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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.


Low-cost alarm system you can build to sound a horn or turn on a light.
BOYS' LIFE Apr 1976 (v.66#4) pg. 68

Circuits for sensors in computer-controlled alarm systems.
BYTE Feb 1981 (v.6#2) pg. 280

Experimenting with a piezoelectric speaker includes a circuit for a portable siren.
COMPUTERS & ELECTRONICS Dec 1983 (v.21#12) pg. 89

Circuit for an electronic "fire engine" alarm. Est. cost: under $10.
CQ. THE RADIO AMATEUR'S JOURNAL Jan 1979 (v.35#1) pg. 99

Refrigerator tone alarm beeps whenever the door is left open for more than 20 seconds. Triggered by refrigerator light.
CQ. THE RADIO AMATEUR'S JOURNAL Nov 1981 (v.37#11) pg. 85

How to control the Heath/Zenith Barking Dog Alarm via an X-10 universal module.
ELECTRONIC HOUSE Mar-Apr 1991 (v.6#2) pg. 16

A tape recording of a growling dog is activated by this device whenever someone presses your doorbell.
ELECTRONICS ILLUSTRATED Sep 1969 (v.12#5) pg. 43

Free-running multivibrator turns Sonalert alarm on and off at a rate of 2 beeps per second.
ELECTRONICS WORLD Dec 1969 (v.82#6) pg. 79

Construction details for two electronic sirens, one with self cycling.
ELECTRONICS WORLD May 1970 (v.83#5) pg. 41

Photoelectric alarm monitors ambient light in a photographic darkroom. When light rises to an unsafe level the alarm goes off, sounding a bell or cutting electrical power. Can be modified for other purposes (burglar, fire, freezing, ...).
ELEMENTARY ELECTRONICS Mar-Apr 1969 (v.8#1) pg. 59

Electronic alarm generator produces a "yelp-yelp-yelp" sound. Sound can be output via headphones or your hi-fi amplifier. Est. cost: $4.
ELEMENTARY ELECTRONICS Jul-Aug 1973 (v.13#4) pg. 77

How to modify the Radio Shack Disaster Alarm kit (#28-4006) to be a smoke, gas, heat, and burglar alarm.
ELEMENTARY ELECTRONICS Sep-Oct 1973 (v.13#5) pg. 40

Alarm circuit for an attache case. Uses a photocell which sets off an alarm if case is opened.
ELEMENTARY ELECTRONICS Sep-Oct 1978 (v.18#5) pg. 69

Li'l Wailer, an electronic siren that can be adjusted from a barely discernible cry to a scream that will attract attention for at least 100-ft around. Powered by a 9-volt battery, it will fit easily into your pocket.
ELEMENTARY ELECTRONICS Sep-Oct 1979 (v.19#5) pg. 57

A look at four types of home detectors: Smoke alarms, gas leak alarms, severe storm alarms and power failure detectors.
FAMILY HANDYMAN #190 May-Jun 1978 (v.28#5) pg. 32

Circuit simulates the warbling "hee-haw" of a British police siren.
HANDS-ON ELECTRONICS Winter 1985 (v.2#3) pg. 72

Yelping siren circuit is similar in concept to the British "hee-haw" police siren.
HANDS-ON ELECTRONICS Spring 1985 (v.2#4) pg. 35

Electronic siren circuit can be incorporated in your home-brew circuits as a warning or signaling device. Simulates the "hee-haw" sound of modern police sirens. Est. cost: $5.
HANDS-ON ELECTRONICS Jan-Feb 1986 (v.3#1) pg. 67

Wailing siren circuit can be custom tailored to produce the most attention-getting effects. Features the sound associated with fire-emergency vehicles.
HANDS-ON ELECTRONICS May-Jun 1986 (v.3#3) pg. 86

Build a frig-door alarm. Sounds off whenever the freezer or refrigerator door is left ajar. A time delay built into the circuit allows for normal access without tripping the alarm.
HANDS-ON ELECTRONICS Jul 1987 (v.4#7) pg. 65

Total security. An overview of today's electronic alarm systems.
HOME MECHANIX #739 Nov 1989 (v.85) pg. 42

Medicine chest alarm.
MECHANIX ILLUSTRATED #512 Jan 1971 (v.67) pg. 106

Circuit for a security wailer. Makes a sound like a fire engine. The rise and fall of the wail pitch, plus the percentage change in pitch, can be adjusted. Est. cost: under $10.
MODERN ELECTRONICS [1] Feb 1978 (v.1#1) pg. 48

