Electronics-Designer's-Casebook-2.pdf

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Electroni
loszonors
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PREPARED BY
THE EDITORS OF
Electronics
Second in a continuing series of selected Designer's Case-
book sections of Electronics magazine. This edition includes
Electronics issues from March 31, 1977 through February 2,
1978. Also included are feature articles and items from Engi-
neer's Notebook of particular interest to the circuit designer.
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Price: $5.00 North America
$12.00 outside North America
Printed in U.S.A.
All material copyrighted by
Electronics
McGraw-Hill, Inc.
1221 Avenue of the Americas
New York, New York 10020
CONTENTS
AUDIO AND ANALOG
Automatic gain control has 60 -decibel range
Sample -and -hold and op amp form special differentiator
FET pair and op amp linearize voltage -controlled resistor
Automatic clamp controls symmetrical wave -form offset
Bi-FET devices improve absolute -value amplifier
Double -ended clamp circuit has ideal characteristics
C-MOS twin oscillator forms micropower metal detector
Keyboard programs the gain of an operational amplifier
Accurate thermometer uses single quad op amp
Bias -current network improves sample -and -hold response
Time-shared DVM displays two inputs simultaneously
3
7
8
10
11
36
55
57
67
70
72
CONTROL
Comparators replace mechanical set -point meter
One-shot multivibrator has programmable pulse width
Darlington -switched relays link car and trailer signal lights
555 timer isolates equipment from excessive line voltage
Resettable electronic fuse consists of SCR and relay
Timer IC circuit separates rep rate and duty cycle control
Synchronous timing loop controls windshield wiper delay
Diode sensor and Norton op amp control liquid -nitrogen level
Expanded test inputs increase 4004 processor capability
20
22
33
37
38
48
50
66
68

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