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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
Click on a see also (sa) or tracing (xx) to view detailed entries about a related subject.
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.


De-ringing transformers in your audio system. A simple way to make moving coil transformers behave.
AUDIO AMATEUR 3/1981 [Jun 1981] (v.12#3) pg. 22
Added Info AUDIO AMATEUR 1/1982 [Jan 1982] (v.13#1) pg. 53, 57
Added Info AUDIO AMATEUR 2/1982 [May 1982] (v.13#2) pg. 55
Added Info AUDIO AMATEUR 4/1982 [Oct 1982] (v.13#4) pg. 55
Added Info AUDIO AMATEUR 2/1983 [Jun 1983] (v.14#2) pg. 58

Tuning power transformers used in audio equipment by fitting a capacitor across the output terminals.
AUDIO AMATEUR 2/1994 [Jun 1994] (v.25#2) pg. 27
Correction AUDIO AMATEUR 1/1995 [Jan 1995] (v.26#1) pg. 50

Power supply design software. BASIC language computer programs for (1) determining the transformer specifications to meet your DC voltage and current requirements and (2) calculating the DC output voltage and current of a specified transformer when operating a given load.
AUDIO AMATEUR 1/1995 [Jan 1995] (v.26#1) pg. 26
Correction AUDIO AMATEUR 3/1995 [Aug 1995] (v.26#3) pg. 46

Tip on using brass automotive engine-block freeze plugs to "mechanically ground" the power transformer inside an audio amplifier.
AUDIO ELECTRONICS 1/1997 [Feb 1997] (v.28#1) pg. 40

Power transformers for audio equipment. An overview of the different types and why you might choose to use each type in audio equipment.
AUDIOXPRESS Jun 2001 (v.32#6) pg. 14
Added Info AUDIOXPRESS Sep 2001 (v.32#9) pg. 77
Added Info AUDIOXPRESS Oct 2001 (v.32#10) pg. 82

Audio uses of transformers.
AUDIOXPRESS May 2003 (v.34#5) pg. 50

The transmission-line transformer. A simplified explanation of how they work.
CQ. THE RADIO AMATEUR'S JOURNAL Jul 1980 (v.36#7) pg. 18

How to build your own isolation transformers.
CQ. THE RADIO AMATEUR'S JOURNAL Feb 1987 (v.43#2) pg. 40

Some thoughts on broadband transformers. Includes general steps required to make your own broadband RF transformers that will minimize the loss in transformer-coupled circuits.
CQ. THE RADIO AMATEUR'S JOURNAL Sep 1993 (v.49#9) pg. 110

Some practical aspects of toroids. How to wind and use toroidal and balun-core inductors and transformers.
CQ. THE RADIO AMATEUR'S JOURNAL Oct 1996 (v.52#10) pg. 46

Home-brew isolation transformer will protect you and your test equipment while you service and repair electronic appliances. This device isolates the chassis of equipment being serviced from the AC line. Cost savings come from modifying transformers taken from discarded microwave ovens. Est. cost: $25.

How to drop a battery voltage.
ELECTRONICS ILLUSTRATED Mar 1963 (v.6#2) pg. 110

Explanation of audio transformer.
ELECTRONICS ILLUSTRATED May 1963 (v.6#3) pg. 78

Simple transformer wound on a large carriage bolt.
ELECTRONICS ILLUSTRATED Mar 1965 (v.8#2) pg. 90

Servicing and identification shortcuts that will help identify unmarked transformers.
ELECTRONICS ILLUSTRATED Jul 1968 (v.11#4) pg. 56

Easy way to test transformers, coils, chokes, motors, ... (almost any device containing a winding).
ELECTRONICS NOW Nov 1994 (v.65#11) pg. 54
Added Info ELECTRONICS NOW Jan 1995 (v.66#1) pg. 10 (2 letters)

Build an isolation transformer to protect yourself and your equipment when you service electronics.
ELECTRONICS NOW Jan 1995 (v.66#1) pg. 63
Added Info ELECTRONICS NOW Apr 1995 (v.66#4) pg. 17

Tips on replacing a burned-out transformer when you don't know the voltage values.
ELECTRONICS NOW Mar 1996 (v.67#3) pg. 49

Simple set up to perform a ringing test on a coil (inductor) or transformer of any type using a square wave generator and an oscilloscope.
ELECTRONICS NOW Jan 1998 (v.69#1) pg. 12

Transformers, their theory and uses.
ELEMENTARY ELECTRONICS Sep-Oct 1969 (v.9#1) pg. 69

New basic course in electricity and electronics. Transforming AC. How a transformer works.
ELEMENTARY ELECTRONICS Nov-Dec 1974 (v.14#6) pg. 85