Circuit for the continental two-tone blee-bloop siren now being used by emergency vehicles.
MODERN ELECTRONICS [1] Jun 1978 (v.1#4) pg. 67

Circuit to turn a 12-volt police siren on-and-off at three second intervals.
MODERN ELECTRONICS [1] Jul 1978 (v.1#5) pg. 6

A pilot-lamp beeper. Audibly alerts you when an electrical appliance with a pilot lamp is left on. Powered by a 9-volt battery. Requires no connection to the pilot lamp circuit.
MODERN ELECTRONICS [2] May 1985 (v.1#8) pg. 48

Teleguard. Phone accessory automatically calls a preprogrammed telephone number when your burglar/fire alarm or other sensor is tripped. Part 1.
MODERN ELECTRONICS [2] Jun 1985 (v.1#9) pg. 48

Teleguard. Part 2. Conclusion.
MODERN ELECTRONICS [2] Jul 1985 (v.2#1) pg. 60

Teleguard. Part 3. Solid-state sensing modules. Low-cost circuits you build to enhance the operation of the Teleguard security system. Includes light-activated sensors, temperature-sensing module, and fluid-detecting module.
MODERN ELECTRONICS [2] Aug 1985 (v.2#2) pg. 56

Experimenter's interface device. Part 3. Experimenting with input and output lines on a Commodore-64 computer. Projects include a sequential binary counter, alarm clock, power control, and alarm system.
MODERN ELECTRONICS [2] Sep 1985 (v.2#3) pg. 64

Tattle Tale. A unique home or office intruder and emergency monitor that you phone to find out if all is well. Can be used to monitor up to three emergency situations (breakin, fire, flood, heating/cooling failure, etc.).
MODERN ELECTRONICS [2] Dec 1986 (v.3#12) pg. 28

Old-house security: Part 2. Locks and Alarms.
OLD-HOUSE JOURNAL Dec 1986 (v.14#10) pg. 472

"Panic Alarm" makes noise and flashes light.
POPULAR ELECTRONICS [1] May 1964 (v.20#5) pg. 37

Electronic siren circuit.
POPULAR ELECTRONICS [1] Feb 1965 (v.22#2) pg. 78

Very sensitive electronic relay for use in alarms, controls, etc.
POPULAR ELECTRONICS [1] Nov 1965 (v.23#5) pg. 57

Electronic siren circuit contains two multivibrators operating at widely different frequencies.
POPULAR ELECTRONICS [1] Mar 1966 (v.24#3) pg. 79

Switch which can be activated by light, noise or touch is useful in an alarm circuit.
POPULAR ELECTRONICS [1] Jun 1966 (v.24#6) pg. 56

High-power transistorized siren. A 12-volt transistor circuit delivers 15 watts output to horn or speaker.
POPULAR ELECTRONICS [1] Sep 1966 (v.25#3) pg. 55

Two electronic noise makers. A siren and a noise like water dripping.
POPULAR ELECTRONICS [1] Feb 1968 (v.28#2) pg. 33

"Riot Restrainer". Alarm sounds when noise exceeds a predetermined level, turns off when noise level goes down.
POPULAR ELECTRONICS [1] Apr 1969 (v.30#4) pg. 47

Basic blocking oscillator circuit can serve as (1) code practice oscillator, (2) continuity tester, (3) metronome, (4) audio test signal source, (5) alarm signal and (6) basic electronic organ.
POPULAR ELECTRONICS [1] Jan 1970 (v.32#1) pg. 99

Two-tone audible alarm switches from 500- to 1000-Hz five times a second.
POPULAR ELECTRONICS [1] Feb 1970 (v.32#2) pg. 29
Correction POPULAR ELECTRONICS [1] Apr 1970 (v.32#4) pg. 105

Circuit where switching arrangement allows wide-range relaxation oscillator to operate as (1) electronic organ, (2) metronome, (3) thermometer, (4) code practice oscillator, or (5) siren.
POPULAR ELECTRONICS [1] Jun 1970 (v.32#6) pg. 80

Electronic siren circuit.
POPULAR ELECTRONICS [1] Jul 1970 (v.33#1) pg. 86

Build a general-purpose alarm with a siren-like wail that can be triggered by a number of sources.
POPULAR ELECTRONICS [1] Sep 1972 (v.2#3) pg. 64

