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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
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The entries are in alphabetical order by magazine name and then in chronological sequence.
To obtain a copy of any magazine article contact your local public library or the publisher.

x   OP AMP

IC op amps for audio. Part 1. An introduction to the benefits and use of operational amplifiers in audio circuits.
AUDIO AMATEUR 2/1973 [Apr 1974] (v.4#2) pg. 28

How to beef up an op amp (in terms of power and slew rate) with two resistors and a complementary pair of transistors.
AUDIO AMATEUR 1/1974 [Oct 1974] (v.5#1) pg. 22

IC op amps for audio. Part 2. Reading a typical op amp specification sheet. A review of op amp theory.
AUDIO AMATEUR 1/1974 [Oct 1974] (v.5#1) pg. 23
Added Info AUDIO AMATEUR 1/1975 [Jun 1975] (v.6#1) pg. 43

IC op amps for audio. Part 2 (continued). Reading a typical op amp specification sheet (continued). Construction of an IC op amp checker
AUDIO AMATEUR 2/1974 [Dec 1974] (v.5#2) pg. 18
Correction AUDIO AMATEUR 3/1974 [Feb 1975] (v.5#3) pg. 37
Correction AUDIO AMATEUR 4/1974 [Apr 1975] (v.5#4) pg. 39

Op amps for audio. Part 3. Regulated power circuits (RC filter, voltage regulator, power supply).
AUDIO AMATEUR 4/1974 [Apr 1975] (v.5#4) pg. 14
Correction AUDIO AMATEUR 2/1975 [Nov 1975] (v.6#2) pg. 38

Audio performance tests for IC op amps. Part 1.
AUDIO AMATEUR 2/1978 [Jun 1978] (v.9#2) pg. 32

Noise control in IC op amps for audio. How to design for the lowest noise with ICs.
AUDIO AMATEUR 3/1978 [Sep 1978] (v.9#3) pg. 27

Tip on using four-pin CB radio mike connectors as power supply connectors when wiring split power supplies to op amp devices.
AUDIO AMATEUR 4/1979 [Oct 1979] (v.10#4) pg. 55

A high quality power supply (voltage) regulator for use with any IC operational amplifier audio preamplifier.
AUDIO AMATEUR 2/1980 [Mar 1980] (v.11#2) pg. 8
Correction AUDIO AMATEUR 4/1980 [Nov 1980] (v.11#4) pg. 63
Added Info AUDIO AMATEUR 1/1981 [Feb 1981] (v.12#1) pg. 10
Added Info AUDIO AMATEUR 2/1981 [Apr 1981] (v.12#2) pg. 58, 62
Correction AUDIO AMATEUR 3/1981 [Jun 1981] (v.12#3) pg. 48
Added Info AUDIO AMATEUR 3/1981 [Jun 1981] (v.12#3) pg. 54
Correction AUDIO AMATEUR 4/1985 [Oct 1985] (v.16#4) pg. 54
Added Info AUDIO AMATEUR 1/1986 [Feb 1986] (v.17#1) pg. 55, 57
Added Info AUDIO AMATEUR 2/1986 [May 1986] (v.17#2) pg. 49
Added Info AUDIO AMATEUR 1/1994 [Mar 1994] (v.25#1) pg. 36

A gain of ten amplifier. A battery operated amplifier of precise gain to use as a preamp for a distortion analyzer, or as an output amp for a low output signal generator.
AUDIO AMATEUR 2/1986 [May 1986] (v.17#2) pg. 23

Small configuration circuit board to alter the RC4136 pinout to a standard 4-pack op amp pinout.
AUDIO AMATEUR 2/1990 [Apr 1990] (v.21#2) pg. 68

How clean is your audio op amp? A scholarly analysis of harmonic distortion versus noise. Includes test results of numerous op amps.
AUDIO AMATEUR 4/1993 [Dec 1993] (v.24#4) pg. 10
Added Info AUDIO AMATEUR 3/1994 [Sep 1994] (v.25#3) pg. 43
Added Info AUDIO AMATEUR 4/1994 [Dec 1994] (v.25#4) pg. 49
Added Info AUDIO AMATEUR 1/1995 [Jan 1995] (v.26#1) pg. 46