Custom build transformers by rewinding common voltage units to produce the needed output. Instructions and formulas for unwinding and rewinding.
ELEMENTARY ELECTRONICS May-Jun 1976 (v.16#3) pg. 65

Basic course in electricity and electronics. Understanding transformers.
ELEMENTARY ELECTRONICS Jan-Feb 1979 (v.19#1) pg. 79

How to build your own isolation transformer to avoid shock hazards when working on old radios where one side of the power line is attached to the chassis.
ELEMENTARY ELECTRONICS Sep-Oct 1980 (v.20#5) pg. 72

Basic circuits for using variable voltage transformers to do troubleshooting of old time radios.
ELEMENTARY ELECTRONICS Nov-Dec 1980 (v.20#6) pg. 68

How to rewind antique radio transformers.
ELEMENTARY ELECTRONICS Jan-Feb 1981 (v.21#1) pg. 67

Transformer hunting. How to check a used transformer with a continuity meter before purchasing. Tips on determining the characteristics of an unknown transformer.
GLASS AUDIO 2/1989 (v.1#2) pg. 24

List of audio output transformers and audio interstage transformers currently in production along with their costs and specifications.
GLASS AUDIO 2/1990 (v.2#2) pg. 44

How audio transformers work. Aspects pertaining to primary and leakage inductance, winding capacitance and how they react with tube impedances and other circuit elements are discussed.
GLASS AUDIO 1/1992 (v.4#1) pg. 12

Electrical adjustment in fitting a new output transformer to an audio amplifier.
GLASS AUDIO 2/1992 (v.4#2) pg. 19

Output transformers. A simple explanation of the matching process and of all the factors that control the frequency response and the distortion introduced by an output transformer between a loudspeaker of low impedance and the output vacuum tubes in an audio amplifier. Part 1.
GLASS AUDIO 2/1994 (v.6#2) pg. 24

Output transformers. Part 2.
GLASS AUDIO 3/1994 (v.6#3) pg. 30

Quick, simple output tests for transformers being used in vacuum tube audio amplifiers.
GLASS AUDIO 1/1995 (v.7#1) pg. 24
Correction GLASS AUDIO 2/1995 (v.7#2) pg. 54
Added Info GLASS AUDIO 5/1997 (v.9#5) pg. 20

The snubber. An inexpensive circuit to improve the fidelity of common output transformers by damping out oscillations (ringing) found at the beginning of square waves at the speaker terminals.
GLASS AUDIO 3/1995 (v.7#3) pg. 18

Transmission line audio transformers. An overview of techniques and benefits of tandem bifilar-wound TL (transmission line) transformers.
GLASS AUDIO 5/1995 (v.7#5) pg. 1

Measuring output-transformer performance (both low and high frequency) and how it affects tube amplifier quality.
GLASS AUDIO 5/1997 (v.9#5) pg. 20
Correction GLASS AUDIO 6/1997 (v.9#6) pg. 74

Brief overview for laymen about the factors considered in tapping output transformer (OPT) primaries.
GLASS AUDIO 1/1998 (v.10#1) pg. 60

Advice on using less expensive 4k-ohm center-tapped transformers in place of 8k-ohm units in a Sansui stereo receiver/amplifier with 7189A output tubes.
GLASS AUDIO 3/1998 (v.10#3) pg. 46

Operational differences between using an output transformer with 40% U/L taps and one with 21% U/L taps in the same audio amp circuit.
GLASS AUDIO 3/1999 (v.11#3) pg. 64

Build a transformer polarity test box to check polarity before hooking up the transformer.
GLASS AUDIO 6/1999 (v.11#6) pg. 42

Safe transformer sleuthing. This current-limiting circuit combined with a Variac provides a safe way to track down the primary leads to a transformer.
GLASS AUDIO 2/2000 (v.12#2) pg. 69

Method for determining the impedance of tube-type output transformers.
GLASS AUDIO 5/2000 (v.12#5) pg. 56
Added Info AUDIOXPRESS Apr 2001 (v.32#4) pg. 84, 86

Electronic fundamentals. Inductors and transformers.
HANDS-ON ELECTRONICS Jan 1987 (v.4#1) pg. 83

Isolate yourself from electricity and stay alive. Build an isolation transformer to "lift" the AC power line off ground and convert it to a floating-AC power system. This greatly reduces or eliminates the chances of your body forming an electrical path from an AC circuit to the ground.
HANDS-ON ELECTRONICS Dec 1988 (v.5#12) pg. 70

Salvaging an autotransformer (Variac). Modify an older variable transformer (0- to 140-volts AC) to control lamps, test electrical equipment, etc.
HANDS-ON ELECTRONICS Jan 1989 (v.6#1) pg. 69