Applications for the 555 integrated circuit timer chip described in the Nov 1973 issue (p.54). Applications include: (1) Warble alarm circuit, (2) Schmitt trigger or bistable buffer, (3) Square wave oscillator, (4) Output drive considerations, (5) Wide-range pulse generator.
POPULAR ELECTRONICS [1] Jan 1974 (v.5#1) pg. 72

General-purpose audio oscillator can serve as (1) a code-practice oscillator, (2) self-contained audio source for testing microphones and loudspeaker placement or (3) as a signal in an alarm system.
POPULAR ELECTRONICS [1] Sep 1974 (v.6#3) pg. 81

Circuit for producing a "whelper" sound.
POPULAR ELECTRONICS [1] Sep 1974 (v.6#3) pg. 93

Circuit for "wail/whoop" siren generator.
POPULAR ELECTRONICS [1] Oct 1974 (v.6#4) pg. 90

This alarm circuit feeds signal to a background-music PA system.
POPULAR ELECTRONICS [1] Dec 1974 (v.6#6) pg. 68

Circuit to add an exit delay when turning on an alarm system and/or to turn off an alarm system after a period of being enabled.
POPULAR ELECTRONICS [1] Aug 1976 (v.10#2) pg. 24

Electronic Christmas gifts built around the TL489C analog level detector. It can be used to make (1) soil moisture detectors, (2) temperature range indicators, (3) controls and alarms for fish fanciers, chemists, chefs and photographers, (4) battery & continuity testers, (5) toys and games, (6) simple light organs, (7) humidity alarms,...etc.
POPULAR ELECTRONICS [1] Dec 1978 (v.14#6) pg. 78

Fridge Alarm sounds an alarm after preset time when refrigerator door is left open. Est. cost: $10.
POPULAR ELECTRONICS [1] May 1979 (v.15#5) pg. 69

Circuit for a general purpose alarm.
POPULAR ELECTRONICS [1] Oct 1979 (v.16#4) pg. 87

Open-humidor alarm. Circuit sounds an alarm if exposed to light for more than a few seconds. Use to remind someone to replace the top on a humidor.
POPULAR ELECTRONICS [1] Mar 1981 (v.19#3) pg. 92

An appliance "off" reminder. Low-cost project uses a phototransistor to produce an audible alert whenever an appliance indicator light goes off.
POPULAR ELECTRONICS [1] Jun 1981 (v.19#6) pg. 76

Memory circuit for alarm systems warns you if the alarm has been triggered.
POPULAR ELECTRONICS [1] Jun 1981 (v.19#6) pg. 93

Event-failure alarm. Circuit for an alarm which sounds a warning a predetermined time after an event has taken place if no corrective action has been taken.
POPULAR ELECTRONICS [1] Apr 1982 (v.20#4) pg. 107

The 3x3 alarm. The first in a series of projects developed around a 3"x3" printed-circuit board. This battery-powered circuit produces the familiar two-tone, he-haw sound when triggered.
POPULAR ELECTRONICS [2] Feb 1991 (v.8#2) pg. 67
Correction POPULAR ELECTRONICS [2] May 1991 (v.8#5) pg. 3

Sonic Defender. Protect yourself with a blast of high-intensity sound (130 dB) from a hand-held, battery-powered unit. Est. cost: $19 (kit).
POPULAR ELECTRONICS [2] May 1991 (v.8#5) pg. 25
Correction POPULAR ELECTRONICS [2] Jul 1991 (v.8#7) pg. 3
Added Info POPULAR ELECTRONICS [2] Aug 1991 (v.8#8) pg. 4

Siren or loud wail sounder operates for a long time on battery power.
POPULAR ELECTRONICS [2] Jul 1991 (v.8#7) pg. 23

Alarm circuits which utilize the 558 oscillator/timer IC. (1) Circuit that waits a long time to respond to a trigger signal. (2) Circuit that generates extremely long output pulses. (3) Non-bypassable alarm circuit.
POPULAR ELECTRONICS [2] Oct 1992 (v.9#10) pg. 72

Circuit sounds an alarm for 30 seconds if it detects any light for 15 seconds. Can be used to detect an open refrigerator door.
POPULAR ELECTRONICS [2] Nov 1992 (v.9#11) pg. 76

Circuits based on the LM3909 oscillator/flasher IC. (1) Dual LED driver. (2) Tick circuit flashes an LED and gives out a sharp tick on a speaker. (3) Variable audio-frequency oscillator. (4) Electronic siren. (5) Code-practice oscillator. (6) AC lamp flasher.
POPULAR ELECTRONICS [2] May 1993 (v.10#5) pg. 70