Choosing low-noise op amps for use in audio equipment.
AUDIO AMATEUR 2/1994 [Jun 1994] (v.25#2) pg. 25
Added Info AUDIO AMATEUR 1/1995 [Jan 1995] (v.26#1) pg. 50
Added Info AUDIO ELECTRONICS 2/1997 [Apr 1997] (v.28#2) pg. 37

Taming op amp distortion.
AUDIO AMATEUR 4/1995 [Nov 1995] (v.26#4) pg. 12

Do-it-yourself op amps. Design and make operational amplifiers (to fill a specific need) from as few as six discrete components costing less than $1. Part 1.
AUDIO ELECTRONICS 6/1998 [Dec 1998] (v.29#6) pg. 8

Do-it-yourself op amps. Part 2. Construction.
AUDIO ELECTRONICS 1/1999 [Jan 1999] (v.30#1) pg. 24

A brief discussion of current pulldown on op amps.
AUDIOXPRESS Aug 2001 (v.32#8) pg. 77

Universal test board for SMT operational amplifiers.
AUDIOXPRESS Jun 2002 (v.33#6) pg. 26

Hybrid solid-state power amplifiers. (1) Current-boosted op amp. (2) Current- and voltage-boosted op amp. (3) Boosted cascoded op amp. (4) Driven supply op amp.
AUDIOXPRESS Jul 2003 (v.34#7) pg. 6

The Modern Electronics computer experimenter lab. Part 4. Understanding and using operational amplifiers.
COMPUTERCRAFT May 1991 (v.1#2) pg. 26

The Modern Electronics computer experimenter lab. Part 5. Understanding and using operational amplifiers (continued). More on building operational-amplifier circuits.
COMPUTERCRAFT Jun 1991 (v.1#3) pg. 44

Circuits show unconventional uses for operational amplifiers, including full and half-wave rectifiers.
CQ. THE RADIO AMATEUR'S JOURNAL Feb 1981 (v.37#2) pg. 46

Circuit for a basic linear-to-logarithmic amplifier (also called a "transdiode" circuit) built with a single op-amp. The current in the feedback loop of the op-amp is equal to the current flow at the input of the op-amp.
ELECTRONICS NOW Jun 1994 (v.65#6) pg. 12
Correction ELECTRONICS NOW Sep 1994 (v.65#9) pg. 18

Operational amplifiers. How to design with them and put them to work in various analog and audio circuits.
ELECTRONICS NOW Jan 1995 (v.66#1) pg. 58

Simple dead or alive test circuit for op-amps.
ELECTRONICS NOW Feb 1997 (v.68#2) pg. 13

Operational amplifiers, their theory and uses.
ELEMENTARY ELECTRONICS Jul-Aug 1969 (v.8#3) pg. 45

An electronic project builds basic insight into op-amp and diode circuits. A variety of circuits in which an operational amplifier and diode are used together so that the amplifier can extract ideal performance from the diode.
ELEMENTARY ELECTRONICS Nov-Dec 1974 (v.14#6) pg. 47

Hobbyist's advanced course on op-amps. Learn to design your own op-amp circuits and understand op-amp specs. Includes an experimental test circuit.
ELEMENTARY ELECTRONICS Sep-Oct 1975 (v.15#5) pg. 79

Test surplus op-amps with this go/no go tester.
ELEMENTARY ELECTRONICS Sep-Oct 1976 (v.16#5) pg. 59

Profile of the RCA Bimos operational amplifier integrated circuits (Series CA080 through CA083).
ELEMENTARY ELECTRONICS Jan-Feb 1981 (v.21#1) pg. 63

Vacuum tube op amps applied. How tubed operational amplifiers and analog computers were used in the 1930s-1950s to simulate design ideas. Includes several vacuum tube op amp circuits.
GLASS AUDIO 3/1992 (v.4#3) pg. 12
Correction GLASS AUDIO 1/1993 (v.5#1) pg. 36
Added Info GLASS AUDIO 2/1993 (v.5#2) pg. 35, 41
Added Info GLASS AUDIO 4/1999 (v.11#4) pg. 61

Easy-to-build vacuum tube op amp for audio purposes only uses two dual triode tubes. Its performance matches IC op amps, but without the sonic trade-off usually associated with IC devices.
GLASS AUDIO 1/1995 (v.7#1) pg. 1

Designing audio amplifiers using op-amp building blocks. Includes a BASIC computer program to make the job easier.
HANDS-ON ELECTRONICS Dec 1986 (v.3#7) pg. 86