Transformer theory. A service guide to troubleshooting transformers in electronic gear.
MODERN ELECTRONICS [2] Jan 1989 (v.6#1) pg. 39

Schematic for an autotransformer that can raise or lower AC line voltage by 5 or 10 volts.
POPULAR COMMUNICATIONS Apr 1991 (v.9#8) pg. 51

Isolation transformer circuit features 120-volt amperes with taps spotted at 24 volt intervals. Est. cost: $9.
POPULAR ELECTRONICS [1] Oct 1968 (v.29#4) pg. 27

Tips on making a variable voltage transformer (AC bench supply) more versatile.
POPULAR ELECTRONICS [1] Jan 1969 (v.30#1) pg. 52

Four building-block power supply circuits. Two transformer-rectifier units, a series regulator and a shunt regulator.
POPULAR ELECTRONICS [1] Feb 1969 (v.30#2) pg. 72

Solid-state variable transformer uses a triac. Handles up to 360 watts. Est. cost: $8.
POPULAR ELECTRONICS [1] Oct 1969 (v.31#4) pg. 42

DC transformer accepts 3 to 15 volts DC input and delivers from 80 to 425 volts DC output.
POPULAR ELECTRONICS [1] Mar 1970 (v.32#3) pg. 35

Winding your own non-standard audio output transformers.
POPULAR ELECTRONICS [1] Sep 1970 (v.33#3) pg. 78

Design of transmission-line transformers. How coreless transformers can be made from coaxial transmission line.
POPULAR ELECTRONICS [1] Apr 1979 (v.15#4) pg. 47

How to add a simulated center tap to the secondary of an existing transformer without rewinding it.
POPULAR ELECTRONICS [1] Nov 1980 (v.18#5) pg. 102

Low-cost power supplies from recycled AC adapters. How to check out and utilize AC adapters (transformers) formerly used to power radios, calculators, shavers, etc.
POPULAR ELECTRONICS [1] Feb 1981 (v.19#2) pg. 57

Winding your own adjustable tuning coils. How to make your own slug-tuned variable inductors, RF transformers, and IF transformers.
POPULAR ELECTRONICS [2] Apr 1990 (v.7#4) pg. 92

Boost AC line voltage with this autotransformer made from a plain power-supply transformer.
POPULAR ELECTRONICS [2] Nov 1991 (v.8#11) pg. 18
Added Info POPULAR ELECTRONICS [2] Jul 1992 (v.9#7) pg. 73

Make an isolation transformer to provide power to a device while isolating it from the AC line, thus preventing accidental grounding while performing electrical repairs.
POPULAR ELECTRONICS [2] Nov 1991 (v.8#11) pg. 18
Added Info POPULAR ELECTRONICS [2] Apr 1992 (v.9#4) pg. 70

All about toroidal transformers. Learn about the important advantages toroidal transformers have over other designs, and how to use them.
POPULAR ELECTRONICS [2] May 1996 (v.13#5) pg. 53

A collection of troubleshooting circuits. (1) Voltage testers. (2) Polarity indicator. (3) Continuity tester. (4) Transformer tester. (5) Meter resistance tester. (6) Intermittently-open circuit tester.
POPULAR ELECTRONICS [2] Aug 1997 (v.14#8) pg. 67

Tips on testing an unknown flyback transformer which will be used in a high-voltage power supply.
POPULAR ELECTRONICS [2] Jan 1999 (v.16#1) pg. 4

Transformer features interchangeable secondary writing.
POPULAR MECHANICS Jan 1964 (v.121#1) pg. 188

The right way to wind toroids (toroid transformers) for use as RF chokes.
POPULAR MECHANICS Apr 1984 (v.161#4) pg. 10

How to find a replacement transformer for an electronic device without a schematic. How to determine the DC voltage and current drawn in order to select a replacement that will work in the circuit.
RADIO-ELECTRONICS Jan 1978 (v.49#1) pg. 70

How to determine the voltage and current rating of unmarked transformers.
RADIO-ELECTRONICS Apr 1979 (v.50#4) pg. 70

How to rewind transformers.
RADIO-ELECTRONICS May 1983 (v.54#5) pg. 77
Added Info RADIO-ELECTRONICS Nov 1983 (v.54#11) pg. 22

Tips on identifying leads on a power transformer.
RADIO-ELECTRONICS Jun 1983 (v.54#6) pg. 90

Antique radios. Troubleshooting ancient transformers, tubes and speakers.
RADIO-ELECTRONICS Jan 1988 (v.59#1) pg. 84

Linear voltage differential transformers, a special kind of transducer. How they work and typical applications.
RADIO-ELECTRONICS Mar 1990 (v.61#3) pg. 66