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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.

x   LED
xx   DIODE
xx   LIGHT

How to operate LEDs directly from AC power sources.
CQ. THE RADIO AMATEUR'S JOURNAL Nov 1998 (v.54#11) pg. 46

Connecting a blinking red LED (such as Radio Shack's 276-036) directly to the output of a 7805 (or 78L05) voltage regulator.
ELECTRONICS NOW Jan 1996 (v.67#1) pg. 8

Circuit which uses the LM3914 LED driver to light up to 10 LEDs.
ELECTRONICS NOW Jun 1998 (v.69#6) pg. 6

Extra-low-power pilot light is suitable for use on battery powered devices.
HANDS-ON ELECTRONICS Summer 1984 (v.2#1) pg. 91

SCR tester. Make SCR testing a snap with this simple, easy-to-build, and easy-to-use tester. Use it to test Triacs, LEDs, and diodes too.
HANDS-ON ELECTRONICS Dec 1988 (v.5#12) pg. 60
Added Info POPULAR ELECTRONICS [2] Mar 1989 (v.6#3) pg. 4

Circuit to test the condition of LEDs, diodes, and bipolar transistors (both power transistors as well as low power types).
INDUSTRIAL EDUCATION Nov 1982 (v.71#8) pg. 30

Calculating the dropping resistor values required to operate LEDs.
MODEL RAILROADER Feb 1991 (v.58#2) pg. 105

How to convert a tri-color LED into a bi-color LED.
MODEL RAILROADER Nov 1994 (v.61#11) pg. 120

Experimenting with multi-color LEDs.
MODEL RAILROADER May 1996 (v.63#5) pg. 110

How to get started in electronics. Part 1: Inside semiconductors. Looks at the diode, transistor, SCRs, LEDs, light detectors, etc.
MODERN ELECTRONICS [2] Oct 1984 (v.1#1) pg. 44

Miniature LED pulse transmitter.
MODERN ELECTRONICS [2] Mar 1986 (v.3#3) pg. 62

Surface-mount-device circuits: A design and construction guide. Projects include using SMCs (surface-mountable components) to produce a subminiature LED tone transmitter, A/D converter LED bargraph or metering circuit, and light-sensitive oscillator (probe).
MODERN ELECTRONICS [2] Feb 1987 (v.4#2) pg. 40

Key chain electronic projects rely on the use of surface-mountable components. (1) Light meter with LED bargraph display. (2) Light sensor with a rotating LED ring display. (3) Ultraminiature LED pulse transmitter.
MODERN ELECTRONICS [2] Mar 1987 (v.4#3) pg. 68

Unconventional ultraminiature circuits. Using conductive inks and adhesives to interconnect surface-mountable components. Circuits include: (1) Business card tone generator. (2) Boardless LED tone transmitter. (3) Boardless LED transmitter.
MODERN ELECTRONICS [2] May 1987 (v.4#5) pg. 70

Light-emitting diodes can double as both emitters and detectors of light. Background information on devices that both emit and detect light. Includes several applications (circuits) for LEDs operated as detectors.
MODERN ELECTRONICS [2] Feb 1988 (v.5#2) pg. 62

Experimenting with liquid nitrogen. How solid-state components, LEDs, diodes, transistors, radioactivity, etc. are affected by extreme cold.
MODERN ELECTRONICS [2] Apr 1988 (v.5#4) pg. 62

High-power infrared light-emitting diodes. What they are and typical applications.
MODERN ELECTRONICS [2] Jun 1990 (v.7#6) pg. 56

High-power visible light-emitting diodes. A look at the various red LEDs and typical applications.
MODERN ELECTRONICS [2] Jul 1990 (v.7#7) pg. 50

Light-emitting diodes explained.
POPULAR ELECTRONICS [1] Nov 1970 (v.33#5) pg. 35

Tips on using light emitting diodes (LEDs) to aid the hard of hearing.
POPULAR ELECTRONICS [1] Sep 1972 (v.2#3) pg. 47

How light-emitting diodes work and some tips on where to use them.
POPULAR ELECTRONICS [1] Oct 1974 (v.6#4) pg. 58

Several circuits for experimenting with light-emitting diodes including a continuity tester, polarity alarm, voltage monitors and lamp flashers.
POPULAR ELECTRONICS [1] Oct 1974 (v.6#4) pg. 88

Simple circuit employing two LED's is used to detect when you have "zero-beated" a vfo and a received signal.
POPULAR ELECTRONICS [1] Nov 1975 (v.8#5) pg. 105

Tip on using an LED as a voltage dropper instead of a regular diode.
POPULAR ELECTRONICS [1] Mar 1976 (v.9#3) pg. 83

A look at the new National Semiconductor LED type NSL 4944 which can be used with ac or dc, over a wide range of voltage. It can be the principle active device in a variety of interesting circuits. Typical applications are reviewed.
POPULAR ELECTRONICS [1] May 1976 (v.9#5) pg. 78