Guide to op-amps. Practical aspects of op-amp usage and tips that will help your op-amp designs.
HANDS-ON ELECTRONICS Jun 1987 (v.4#6) pg. 69
Correction HANDS-ON ELECTRONICS Sep 1987 (v.4#9) pg. 6

Electronic fundamentals. Operational amplifiers.
HANDS-ON ELECTRONICS Jul 1987 (v.4#7) pg. 75
Correction HANDS-ON ELECTRONICS Oct 1987 (v.4#10) pg. 4

Using op-amps in power-supply circuits. Experimenting with op-amp power-supply circuits promotes a deeper understanding of op-amp applications.
HANDS-ON ELECTRONICS Oct 1987 (v.4#10) pg. 59

Op-amp applications. Lab experiments to build and demonstrate op-amp circuits.
HANDS-ON ELECTRONICS Oct 1987 (v.4#10) pg. 81

Basic building-block circuits are made from the same low-cost IC, the LM324 quad op-amp. (1) AC voltage-follower. (2) Inverting amplifier. (3) Buffer amplifier. (4) Squarewave generator. (5) Instrumentation amplifier (formed by combining the above four circuits).
HANDS-ON ELECTRONICS Feb 1988 (v.5#2) pg. 76

Using op-amp comparator circuit chips to detect and measure real-world conditions. Circuits for monitoring temperature, light level, voltage, etc.
HANDS-ON ELECTRONICS Aug 1988 (v.5#8) pg. 62

Practical op-amp experiments. Introduction plus the first of 16 experiments. Construction of the op-amp module.
INDUSTRIAL EDUCATION Apr 1980 (v.69#4) pg. 40

Practical op-amp experiments. The squaring amplifier.
INDUSTRIAL EDUCATION May-Jun 1980 (v.69#5) pg. 34

Practical op-amp experiments. The voltage follower amplifier.
INDUSTRIAL EDUCATION Sep 1980 (v.69#6) pg. 23

Practical op-amp experiments. (1) Inverting amplifier. (2) Non-inverting amplifier. (3) Differential amplifier.
INDUSTRIAL EDUCATION Oct 1980 (v.69#7) pg. 30, 32, 34

Practical op-amp experiments. (1) Wein bridge oscillator. (2) Phase shift oscillator.
INDUSTRIAL EDUCATION Nov 1980 (v.69#8) pg. 56, 58

Practical op-amp experiments. Twin-T oscillator.
INDUSTRIAL EDUCATION Dec 1980 (v.69#9) pg. 30

Practical op-amp experiments. The Twin-T filter.
INDUSTRIAL EDUCATION Jan 1981 (v.70#1) pg. 32

Practical op-amp experiments. (1) The astable multivibrator. (2) The monostable multivibrator.
INDUSTRIAL EDUCATION Feb 1981 (v.70#2) pg. 32

Practical op-amp experiments. The Schmitt trigger.
INDUSTRIAL EDUCATION Mar 1981 (v.70#3) pg. 29

Practical op-amp experiments. (1) Peak follower. (2) Analog adder.
INDUSTRIAL EDUCATION Apr 1981 (v.70#4) pg. 28

Practical op-amp experiments. The transconductance amplifier. Final experiment in the series.
INDUSTRIAL EDUCATION May-Jun 1981 (v.70#5) pg. 32

Beyond op-amps. How to use special-purpose op-amps in practical and exotic circuits.
MODERN ELECTRONICS [2] Nov 1984 (v.1#2) pg. 50

How to get started in electronics. Part 2: Inside integrated circuits. Looks at diode gates, transistor gates, linear ICs, op-amps, etc.
MODERN ELECTRONICS [2] Dec 1984 (v.1#3) pg. 58

Experimenting with the analog comparator, a special circuit incorporating the operational amplifier. Circuits include (1) an adjustable light-dark detector, (2) adjustable-threshold temperature-controlled relay, (3) a sine- to square-wave converter, and (4) a peak-voltage detector.
MODERN ELECTRONICS [2] Feb 1985 (v.1#5) pg. 62

A universal rear end. This simple op-amp circuit gives frequently overlooked attention to the outputs of your project. Features include gain, gain control, dc balance control/offset null, and a position control.
MODERN ELECTRONICS [2] Apr 1985 (v.1#7) pg. 63

