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Last Updated
03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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ALARM & SIREN sa AUTOMOBILE SECURITY SYSTEM sa BOAT SECURITY SYSTEM sa ELECTRIC POWER-FAILURE ALARM sa FIRE ALARM sa GAS DETECTOR sa INTRUSION ALARM sa LIQUID ACTIVATED ALARM sa SECURITY SYSTEM sa SWIMMING POOL ALARM sa TEMPERATURE ACTIVATED ALARM sa TOUCH ALARM x SIREN xx SECURITY SYSTEM xx SOUND EFFECTS Low-cost alarm system you can build to sound a horn or turn on a light. Circuits for sensors in computer-controlled alarm systems. Experimenting with a piezoelectric speaker includes a circuit for a portable siren. Circuit for an electronic "fire engine" alarm. Est. cost: under $10. Refrigerator tone alarm beeps whenever the door is left open for more than 20 seconds. Triggered by refrigerator light. How to control the Heath/Zenith Barking Dog Alarm via an X-10 universal module. A tape recording of a growling dog is activated by this device whenever someone presses your doorbell. Free-running multivibrator turns Sonalert alarm on and off at a rate of 2 beeps per second. Construction details for two electronic sirens, one with self cycling. 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, ...). Electronic alarm generator produces a "yelp-yelp-yelp" sound. Sound can be output via headphones or your hi-fi amplifier. Est. cost: $4. How to modify the Radio Shack Disaster Alarm kit (#28-4006) to be a smoke, gas, heat, and burglar alarm. Alarm circuit for an attache case. Uses a photocell which sets off an alarm if case is opened. 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. A look at four types of home detectors: Smoke alarms, gas leak alarms, severe storm alarms and power failure detectors. Circuit simulates the warbling "hee-haw" of a British police siren. Yelping siren circuit is similar in concept to the British "hee-haw" police siren. 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. Wailing siren circuit can be custom tailored to produce the most attention-getting effects. Features the sound associated with fire-emergency vehicles. 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. Total security. An overview of today's electronic alarm systems. Medicine chest alarm. 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. Circuit for the continental two-tone blee-bloop siren now being used by emergency vehicles. Circuit to turn a 12-volt police siren on-and-off at three second intervals. 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. Teleguard. Phone accessory automatically calls a preprogrammed telephone number when your burglar/fire alarm or other sensor is tripped. Part 1. Teleguard. Part 2. Conclusion. 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. 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. 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.). Old-house security: Part 2. Locks and Alarms. "Panic Alarm" makes noise and flashes light. Electronic siren circuit. Very sensitive electronic relay for use in alarms, controls, etc. Electronic siren circuit contains two multivibrators operating at widely different frequencies. Switch which can be activated by light, noise or touch is useful in an alarm circuit. High-power transistorized siren. A 12-volt transistor circuit delivers 15 watts output to horn or speaker. Two electronic noise makers. A siren and a noise like water dripping. "Riot Restrainer". Alarm sounds when noise exceeds a predetermined level, turns off when noise level goes down. 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. Two-tone audible alarm switches from 500- to 1000-Hz five times a second. 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. Electronic siren circuit. Build a general-purpose alarm with a siren-like wail that can be triggered by a number of sources. 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. 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. Circuit for producing a "whelper" sound. Circuit for "wail/whoop" siren generator. This alarm circuit feeds signal to a background-music PA system. 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. 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. Fridge Alarm sounds an alarm after preset time when refrigerator door is left open. Est. cost: $10. Circuit for a general purpose alarm. 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. An appliance "off" reminder. Low-cost project uses a phototransistor to produce an audible alert whenever an appliance indicator light goes off. Memory circuit for alarm systems warns you if the alarm has been triggered. 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. 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. Sonic Defender. Protect yourself with a blast of high-intensity sound (130 dB) from a hand-held, battery-powered unit. Est. cost: $19 (kit). Siren or loud wail sounder operates for a long time on battery power. 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. Circuit sounds an alarm for 30 seconds if it detects any light for 15 seconds. Can be used to detect an open refrigerator door. 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. 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). Alarm circuit with all the standard features (exit/entry delay, automatic reset, status indicators, etc.) uses one simple IC. Build a refrigerator-door alarm. Sounds an "obnoxious" tone when either the refrigerator or freezer door is open or ajar. 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. 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. Pocket-size alarm siren provides protection for pedestrians walking alone. Battery powered and variable pitched device. Est. cost: $10. 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. 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. Build this thunderstorm alarm. Alarm sounds when lightning strikes are detected within 10 to 20 miles. 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. Build this super siren alarm with a distinctive sound that will not go unnoticed. 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. 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. Two-tone alarm circuit uses a Schmitt trigger. 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. 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. Home-security cookbook. Part 2. Sirens and various types of "fault-indicator" alarms. Use perf board construction to build a variable tone siren that will wobble up and down in frequency controlled by a push button. Portable electronic siren imitates a police siren's rising and falling pitch. | |||||||||
Copyright © by Norman Lathrop Enterprises. All Rights Reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means (electronic, mechanical, print photocopying, recording or otherwise) without the prior expressed permission of Norman Lathrop Enterprises, except as permitted by law. |
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