Using LED's as light detectors, due to their photosensitive property.
POPULAR ELECTRONICS [1] May 1977 (v.11#5) pg. 86

Tips on mounting LEDs on a panel.
POPULAR ELECTRONICS [1] Apr 1978 (v.13#4) pg. 114

LED phototransistor receiver and transmitter. Part 1. Receiver module. Built into a 16 pin DIP module. Used to detect the signal from an LED transmitter.
POPULAR ELECTRONICS [1] Jan 1979 (v.15#1) pg. 82

LED phototransistor receiver and transmitter. Part 2. Transmitter module. Miniature unit fits inside a 16-pin DIP module.
POPULAR ELECTRONICS [1] Feb 1979 (v.15#2) pg. 82

How to interchange common-cathode LED's for common-anode LED's (and vice versa). Modifications to circuit are shown.
POPULAR ELECTRONICS [1] May 1979 (v.15#5) pg. 82

High-current LED pulser is suitable for an optical source in remote controls, intrusion alarms, sensors, etc. Uses an infrared LED.
POPULAR ELECTRONICS [1] Jul 1979 (v.16#1) pg. 90

Demonstration circuit for the tri-state LED.
POPULAR ELECTRONICS [1] Sep 1979 (v.16#3) pg. 102

An "oddball" or hard-to-find incandescent lamp used in an electronic device can often be replaced by an LED as shown in this circuit.
POPULAR ELECTRONICS [1] Mar 1980 (v.17#3) pg. 90

Basic schematic for a circuit to drive a discrete LED from either a TTL or CMOS logic signal.
POPULAR ELECTRONICS [1] Oct 1980 (v.18#4) pg. 85

Circuit to dim LEDs by varying the duty cycle of the power applied from 50% to 99%.
POPULAR ELECTRONICS [1] Nov 1981 (v.19#11) pg. 80

Digital electronics course. Enlightening you on LED's. How to connect LED's, compute the series resistance, measure important diode characteristics, etc.
POPULAR ELECTRONICS [2] Aug 1989 (v.6#8) pg. 75

Simple power-indicator LED circuit can take the place of neon pilot lamps in AC circuits.
POPULAR ELECTRONICS [2] Mar 1991 (v.8#3) pg. 25

Light sources for electronic projects and instruments. A look at the most common light sources and an in-depth explanation of how LED's are built and operate.
POPULAR ELECTRONICS [2] Mar 1992 (v.9#3) pg. 49

Solid-state light sources. Learning to use LED's. Several typical circuits shown.
POPULAR ELECTRONICS [2] Jun 1992 (v.9#6) pg. 31

True tri-color LED circuit lets the LED change colors from red to yellow to green to off.
POPULAR ELECTRONICS [2] Sep 1995 (v.12#9) pg. 28

Circuits to light up LEDs. (1) Calculating the value needed for the current-limiting resistor required to feed several LEDs in series. (2) Constant-current source. (3) Pilot lamp. (4) Flasher. (5) DC-level indicator.
POPULAR ELECTRONICS [2] Oct 1995 (v.12#10) pg. 76

Simple single-transistor circuits. (1) Voltage regulator outputs 6-volts DC. (2) Constant-current output. (3) Simple audio amplifier. (4) Impedance-matching circuit. (5) LED-control circuits turn either off or on in the presence of a DC voltages from 5- to 9-volts. (6) Relay-driver circuit has a latching feature that keeps the relay on once energized.
POPULAR ELECTRONICS [2] Dec 1995 (v.12#12) pg. 77

Six LED light strings. (1) Simple LED light string operates directly from the AC power line. (2) Bridge-fed string. (3) Dual light string. (4) Dual-color light string. (5) Alternating-color light string. (6) Multi-string light circuit.
POPULAR ELECTRONICS [2] Jan 1996 (v.13#1) pg. 65

Circuit for testing and determining the polarity of LEDs.
POPULAR ELECTRONICS [2] May 1997 (v.14#5) pg. 63

Introduction to the operation and application of LEDs (light-emitting diodes).
POPULAR ELECTRONICS [2] Nov 1998 (v.15#11) pg. 56

Make your own custom hardware. Make LED mounting strips and LED holders. Make PC board edge connectors from J-pins. Make IC terminal sockets from J-pin and Molex soldercon. Make piggyback mount for ICs. Make PC board and ribbon-cable connectors from male & female headers. Make your own plug-in terminal strips for discrete components.
RADIO-ELECTRONICS Apr 1978 (v.49#4) pg. 67

Circuit to turn on an LED when the voltage exceeds a selected level.
RADIO-ELECTRONICS May 1982 (v.53#5) pg. 80

Working with LED's. Beginning an in-depth survey of optoelectronic systems by taking a close look at a wide variety of LED circuits. Part 1. LED basics and practical LED flashers.
RADIO-ELECTRONICS Jan 1992 (v.63#1) pg. 50