Using op amps. Practical applications of the ubiquitous op amp as an amplifier, a filter, and a limiter.
MODERN ELECTRONICS [2] Oct 1985 (v.2#4) pg. 26

A discrete-component high-frequency op amp. Gives good performance at frequencies to 4 MHz and beyond.
MODERN ELECTRONICS [2] Jun 1986 (v.3#6) pg. 59
Correction MODERN ELECTRONICS [2] Oct 1986 (v.3#10) pg. 5

Understanding electronic feedback. Includes feedback demonstration circuits, operational amplifiers, phase-locked loops, and servomechanisms.
MODERN ELECTRONICS [2] Jun 1986 (v.3#6) pg. 73

Using the operational transconductance amplifier (OTA). Discover the advantages of working with this often-disregarded member of the op-amp family.
MODERN ELECTRONICS [2] Sep 1986 (v.3#9) pg. 48

Using op amps to generate signals. A low-cost way to obtain the sine, square, triangle and sawtooth waves called for in many modern analog and digital circuits.
MODERN ELECTRONICS [2] May 1987 (v.4#5) pg. 26
Correction MODERN ELECTRONICS [2] Jul 1987 (v.4#7) pg. 5

Using current-differencing operational amplifiers. A specialized op amp that can simplify circuit designs by eliminating the need for a second power supply.
MODERN ELECTRONICS [2] Sep 1987 (v.4#9) pg. 36

Choosing op amps for specific applications. Examining the important specifications for making intelligent choices of what operational amplifier to use in a given application.
MODERN ELECTRONICS [2] Nov 1987 (v.4#11) pg. 24
Correction MODERN ELECTRONICS [2] Feb 1988 (v.5#2) pg. 7
Correction MODERN ELECTRONICS [2] Mar 1988 (v.5#3) pg. 59

The state of op-amps. What designers have devised to improve the ubiquitous operational amplifier.
MODERN ELECTRONICS [2] Dec 1987 (v.4#12) pg. 34

Experimenting with audio circuits. Using op-amps to build a variety of professional audio circuits to suit different requirements.
MODERN ELECTRONICS [2] Mar 1988 (v.5#3) pg. 34

New developments in op amps. Includes circuits for an instrumentation amplifier, thermocouple thermometer, temperature-compensated crystal-oscillator, and a 9-volt to 5-volt converter.
MODERN ELECTRONICS [2] Sep 1988 (v.5#9) pg. 72

Linear CMOS micropower IC op amps and comparators. Includes circuits for a microphone preamp, function generator, and window comparators.
MODERN ELECTRONICS [2] Dec 1988 (v.5#12) pg. 58

JFET-input operational amplifiers. An introduction to their operation and applications.
MODERN ELECTRONICS [2] Apr 1990 (v.7#4) pg. 68

The operational amplifier (op amp). What it is and how it works. Part 1.
POPULAR ELECTRONICS [1] Aug 1971 (v.35#2) pg. 30

The operational amplifier (op amp). What it is and how it works. Part 2. Basic applications for this versatile IC device.
POPULAR ELECTRONICS [1] Sep 1971 (v.35#3) pg. 61

Use an operational amplifier integrated circuit as a highly sensitive voltage comparator in place of a standard Wheatstone bridge circuit.
POPULAR ELECTRONICS [1] Nov 1971 (v.35#5) pg. 62

Three flip-flop acting circuits are actually multivibrator circuits using IC op amps.
POPULAR ELECTRONICS [1] Jul 1972 (v.2#1) pg. 58

Build an op-amp tester. Tests gain, stability, input offset and bias current. Est. cost: $30.
POPULAR ELECTRONICS [1] Dec 1973 (v.4#6) pg. 34

Upgrade the 741 operational amplifier to become 20-volt power supply, battery charger or eliminator, general AC or DC amplifier, hi-fi audio amplifier, servo amplifier, chart recorder drive, etc.
POPULAR ELECTRONICS [1] Feb 1974 (v.5#2) pg. 62

Breadboard unit for experimenting with op amp circuits. Unit features built-in power supplies, function generator and null detecter. Est. cost: $90.
POPULAR ELECTRONICS [1] Mar 1974 (v.5#3) pg. 59

