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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.

TIMER -- ELECTRONIC
sa   COMPUTER CLOCKING & TIMING
xx   TIMER

Computer-based laboratory timer. The Heath ET-3400 microcomputer trainer is wired for use as a two-channel, data-logging, millisecond timer.
BYTE Jun 1981 (v.6#6) pg. 110

Audible timer circuit can be set for any period of minutes (from 1 to 7) using a rotary switch. An LED also indicates the status of the timer. Suitable for darkroom use and for blind or deaf persons.
ELECTRONICS EXPERIMENTERS HANDBOOK 1996 pg. 74

The 555. A versatile monolithic timer/oscillator integrated circuit. Part 1. Learn to use the 555 and 556 timer IC in practical circuits to obtain accurate time delays and square waves.
ELECTRONICS NOW Sep 1992 (v.63#9) pg. 58

The 555. A versatile monolithic timer/oscillator integrated circuit. Part 2. Self-triggering oscillator circuits. Build circuits that generate a variety of square or rectangular waveforms, wail like sirens, etc.
ELECTRONICS NOW Oct 1992 (v.63#10) pg. 69
Added Info ELECTRONICS NOW Feb 1993 (v.64#2) pg. 16

The 555. A versatile monolithic timer/oscillator integrated circuit. Part 3. Using in a Schmitt trigger, or as the heart of light and temperature alarms and drivers, a metronome, and a continuity tester.
ELECTRONICS NOW Nov 1992 (v.63#11) pg. 61

The 555. A versatile monolithic timer/oscillator integrated circuit. Part 4. Sawtooth generator, ramp generator, time-base generator, frequency meter, tachometer for a car, etc.
ELECTRONICS NOW Dec 1992 (v.63#12) pg. 62

Simple, variable, time delay circuit uses a 555 timer IC.
ELECTRONICS NOW Aug 1993 (v.64#8) pg. 12

How to configure a 555 timer IC circuit to sound a buzzer after a two-minute delay. Delay period can be altered.
ELECTRONICS NOW Nov 1997 (v.68#11) pg. 8

Printing Stopwatch program for a Radio Shack Model 100 produces a printed time log for jobs which are billed at an hourly rate.
HANDS-ON ELECTRONICS Sep 1987 (v.4#9) pg. 48

Surefire timer programs. These Z-80 and 8080 multiple interval timer programs provide exact delays and eliminate guesswork.
KILOBAUD MICROCOMPUTING #59 Nov 1981 (v.5#11) pg. 62

How to use "timing flags" in computer programs. A timing flag is a single variable used in place of several separate variables that count cycles and sequences of events.
MICROCOMPUTING #88 Apr 1984 (v.8#4) pg. 96

Programmable digital sequencers and controllers. Use them to activate LEDs, motors, solenoids, etc. Part 1. Construction of a 16-step, 4-bit programmable digital sequencer is shown which uses a "punched card" and simple card reader to enter the programs.
MODERN ELECTRONICS [2] May 1988 (v.5#5) pg. 62

Programmable digital sequencers and controllers. Part 2. Construction of a 256-step, programmable digital sequencer is shown.
MODERN ELECTRONICS [2] Jun 1988 (v.5#6) pg. 70

Interfacing 555 timers. A hands-on look at real-world use of this ubiquitous and very versatile IC timer chip.
MODERN ELECTRONICS [2] May 1990 (v.7#5) pg. 52

Unique "time's up" game timer electronically automates the timing required for many games. Timing cycle can be set in 1-second increments from 1 second to 4 minutes and 15 seconds.
MODERN ELECTRONICS [2] Dec 1990 (v.7#12) pg. 40

Experimenting with surplus goodies. Ideas for elapsed-time indicators, electroluminescent panels, 60-Hz oscillator module, and chart recorder.
MODERN ELECTRONICS [2] Dec 1990 (v.7#12) pg. 48

Simple relay circuit can be activated by a TRS-80 computer and a BASIC program, resulting in a programmable timer to turn electrical devices on after a specified delay.
POPULAR ELECTRONICS [1] Jan 1980 (v.17#1) pg. 58

Use your TRS-80 computer as a timer or alarm clock. Program computer to time an event lasting up to 24 hours or to sound an alarm at any desired time.
POPULAR ELECTRONICS [1] Oct 1980 (v.18#4) pg. 72
Correction POPULAR ELECTRONICS [1] Feb 1981 (v.19#2) pg. 7