Using a single special-purpose IC (the ULN2429A fluid detector) in as many applications as possible. (1) Low-level liquid level detector. (2) High-level liquid level detector. (3) Touch-activated switch. (4) Proximity sensor. (5) Ultrasonic pest repeller. (6) Variable square-wave generator. (7) Code-practice oscillator. (8) Alarm circuit. (9) Light beam circuit (LED-emitter / phototransistor-sensor circuit).
POPULAR ELECTRONICS [2] Jun 1994 (v.11#6) pg. 76

Alarm circuit with all the standard features (exit/entry delay, automatic reset, status indicators, etc.) uses one simple IC.
POPULAR ELECTRONICS [2] Sep 1994 (v.11#9) pg. 26

Build a refrigerator-door alarm. Sounds an "obnoxious" tone when either the refrigerator or freezer door is open or ajar.
POPULAR ELECTRONICS [2] Jun 1996 (v.13#6) pg. 57

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

Alarm projects and keypad interfaces. (1) Warning system isolated from main power source. (2) System-tripped indicator. (3) Time-keeping circuit to remind someone to take a medication. (4) Interface for low-cost telephone-like keypad produces a logic output that identifies the key that has been pressed. (5) Standard telephone-type keypad will operate a relay if the correct four-digit code is entered.
POPULAR ELECTRONICS [2] Feb 1998 (v.15#2) pg. 64
Correction POPULAR ELECTRONICS [2] Apr 1998 (v.15#4) pg. 56

Pocket-size alarm siren provides protection for pedestrians walking alone. Battery powered and variable pitched device. Est. cost: $10.
POPULAR MECHANICS Jan 1966 (v.125#1) pg. 198

By plugging an alarm bell into the light socket of an automatic garage door opener, you can trigger the alarm remotely, from your bedside, during the night. A three-way switch allows you to turn the alarm off when you don't want it activated. Useful as a "panic alarm" to summon help or scare off prowlers.
POPULAR MECHANICS May 1975 (v.143#5) pg. 210

The Lockbox House. Part 13. Electronic security for the leisure home. Includes a surveillance camera, a remote station intercom and an ionization smoke and fire detector.
POPULAR SCIENCE Oct 1974 (v.205#4) pg. 116

Build this thunderstorm alarm. Alarm sounds when lightning strikes are detected within 10 to 20 miles.
RADIO-ELECTRONICS Mar 1980 (v.51#3) pg. 56

Trouble tone alert. Audio alarm circuit monitors an analog test meter. Whenever the meter moves up, the alarm sounds. Use it to help trace intermittent problems in electronic circuits.
RADIO-ELECTRONICS Sep 1980 (v.51#9) pg. 76

Build this super siren alarm with a distinctive sound that will not go unnoticed.
RADIO-ELECTRONICS Apr 1982 (v.53#4) pg. 44

One-gate siren circuit uses few components, is easy to build and the siren's sound can be customized by varying the values of several of the components.
RADIO-ELECTRONICS Oct 1985 (v.56#10) pg. 102

Dual-condition sensing. A look at the 3041 Monitor/Alarm IC, a dual-input circuit designed to monitor two different voltages and give an indication if either varies from the preset level by more than a user-settable predetermined percentage. Useful for various alarm systems.
RADIO-ELECTRONICS Oct 1986 (v.57#10) pg. 89

Two-tone alarm circuit uses a Schmitt trigger.
RADIO-ELECTRONICS Jul 1989 (v.60#7) pg. 67

CMOS phase-locked loops (PLL's). An in-depth look at a particularly versatile CMOS IC, the 4046B micro-power CMOS phase-locked loop. Includes circuits for sound generator, square-wave generator, tone switch, etc.
RADIO-ELECTRONICS Dec 1989 (v.60#12) pg. 55

Home-security cookbook. Part 1. An introduction to modern home-security alarm systems. Typical circuits for fire, burglar and panic alarms. Placement of sensors and controls also covered.
RADIO-ELECTRONICS May 1990 (v.61#5) pg. 61

Home-security cookbook. Part 2. Sirens and various types of "fault-indicator" alarms.
RADIO-ELECTRONICS Jul 1990 (v.61#7) pg. 56

Use perf board construction to build a variable tone siren that will wobble up and down in frequency controlled by a push button.
RADIO-TV EXPERIMENTER #789 Jun-Jul 1966 (v.20#3) pg. 73

Portable electronic siren imitates a police siren's rising and falling pitch.
SCIENCE & ELECTRONICS [1] Aug-Sep 1970 (v.28#4) pg. 43