Circuit to deliver up to 100-mA to an op amp.
POPULAR ELECTRONICS [1] Aug 1974 (v.6#2) pg. 98

Getting started with op-amps. A solderless socket, a handful of parts and you are ready to experiment with these devices. Testing op-amps, LED experiments and a microphone amplifier experiment.
POPULAR ELECTRONICS [1] Jun 1975 (v.7#6) pg. 46

Applications for quad op-amps. A new chip consists of four operational amplifiers in the same package. Typical uses discussed.
POPULAR ELECTRONICS [1] Dec 1975 (v.8#6) pg. 105

Operational amplifiers. How they work, what is available and typical circuits.
POPULAR ELECTRONICS [1] Mar 1976 (v.9#3) pg. 80

Understanding active filters. Using op-amps makes filter design easy and low cost. How to design high-pass, low-pass or band-pass frequency selective filters.
POPULAR ELECTRONICS [1] Dec 1976 (v.10#6) pg. 69

New, practical op-amp circuits. (1) Printed circuit board tester can determine the presence of current flow and the approximate amount of current without breaking the foil trace. (2) Photo switch that can be activated by a flashlight.
POPULAR ELECTRONICS [1] Feb 1977 (v.11#2) pg. 47

Programmable-gain amplifiers. Circuits use an operational amplifier to control gain with a series of switches or under microprocessor or computer control.
POPULAR ELECTRONICS [1] Mar 1981 (v.19#3) pg. 93

Power supplies for operational amplifiers. Seven schematics shown.
POPULAR ELECTRONICS [1] Apr 1981 (v.19#4) pg. 57
Correction POPULAR ELECTRONICS [1] Jun 1981 (v.19#6) pg. 6

Comparison between the newer precision or high-performance op amps and the inexpensive "jellybean" op amps.
POPULAR ELECTRONICS [1] Jun 1981 (v.19#6) pg. 78

Fundamentals of operational amplifiers explained.
POPULAR ELECTRONICS [1] Feb 1982 (v.20#2) pg. 90

Taming the wild op-amp. Causes and cures of spurious and unexpected oscillations in circuits using operational amplifiers and other linear IC's.
POPULAR ELECTRONICS [2] Feb 1989 (v.6#2) pg. 71

Digital electronics course. A close look at comparisons. Fundamental course in design and operation of comparators (a special op-amp used to compare the voltage levels presented to its two inputs).
POPULAR ELECTRONICS [2] Feb 1990 (v.7#2) pg. 69

Fun with op-amps. Part 1. (1) Operation. (2) Non-inverting amplifier circuit. (3) Circuit converts infrared-pulses to audio signals. (4) Infrared detector circuit lets you listen to IR hash or view it on a scope.
POPULAR ELECTRONICS [2] Jan 1992 (v.9#1) pg. 22
Correction POPULAR ELECTRONICS [2] Jun 1992 (v.9#6) pg. 70

All about proper input termination for integrated circuits. Looks at CMOS-logic termination, TTL-logic termination, comparator termination, Op-amp termination, analog switches and multiplexers, and transistor and Darlington arrays.
POPULAR ELECTRONICS [2] Feb 1992 (v.9#2) pg. 58

Fun with op-amps. Part 2. (1) Operation and theory. (2) Telephone amplifier circuit for hearing impaired or noisy environment. (3) Audio alarm sounds a buzzer when the noise level gets too high.
POPULAR ELECTRONICS [2] Feb 1992 (v.9#2) pg. 68

Op-amps. A refreshingly different and intuitive approach to explain how op-amps function.
POPULAR ELECTRONICS [2] Dec 1992 (v.9#12) pg. 57

Using the current-difference linear IC amplifier (Norton amplifier) which performs similarly to the op-amp, but is better suited for certain applications.
POPULAR ELECTRONICS [2] Jul 1996 (v.13#7) pg. 49

Op-amp applications. (1) CMOS-interface driver, (2) dual-voltage supply, (3) AC amplifier, (4) adjustable comparator, (5) dual-voltage comparator, (6) four-level voltage detector, and (7) voltage window.
POPULAR ELECTRONICS [2] Oct 1996 (v.13#10) pg. 68

Gain provider circuit incorporates a single-supply and LM741 inverting AC op-amp.
POPULAR ELECTRONICS [2] Mar 1997 (v.14#3) pg. 74

