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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.

xx   TIMER

Programmable timer for a UV exposure lamp (sunlamp) can be set for any time from 10 to 990 seconds. May be used with other 115VAC devices.
AUDIO AMATEUR 4/1987 [Nov 1987] (v.18#4) pg. 44
Correction AUDIO AMATEUR 1/1988 [Feb 1988] (v.19#1) pg. 48

Build the RTC-4 real-time controller, a unit suitable for switching low-current external devices on and off according to immediate commands or stored time-lapse event settings. Est. cost: $90.
BYTE Jul 1983 (v.8#7) pg. 26

Circuits for turning power on (or off) after a specified period of delay.
COMPUTERS & ELECTRONICS Jun 1983 (v.21#6) pg. 90

Adding an output interface to an electronic clock module to control external devices such as radios and lights.
COMPUTERS & ELECTRONICS Oct 1983 (v.21#10) pg. 104

Rediscovering the transistor. Includes circuits for a mositure detector, metronome, electrometer, and power timers.
COMPUTERS & ELECTRONICS Jan 1984 (v.22#1) pg. 96

How to add an SCR interface to an inexpensive digital timer. Then it can be used to control external line-powered devices.
COMPUTERS & ELECTRONICS Jan 1984 (v.22#1) pg. 102

Timer will turn on a radio for up to half an hour and it will kill commercials for up to 1-minute at the touch of a button. Est. cost: $10.
CQ. THE RADIO AMATEUR'S JOURNAL Jan 1979 (v.35#1) pg. 102

Circuit for a TV turnoff which will beep about a half-minute before the electrical circuit is turned off. Unit features a built-in delay of 30 to 60 minutes. The warning beep will allow you to reset the timer.
CQ. THE RADIO AMATEUR'S JOURNAL Apr 1979 (v.35#4) pg. 103

Automatic porch-light control turns itself off after 2 minutes or so (depending upon lamp size and/or ripple counter output).

Clock control for CB and ham station turns them on and off.
ELECTRONICS ILLUSTRATED Sep 1964 (v.7#5) pg. 58

This 555-based timer circuit will supply a 120-volt AC load for up to 5 minutes whenever a button is pressed.
ELECTRONICS NOW Jan 1997 (v.68#1) pg. 12

A 555 timer circuit that closes a relay for two minutes whenever a pushbutton is pressed.
ELECTRONICS NOW May 1998 (v.69#5) pg. 8

Wide-range electronic timer. A junction field-effect transistor device can provide timed output periods from one second to over 5 minutes. Suitable for battery operation of timer. Timer activates a relay for switching operations.
ELECTRONICS WORLD Nov 1967 (v.78#5) pg. 56

Timing circuit, using silicon controlled rectifier, capable of time delaying an output switching function, such as turning off the lights, from 0.1 seconds to 1 minute.
ELEMENTARY ELECTRONICS #763 Winter 1965 pg. 19

Simple two-transistor time delay circuit sensitive enough to be used in a burglar alarm, door opener, baby monitor, etc. Est. cost: $10.
ELEMENTARY ELECTRONICS Nov-Dec 1966 (v.3#2) pg. 100

A 110-volt, AC light switch has two control switches. One turns lights on or off. The other turns the lights off after a predetermined length of time (30 seconds to 15 minutes).
ELEMENTARY ELECTRONICS May-Jun 1969 (v.8#2) pg. 57

A look at various types of automatic timers that are available and how you can use them to save energy and money.
FAMILY HANDYMAN #172 Apr 1976 (v.26#4) pg. 46

Porch-light timer circuit. Battery-powered relay circuit and doorbell-style switch will turn on your porch light (or some other 117-volt appliance) for a five minute period.
HANDS-ON ELECTRONICS Sep-Oct 1986 (v.3#5) pg. 27

Electronic timer to control small kitchen appliances such as food mixers, blenders, etc. Times up to 60 seconds. Can be used as darkroom timer. Handles up to 1000 watts.
MECHANIX ILLUSTRATED #548 Jan 1974 (v.70) pg. 24

Circuit for a "touch plate" timer which can turn on a radio for up to 30 minutes, after which it turns itself off. The same circuit will turn the sound off for up to 1 minute at the touch of a finger. Use this feature to eliminate commercials. Est. cost: $10.
MODERN ELECTRONICS [1] Feb 1978 (v.1#1) pg. 48

Circuit for a delayed action switch that will keep lights on for a minute or two after you turn off the switch.
MODERN ELECTRONICS [1] Mar 1978 (v.1#2) pg. 6

Circuit built around a 555 IC will turn on a 12-volt motor for 4 minutes then turn it off for 4 minutes.
MODERN ELECTRONICS [1] Sep 1978 (v.1#7) pg. 6

Schematic for a circuit which will allow a 12-volt relay to close a circuit and then shut it off after five minutes. Uses a 555 type IC.
MODERN ELECTRONICS [1] Oct 1978 (v.1#8) pg. 7

Custom timer circuits and modified commercial digital timers. Included are circuits designed to turn a fishing boat bait well aerator on-and-off at regular intervals, an SCR/relay output interface for digital timers, cascaded unit for extra-long time delays, etc.
MODERN ELECTRONICS [2] Nov 1986 (v.3#11) pg. 72