Time-out circuit uses a 555 timer configured in the astable mode as opposed to the monostable, or one-shot mode.
POPULAR ELECTRONICS [2] Jan 1991 (v.8#1) pg. 80

Supercharging a 555 timer IC. Exploring the built-in voltage-controlled oscillator function.
POPULAR ELECTRONICS [2] Oct 1991 (v.8#10) pg. 22

Test fixture for 555 oscillator timer ICs will quickly show which ones are good, beginning to fail, or have gone bad.
POPULAR ELECTRONICS [2] Oct 1991 (v.8#10) pg. 23

Tele-timer circuit. A buzzer sounds after a preset time interval, either 3 seconds or 1-to-10 minutes.
POPULAR ELECTRONICS [2] May 1992 (v.9#5) pg. 75

The 558 quad monostable timer. An introduction to this improved version of the venerable 555 and 556 oscillator/timer ICs. Part 1.
POPULAR ELECTRONICS [2] Sep 1992 (v.9#9) pg. 73

The 558 quad monostable timer. Part 2.
POPULAR ELECTRONICS [2] Oct 1992 (v.9#10) pg. 72

The 558 quad monostable timer. Part 3.
POPULAR ELECTRONICS [2] Nov 1992 (v.9#11) pg. 75

Motorola MC14538 dual, precision, retriggerable monostable multivibrator applications. (1) Extended on-time timer circuit. (2) No-doze alarm circuit requires pressing reset button every 50 seconds. (3) Self-retriggering timed-on generator circuit. (4) Lamp-switching circuit to provide a delay turn-off function.
POPULAR ELECTRONICS [2] Dec 1992 (v.9#12) pg. 68

Unijunction transistor (UJT) circuits. (1) Relaxation oscillators. (2) Constant-current relaxation oscillator. (3) Improved-linearity relaxation oscillator. (4) 1- to 30-second time-delay. (5) RF snooper.
POPULAR ELECTRONICS [2] Jan 1993 (v.10#1) pg. 70

How to use the popular 555 timer IC in practical monostable multivibrator circuits. (1) Fixed-period timer. (2) Relay drivers. (3) Pulse generator. (4) 1-kHz linear-scale analog frequency meter.
POPULAR ELECTRONICS [2] Mar 1993 (v.10#3) pg. 53

A mixed collection of practical 555-timer IC application circuits. (1) Schmitt-trigger converts sinewaves into squarewaves. (2) Dark-activated relay switch can control lighting. (3) Code-practice oscillator. (4) Electronic door buzzer. (5) LED flasher. (6) Long-period timers.
POPULAR ELECTRONICS [2] Jun 1993 (v.10#6) pg. 62

Timing is everything. A collection of timer circuits. (1) Simple 555 timer. (2) Dual timer uses a 556 IC. (3) CMOS cascade timer uses two 4528 ICs. (4) Cheapie timer uses 4050 hex noninverting buffer IC. (5) Expanded timer uses three buffer stages with 4050 ICs.
POPULAR ELECTRONICS [2] Sep 1996 (v.13#9) pg. 57

Build the millennium clock. This electronic calendar will keep track of how many days until a certain event happens.
POPULAR ELECTRONICS [2] Nov 1998 (v.15#11) pg. 31
Correction POPULAR ELECTRONICS [2] Jan 1999 (v.16#1) pg. 4

The 8253 programmable interface timer IC. Part 1. A demonstration program for the Intel 8253 programmable interval timer. This program is used in connection with an 8080 computer to illustrate the various modes of operation of the timer.
RADIO-ELECTRONICS Aug 1978 (v.49#8) pg. 64

The 8253 programmable interface timer IC. Part 2. Characteristics of the timer.
RADIO-ELECTRONICS Sep 1978 (v.49#9) pg. 74

How to design microprocessor-based projects. Part 2. The language of the 8073 microinterpreter (National Semiconductor's Tiny BASIC). Includes an application circuit called "burglar outwitter" to control three lights in a sequential fashion to simulate the movement of a person during the evening hours.
RADIO-ELECTRONICS May 1985 (v.56#5) pg. 81

Panel-mounted timer will turn on a red LED to remind you to change fuel tanks. The circuit shown lets you select a 30-minute or 60-minute interval.
SPORT AVIATION Nov 1992 (v.41#11) pg. 100