Basic op-amp circuit configurations. (1) Inverting amp. (2) Noninverting amp. (3) Unity gain amp. (4) DC differential amp. (5) Single-supply inverting amp. (6) Microphone amp. (7) Low voltage audio amps. (8) Fixed gain audio amp.
POPULAR ELECTRONICS [2] Oct 1997 (v.14#10) pg. 68

Simple op-amp application circuits. (1) Fixed voltage reference. (2) Light-operated sensor. (3) Alarm sensor. (4) Voltage-level sensor. (5) Peak-voltage detector and hold. (6) DC motor driver and reverser. (7) Simple timer circuit to delay relay operation for up to 30 seconds.
POPULAR ELECTRONICS [2] Nov 1997 (v.14#11) pg. 62

A hands-on approach to op-amp basics. How they work and three projects to further your understanding of this extremely adaptable device. (1) RIAA phono preamp. (2) RF sniffer. (3) Electronic thermometer.
POPULAR ELECTRONICS [2] Feb 1998 (v.15#2) pg. 31
Correction POPULAR ELECTRONICS [2] Apr 1998 (v.15#4) pg. 6
Added Info POPULAR ELECTRONICS [2] Jun 1998 (v.15#6) pg. 6

IC application of the month. The XR-2208 operational multiplier is suited for both analog computation and communications signal processing applications.
RADIO-ELECTRONICS Apr 1978 (v.49#4) pg. 74

Several protection circuits are shown to protect op-amps from voltage and current overloads.
RADIO-ELECTRONICS Nov 1979 (v.50#11) pg. 70

The Harris Semiconductor HA-2400 PRAM four channel operational amplifier. Description and typical application circuits.
RADIO-ELECTRONICS Mar 1980 (v.51#3) pg. 48

Simple circuit uses any common op-amp to form an analog comparator with variable hysteresis between two trip-points (one fixed and one movable).
RADIO-ELECTRONICS Jul 1981 (v.52#7) pg. 60

How to design your own op-amp circuits.
RADIO-ELECTRONICS Mar 1982 (v.53#3) pg. 54

How to design analog circuits. The operational amplifier.
RADIO-ELECTRONICS Jan 1983 (v.54#1) pg. 63

How to use transconductance operational amplifiers.
RADIO-ELECTRONICS Jul 1983 (v.54#7) pg. 55
Correction RADIO-ELECTRONICS Sep 1983 (v.54#9) pg. 22

Designing with linear IC's. Part 1. Basic op-amp, the CDA linear amp and OTA linear amp.
RADIO-ELECTRONICS Apr 1984 (v.55#4) pg. 89

Designing with linear IC's. Part 2. Basic inverting follower, and how to solve some of the basic problems found in op-amp circuits.
RADIO-ELECTRONICS May 1984 (v.55#5) pg. 80
Added Info RADIO-ELECTRONICS Oct 1984 (v.55#10) pg. 24

Designing with linear IC's. Part 3. Noninverting follower and some op-amp applications.
RADIO-ELECTRONICS Jul 1984 (v.55#7) pg. 54
Correction RADIO-ELECTRONICS Dec 1984 (v.55#12) pg. 25
Correction RADIO-ELECTRONICS Jan 1985 (v.56#1) pg. 24, 26
Added Info RADIO-ELECTRONICS Apr 1985 (v.56#4) pg. 20

Designing with linear IC's. Part 4. Differential and instrumentation amplifiers and how to use them.
RADIO-ELECTRONICS Aug 1984 (v.55#8) pg. 66

Designing with linear IC's. Part 5. Current-difference amplifiers (CDA's) and operational transconductance amplifiers (OTA's).
RADIO-ELECTRONICS Sep 1984 (v.55#9) pg. 77

Computerized op-amp calculator. Find all the circuit values for three important op-amp configurations with this spreadsheet template.
RADIO-ELECTRONICS Oct 1984 (v.55#10) pg. 11 (ComputerDigest)

Designing with linear IC's. Part 6. The logarithmic and isolation amplifiers.
RADIO-ELECTRONICS Nov 1984 (v.55#11) pg. 73

Designing with linear IC's. Part 7. Voltage-controlled amplifiers, integrators, and differentiators.
RADIO-ELECTRONICS Dec 1984 (v.55#12) pg. 73