A live-well timer. Controls on/off time to adjust oxygen content in live-well water to keep fishing catch alive. Est. cost: $10.
MODERN ELECTRONICS [2] Jul 1988 (v.5#7) pg. 34

Programmable appliance timer. This device applies AC line power to any electrical appliance for a preprogrammed period of time up to 20 minutes (in intervals of 5 seconds). Use in photographic applications, to control lights, etc.
MODERN ELECTRONICS [2] Feb 1989 (v.6#2) pg. 18
Added Info MODERN ELECTRONICS [2] Jun 1989 (v.6#6) pg. 82

One-button digital timer. Accurately controls the time-on interval for recharging cells and batteries to prevent damage due to overcharging. The timer applies AC line power to a battery charger for a preselected period of time (8-, 10-, or 12-hours).
MODERN ELECTRONICS [2] Oct 1989 (v.6#10) pg. 42

Electronic timer turns an electrical device on or off at any preset interval from one second to ten minutes. Adjusting 3 dials determines time interval. Accurate within 5%.
POPULAR ELECTRONICS [1] Dec 1967 (v.27#6) pg. 45

Circuit for turning a relay on and off at selected intervals up to 5 seconds.
POPULAR ELECTRONICS [1] Jul 1968 (v.29#1) pg. 69

Install a time delay circuit on a table lamp and the lamp will remain lit for a few seconds after it has been turned off.
POPULAR ELECTRONICS [1] Nov 1968 (v.29#5) pg. 79
Correction POPULAR ELECTRONICS [1] Feb 1969 (v.30#2) pg. 111

A precison seconds/minutes interval timer provides accurate on or off timing to 99 seconds or 99 minutes for powering 117-volt equipment.
POPULAR ELECTRONICS [1] Apr 1974 (v.5#4) pg. 47

Solid-state delay timer uses a 555 IC to turn off an electrical device 90 minutes after a button is pushed.
POPULAR ELECTRONICS [1] Jun 1976 (v.9#6) pg. 28

Automatic shutoff controller for hi-fi or TV receivers. The absence of an audio signal turns off the equipment after a certain delay. The delay allows you time to change records or TV channel. Can also be used to turn off any electrical equipment up to 1200 watts at a preset interval of 10 minutes up to 2 hours. Est. cost: $40.
POPULAR ELECTRONICS [1] Apr 1977 (v.11#4) pg. 41

Shut-off timer for battery powered appliances.
POPULAR ELECTRONICS [1] Aug 1977 (v.12#2) pg. 48

Dual-purpose timer circuit can be used to energize or de-energize an external device for a preset, but adjustable, time interval.
POPULAR ELECTRONICS [1] Nov 1977 (v.12#5) pg. 74

Two easy-to-make timer circuits. (1) Uses a 5 transistor IC array. (2) Timer used to switch AC loads.
POPULAR ELECTRONICS [1] Dec 1978 (v.14#6) pg. 81

Build a smart switch. A solid-state wall switch that remembers to turn off the lights when you forget. A pushbutton turns on the lights for only 1 minute. The regular switch turns on lights for longer periods. Est. cost: $17.
POPULAR ELECTRONICS [1] Sep 1979 (v.16#3) pg. 82

Circuit for a programmable countdown timer. Add a relay to the timer in order to make an automatic ignition timer for model rockets. Program delays for up to 10 minutes.
POPULAR ELECTRONICS [1] Nov 1980 (v.18#5) pg. 120

Protect your home with a burglar baffler. Ultrareliable circuitry provides programmable, pseudorandom lighting.
POPULAR ELECTRONICS [1] Jul 1981 (v.19#7) pg. 65
Correction POPULAR ELECTRONICS [1] Nov 1981 (v.19#11) pg. 8

Teach your digital clock to control appliances. A few simple additions turn a standard clock module into a versatile control center.
POPULAR ELECTRONICS [1] May 1982 (v.20#5) pg. 73

An ultra-simple VMOS timer circuit will turn off battery power to a radio or other device after a predetermined amount of time.
POPULAR ELECTRONICS [1] Jun 1982 (v.20#6) pg. 92

Simple timer circuit is designed to shut down any 9-volt device that is connected to it after a pre-set interval.
POPULAR ELECTRONICS [2] Mar 1989 (v.6#3) pg. 26

Automatic-shutoff switch for battery-powered projects. Delays from 1 minute to 1 hour are possible.
POPULAR ELECTRONICS [2] May 1989 (v.6#5) pg. 25

Power timer circuit turns a lamp on for a pre-set amount of time after a switch is pushed. Use to time chess moves, delay porch light, etc.
POPULAR ELECTRONICS [2] Jul 1989 (v.6#7) pg. 22

Timer circuit to shut off a tape player after a preset interval. Useful to save batteries.
POPULAR ELECTRONICS [2] Nov 1989 (v.6#11) pg. 28

Universal timer circuit can be configured for make/break operation. It will shut off any circuit after a certain delay.
POPULAR ELECTRONICS [2] Jun 1990 (v.7#6) pg. 24

