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  • Single Alarm Circuit

    2016-02-20 06:44:0263

    Here is single alarm circuit. The circuit features automatic exit and entry delays, timed bell cut-off and system reset. It has provision for normally ...

  • Anti-theft alarm circuit

    2016-02-20 06:13:0867

    This article describes the burglar alarm circuits. The circuit is very simple but effective utility, worth Duokanjibian then master the principles of t...

  • Oscillator Temperature alarm circuit

    2016-02-20 06:05:0961

    Temperature alarm is Designed to alert homeowners whenever environmental changes present a threat to the home, these do-it-yourself devices are a must ...

  • Bells Ring Generator Circuit Schematic

    2016-02-20 05:58:2267

    Three circuit options, Can be synchronized to Christmas tree flashing lights This circuit generates a dual-tone bells ringing similar to most door-bell...

  • Chrysler Single Wire Door Lock/Unlock Alarm System Circuit D

    2016-02-20 05:32:3863

    The followingcircuit diagrams the Chrysler Single Wire System. The 1995 Cirrus/Dodge Stratus use this door locking system, another Chrysler models such...

  • Fixed Frequency Piezoelectric Alarm Circuit

    2016-02-20 05:28:3470

    A common piezoelectric alarm has many valuable attributes. It is compact, lightweight, efficient and reliable. However, the loud, high-pitched sound ou...

  • Sun-Up Alarm

    2016-02-20 05:26:0368

    Sun-Up Alarm The Sun-Up Alarm can be used to provide a audible alarm for when the sun comes up or it can be used in a dark area and detect when a light...

  • Pyroelectric Fire Alarm System circuit diagram

    2016-02-20 05:21:1492

    This is definitely an ultra-sensitive fire sensor that exploits the direct piezoelectric property of an ordinary piezo component to recognize the fire....

  • Low-Cost Low-Intensity Alarm

    2016-02-20 05:11:0765

    Ever needed an alarm to monitor something but you didn't want to annoy the neighbours or scare the hell out of the family in the middle of the night? U...

  • Shadow Alarm Circuit

    2016-02-20 04:57:3464

    This shadow alarm circuit can sense a moving shadow in a confined area. It can be used to protect things from theft. When somebody approaches the unit,...

  • AC Line Under/Over Voltage Alarm

    2016-02-20 04:57:0567

    Power lines, which deviate much beyond normal voltages can damage expensive electronic equipment. The circuit below sounds an alarm whenever the line v...

  • Warning Alarm circuit with CD4001

    2016-02-20 04:54:2364

    Unorthodox warning alarm circuit presented here is infact a single chip based general purpose sounder, which produces a pulsed alert tone when its inpu...

  • Temperature Alarm with Op-Amp Comparator

    2016-02-20 04:47:1764

    The circuit below is configured as a comparator. A fixed reference voltage at the non inverting input is provided by R1 and R2. The inverting input vol...

  • How to build A Transistor Based Motorcycle Alarm

    2016-02-20 04:27:1967

    Description Although designed to work at 12-volts - this alarm is easily adapted for a 6-volt system. So it will protect your Classic Bike. And because...

  • How to build A Shed / Garage Alarm

    2016-02-20 04:27:1777

    Description It has an extremely small standby current - making it ideal for battery-powered operation. This is particularly useful where your garage/sh...

  • A modular burglar alarm circuit.

    2016-02-20 04:01:4864

    This article describes a modular burglar alarm circuit. For your better understanding in the diagram, we recommend that you look at the text. This circ...

  • How to build Smoke Alarm Battery Life Extender

    2016-02-20 03:54:2964

    Description While smoke alarms are quite cheap devices, the cost of 9V batteries quickly exceeds their purchase price. Added to that is the irritation ...

  • Mains Remote-Alert

    2016-02-20 03:51:0967

    Warning! These units are connected to 220Vac mains, then some parts in the circuit boards are subjected to lethal potential!. Avoid touching the circui...

  • Laser Alarm

    2016-02-20 03:46:2664

    This circuit is a laser alarm system like the one we see in various movies. It uses a laser pointer beam to secure your valuables and property. Essenti...

  • Low Voltage Alarm

    2016-02-20 03:26:1969

    This low voltage circuit can be used to monitor batteries and other volatile sources of current for problems. The circuit sounds an alarm and lights an...

  • 5 Zone Alarm System Schematic presentation

    2016-02-20 03:22:2370

    The article describes the five zones alarm system circuit. The circuit is very simple, very helpful. If you understand this principle is not very thoro...

  • Alarm System for Entrance/Exit Gate

    2016-02-20 03:13:2365

    Figure 1 The circuit employs the functions of reed switches to produce a gate alarm that is powered by a universal AC/DC power supply Oscillator – an...

  • Door ajar alarm

    2016-02-20 03:01:3463

    Door ajar alarm can senses to the door ajar. If the door ajar longer than 20 seconds, the alarm will beep alarm. The alarm circuit is driven by magneti...

  • Single-op-amp-clock

    2016-02-20 03:00:1166

    Capacitor C1 is charged through timing resistor R1 when the clock output is high. When C1 reaches the upper threshold voltage, the output signal decrea...

  • 5 Digit Alarm Keypad

    2016-02-20 02:53:3064

    Description This is an enhanced 5 digit keypad which may be used with the Modular Alarm System Circuit Notes This switch will suit the Modular Burglar ...

  • Alarm Circuit for Water Level Display

    2016-02-20 02:46:5162

    Figure 1 The circuit was intended for monitoring and measuring the fluid level or content in a storage tank or reservoir by providing visual display wi...

  • Motorcycle Alarm Series

    2016-02-20 02:39:4866

    This circuit is designed to create an early warning alarm system for any form of theft that are important to the owners of a motorcycle or bicycle. Thi...

  • Automotive ice alarm circuit

    2016-02-20 02:24:0066

    The car alarm ice circuit uses three parts and the thermistor LM3900quad op amp IC. When the temperature drops to 36 F LED indicator flashes once every...

  • Frost Alarm

    2016-02-20 02:15:3763

    Circuit diagram Notes: The thermistor used has a resistance of 15k at 25 degrees and 45k at 0 degrees celsius. A suitable bead type thermistor is found...

  • Cmos 4060 Burglar Alarm

    2016-02-20 02:05:5963

    Description: This is a single zone alarm - with automatic exit, entry and siren cut-off timers. It will accommodate all the usual types of normally-clo...

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