Power op-amp IC's. Includes a position control for motor-driven, retractable automobile headlights.
RADIO-ELECTRONICS Dec 1984 (v.55#12) pg. 84

Designing with linear IC's. Part 8. A look at op-amp based sinewave, squarewave, and triangular wave generators.
RADIO-ELECTRONICS Jan 1985 (v.56#1) pg. 67

Servicing op-amp circuits in newer television sets.
RADIO-ELECTRONICS Mar 1985 (v.56#3) pg. 106

Precision op-amps. What is available and tips on their uses.
RADIO-ELECTRONICS Oct 1985 (v.56#10) pg. 110

Circuit for a low-current ammeter uses the new OP-41 op-amp from Precision Monolithics Inc.
RADIO-ELECTRONICS May 1986 (v.57#5) pg. 89

Chopper-stabilized op-amps. What is available and tips on their use.
RADIO-ELECTRONICS Aug 1986 (v.57#8) pg. 79

Instrumentation amplifiers. A look at the AD625 high-performance, high-gain op-amp used in applications that require precise, low-level signal amplification.
RADIO-ELECTRONICS Jun 1987 (v.58#6) pg. 87

Testing semiconductors. Part 6. Op-amp characteristics and how to measure them.
RADIO-ELECTRONICS Sep 1987 (v.58#9) pg. 61

Precision Monolithics' OP-90 micropower op-amp is reviewed.
RADIO-ELECTRONICS Sep 1987 (v.58#9) pg. 94

Testing semiconductors. Part 7. AC characteristics of the op-amp.
RADIO-ELECTRONICS Nov 1987 (v.58#11) pg. 115

Working with OTA's (operational transconductance amplifiers), a special type of operational amplifier. Part 1.
RADIO-ELECTRONICS May 1988 (v.59#5) pg. 63

Working with OTA's (operational transconductance amplifiers), a special type of operational amplifier. Part 2.
RADIO-ELECTRONICS Jul 1988 (v.59#7) pg. 61

Working with a Norton op-amp. Exploring the mysteries of the LM3900 current-differencing amplifier.
RADIO-ELECTRONICS Dec 1988 (v.59#12) pg. 69

Compound op-amps. Standard op-amp circuits can easily be modified for applications requiring very high slew rates, high output currents, or output swings up to hundreds of volts. Includes voltage followers, inverting amplifiers, relaxation oscillators, 2-wire detectors, etc.
RADIO-ELECTRONICS Jan 1989 (v.60#1) pg. 69

Basic op-amp principles and circuits.
RADIO-ELECTRONICS Mar 1989 (v.60#3) pg. 69

Working with op-amps. Circuits included for both inverting and non-inverting amplifiers (both AC and DC), voltage followers, audio mixer, adders and subtractors, phase-splitter, and active filters.
RADIO-ELECTRONICS May 1989 (v.60#5) pg. 54

Circuit for a basic analog log amp built around a single op-amp. Called a "transdiode" circuit. Used to convert a linear-voltage input into a log-arithmic output to drive a meter.
RADIO-ELECTRONICS Jul 1989 (v.60#7) pg. 10

Op-amp oscillators. Circuits for sine-wave, Wein-bridge, twin-T, square-wave, and several other oscillators.
RADIO-ELECTRONICS Jul 1989 (v.60#7) pg. 51

Op-amps show their versatility in instrumentation circuits. Includes circuits for rectifier, peak detector, AC/DC converter, voltmeter, ammeter, ohmmeter, voltage reference, and power supply.
RADIO-ELECTRONICS Sep 1989 (v.60#9) pg. 59

Programmable gain amplifier op-amp circuit gives you a choice of +1 or -1 gain. Can be used for synchronous demodulation.
RADIO-ELECTRONICS Mar 1990 (v.61#3) pg. 58

Simple circuit can provide you with a negative voltage from a 9-volt battery for operating op-amps that require a split supply.
RADIO-ELECTRONICS Nov 1990 (v.61#11) pg. 14

How to construct a differential operational amplifier. Article includes diagrams for (1) power amplifier circuit, (2) a low-frequency oscillator circuit, (3) a tuning fork circuit, (4) a circuit for maintaining constant temperature, (5) a circuit for amplifying zener voltage, (6) a constant-current circuit and (7) a circuit for measuring high potential.
SCIENTIFIC AMERICAN Jan 1971 (v.224#1) pg. 110