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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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ANNUNCIATOR sa DOORBELL xx DOORBELL xx INTERCOM xx SIGNALING Vehicle detection systems. A look at the sensing technologies and installation considerations for signaling the arrival of a vehicle in your driveway. Using an X-10 module and Powerflash Interface to turn on a lamp when triggered by an open door/gate latch, telephone ringer, sump pump malfunction, or some other device. TV "call box" allows TV sound to be interrupted and used as a loudspeaker for calling people watching TV. Simple messages printed on lenses of lamp sockets can be illuminated remotely to signal reply to a caller at your door or office. Messages like "I am busy", "You may enter", "I am not in" can be easily conveyed by this device. Novel door annunciator circuit provides an attention-getting "Whoop" sound that is not easy to ignore. Light-sensitive alarm circuit (annunciator) sounds an audio alert whenever someone enters a door. Simple "burglar alarm" circuit consists of a mat switch that will ring a bell when stepped on. Cockpit idiot lights (annunciator lights). Part 1. Low voltage and high voltage lights. Cockpit idiot lights (annunciator lights). Part 2. Pressure and temperature sensor circuits. Cockpit idiot lights (annunciator lights). Part 3. Circuit to monitor multiple warning lamps and summarize the status using a single green, yellow, or red LED. Build a low-cost voice annunciator circuit which monitors existing annunciator lights (idiot lights) and issues an audio message whenever they turn on. Old-house intercoms. Part 1. Buzzers, beepers, buttons, bells and speaking tubes. Includes diagram of wiring for old annunciators, a box with a bell and lights that indicate the room where the button was pressed. Old-house intercoms. Part 2. How to pinpoint problems in old electric bell systems and annunciators. The in-out annunciator can detect which way the object was moving which broke the beam of light. Est. cost: $20. More circuits using the 555 IC timer include (1) tone generator, (2) code practice oscillator, (3) CW monitor and (4) electric-eye annunciator. Door monitor circuit signals if an outer door has been opened and continues to signal until a reset button is pressed. Expandable two-door annunciator circuit provides two distinctively different tones. Sentry Strobe alert system. A flashing strobe light is used to call attention to a ringing phone, intruder detector, temperature conditions, etc. Adding a loud horn to an intercom system. This modified annunciator is ideal for a noisy environment. Door Minder. After a built-in 24-second delay to allow for normal opening and closing, this electronic chime will sound once-per-second until a door is closed. Door annunciator circuit sounds a buzzer whenever a door is opened. Solid-state circuit to replace an electromechanical buzzer. Patio alert. A wireless receiver which can be activated by three transmitters which in turn can be activated by anything that makes a noise (doorbell, telephone, baby crying, etc...). House wiring carries signal. Receiver buzzes and turns on a light indicating source of noise. Little pro beep. Easy to build programmable beeper can be used as the heart of a call system. Can be set to beep once, twice or four times, repeating the signal automatically. Tips on using a thirty-tune melody microprocessor in a doorbell system, music box, annunciator, etc. Entryway monitor. An electronic "watchdog" circuit or annunciator can operate either in audible or silent mode to tell you if anyone has entered your home. "Parasitic signaller" makes the doorbell circuit do double-duty as both an annunciator and as a communications system. A surge in the doorbell wiring will cause this buzzer to sound in the basement. A unique message-leaving device. A "nixie" tube which will display any digit from 0 to 9 is inserted into the center of an artificial flower that is included in a bouquet of artificial flowers on a secretary's desk. A control knob turns on any one of the digits and signals the secretary or leaves a message for her when you are gone. | |||||||||
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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