Battery saver circuit will automatically turn off a small piece of test equipment after a desired period of time.
POPULAR ELECTRONICS [2] Nov 1991 (v.8#11) pg. 20

Timer circuit features a turn-on and turn-off delay. Can be adapted to either DC or AC applications.
POPULAR ELECTRONICS [2] Dec 1991 (v.8#12) pg. 22

Automatic porch-light control. Modify a light switch so that it stays on only until a 4020 divider IC has counted a preset number of 60-Hz powerline pulses.
POPULAR ELECTRONICS [2] Mar 1992 (v.9#3) pg. 46

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

Timer-controlled turn-off delay circuit for a tape deck/amplifier arrangement which eliminates audio thump.
POPULAR ELECTRONICS [2] Apr 1993 (v.10#4) pg. 73
Correction POPULAR ELECTRONICS [2] May 1994 (v.11#5) pg. 89, 28

A collection of display circuits (continued). (1) Monostable 555-timer circuit that alternately flashes a red and a green LED. (2) LED flasher uses a single 1.5-volt source. (3) Count-down switch will turn a 110-volt lamp off after a predetermined time. (4) 10-LED VU meter is adapted to measure the relative sound level in a room.
POPULAR ELECTRONICS [2] Feb 1994 (v.11#2) pg. 24

Turn your alarm clock into a specialized timer to turn on appliances, lights, etc.
POPULAR ELECTRONICS [2] Sep 1994 (v.11#9) pg. 26

Extra-long turn-on delay (one or two weeks) for an electrical device can be achieved by combining this video-signal detector circuit with almost any VCR.
POPULAR ELECTRONICS [2] Dec 1994 (v.11#12) pg. 30

Electronic control circuits. (1) Two-function controller operates a motor when started and engergizes a relay, solenoid, etc. when stopped. (2) Four-output timer can be used to operate motors, air valves, relays, etc. (3) Ten-step counter which can be configured to produce longer timing periods.
POPULAR ELECTRONICS [2] Mar 1995 (v.12#3) pg. 70

Build the time-off, a simple switch that can be programmed to turn off any electrical appliance after an interval of time (ranging from one second to over an hour and a half).
POPULAR ELECTRONICS [2] Sep 1997 (v.14#9) pg. 33

Switch circuit to activate an outdoor light or other device and keep it turned on for a short period of time (up to 3 minutes).
POPULAR ELECTRONICS [2] Mar 1998 (v.15#3) pg. 28

Remote-controlled courtesy-lamp timer. A key chain RF remote-control transmitter is used to turn an interior lamp or porch light on or off. A built-in timer can turn the lamp off after a preset amount of time.
POPULAR ELECTRONICS [2] Jun 1999 (v.16#6) pg. 35
Correction POPULAR ELECTRONICS [2] Aug 1999 (v.16#8) pg. 17

Electric clock timer for $10.
POPULAR MECHANICS Aug 1963 (v.120#2) pg. 176

An easy way to automate your home. What clock timers can do to improve your life.
POPULAR MECHANICS Sep 1971 (v.136#3) pg. 112

Use several inexpensive plug-in timers to turn electric lamps on and off at irregular intervals when you are not at home.
POPULAR MECHANICS May 1976 (v.145#5) pg. 108

How to build your own digital alarm clock with a snooze alarm, AM, PM and power indicators and an extra circuit to start a coffee pot.
POPULAR SCIENCE Nov 1977 (v.211#5) pg. 123

Ten-function digital clock. Part 1. Simultaneous readout of time, date, alarm and countdown timer. Timer has three modes of operation to turn on or off appliances and the time can be 12- or 24-hour format. Est. cost: $109.
RADIO-ELECTRONICS Aug 1977 (v.48#8) pg. 36

Ten-function digital clock. Part 2.
RADIO-ELECTRONICS Sep 1977 (v.48#9) pg. 40
Correction RADIO-ELECTRONICS Nov 1977 (v.48#11) pg. 16

Swimming pool pump timer circuit lets you run your pump for 15, 30, or 45 minutes out of every hour rather than continuously.
RADIO-ELECTRONICS Aug 1981 (v.52#8) pg. 72

Use a clock radio as an appliance controller. Modify a clock radio to turn on 110-volt appliances.
RADIO-ELECTRONICS Mar 1983 (v.54#3) pg. 78

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

Time-delay circuit that can be adjusted for up to 5 minutes. Incorporates the 555 timer IC and a relay.
RADIO-ELECTRONICS Oct 1986 (v.57#10) pg. 16

Build this versatile digital timer to turn a device off and on several times a day. Can control any device that draws as much a 6 amps of power. Est. cost: $60.
RADIO-ELECTRONICS Aug 1987 (v.58#8) pg. 45, 75

High-intensity lamp with a built-in clock and appliance timer.
WORKBENCH Nov-Dec 1968 (v.24#6) pg. 22

How to use adjustable timers to reduce your electric consumption. Use them to turn on and off such things as hot water heaters, air conditioners, heaters, etc.
WORKBENCH Sep-Oct 1982 (v.38#5) pg. 106