Circuits contains revisions
of
diagrams and text necessitated by this progress
in field-effect
transistors. Several new circuits also have been added,
and
some of the descriptions have been
reworded for increased
clarity.
RUFUS P. TURNER
Contents
CHAPTER 1
FUNDAMENTALS OF THE FET
The Field Effect-Background of the FET-FET Structure
and Operation - FET Performance - FET Ratings - FET
Types
CHAPTER 2
AMPLIFIER CIRCUITS
19
Simple Small -Signal AF Preamplifier-Single-Stage, Low -
Gain AF Preamplifier-Single-Stage, Medium -Gain AF Pre-
amplifier-AF Source Follower-Two-Stage, RC -Coupled AF
Amplifier-Two-Stage, Transformer -Coupled AF Amplifier-
High-Impedance Input for Bipolar Transistor-High-Input-
Impedance,
High -Gain Audio
Preamplifier - Conventional
Phase Inverter-Paraphase Phase Inverter-Dual-Channel
Bandpass
Audio Mixer-LC-Tuned Bandpass AF Amplifier-RC-Tuned
AF
Amplifier - RC -Tuned
Band -Suppression
(Notch) AF Amplifier-Video Amplifier -455 -kHz I -F Am-
plifier-Auxiliary Headphone Amplifier-Simple Audio AGC
Amplifier-Simple DC Amplifier
CHAPTER 3
OSCILLATOR CIRCUITS
CHAPTER 7
43
INSTRUMENT CIRCUITS
117
Transformer -Feedback AF Oscillator-LC-Tuned AF Oscilla-
tor - Phase -Shift AF Oscillator - Single -Frequency Wien -
Bridge AF Oscillator-Drain-Coupled Multivibrator-Source-
Coupled Multivibrator-Self-Excited RF Oscillator-Conven-
tional Crystal Oscillator-Pierce Crystal Oscillator -110 -kHz
Crystal
Oscillator-Colpitts AF Oscillator-Code-Practice
Oscillator-Flip-Flop
Single-FET Electronic DC Voltmeter-Balanced Electronic
DC Voltmeter-Electronic AC Voltmeter-Electronic AC Volt-
meter/Millivoltmeter - Crystal Dual -Frequency Standard -
100-kHz/10-kHz Secondary Frequency Standard - Direct -
Reading Audio -Frequency Meter - 4.5 -MHz Sound -Marker
Generator-Variable-Frequency Audio Oscillator-Dip Oscil-
lator-AF Milliammeter-Inductance Checker-Substitution-
Type Capacitance Meter-Impedance Meter-Heterodyne Fre-
quency Meter - Harmonic -Distortion Meter - AF RF Signal
Tracer Geiger Counter-Electroscope
APPENDIX A
TERMINAL GUIDE FOR DIODES AND TRANSISTORS
.
CHAPTER 4
RECEIVER AND RECEIVER -ACCESSORY CIRCUITS .
.
61
Superhet Broadcast Receiver - Regenerative Broadcast Re-
ceiver-All-Wave Regenerative Receiver-Single-Frequency,
Crystal -Controlled Converter-Beat-Frequency Oscillator-Q-
Multiplier - "Selectojet" - Audio Squelch Amplifier - Drain
Detector-Infinite-Impedance Detector-Simple RF Mixer-
Cascode Preselector
155
APPENDIX B
MANUFACTURERS OF SEMICONDUCTORS
157
CHAPTER 5
.
TRANSMITTER AND TRANSMITTER -ACCESSORY CIRCUITS
Single -Stage
Crystal -Controlled
Transmitter - Single -Stage
79
INDEX
158
0.8 -Watt Crystal -Controlled Transmitter-Two-Stage Trans-
mitter-Push-Pull Final Amplifier -100 -MHz Grounded -Gate
Amplifier - Single -Ended Frequency Multiplier - Push -Push
Doubler - Four -Band Exciter - Balanced Modulator - CW
Monitor-Modulating the FET Transmitters-Single-Control
("TNT") Transmitter-Phone Monitor-Variable-Frequency
Oscillator (VFO)-Buffer for VFO
CHAPTER 6
CONTROL CIRCUITS
101
DC Relay-AC RF Relay-Touch-Plate Relay-Amplified
Photocell-Timer-FET as Voltage -Variable Resistor-Con-
stant-Current Source-Sensitive AC AF Relay-Sound-Oper-
ated
Relay - Modulated -Light Detector/Amplifier - Phase
Shifter

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