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  • Night Alert

    2016-02-19 17:56:2465

    Idea of this circuit came to me at midnight when my pet dog started barking continuously on sensing a moving shadow, perhaps that of an intruder. Dogs ...

  • Carrier Baby cry Alert Transmitter Circuit

    2016-02-19 17:48:2473

    The Baby cry transmitter will tell you when your baby needs your attention, no matter if you are several rooms apart. When your baby cries, it will sig...

  • Travel Touch Alarm

    2016-02-19 17:40:0363

    The Travel Touch Alarm can be used to provide a audible alarmwhen someone touches the door knob or handle of your hotel room. The door knobor handle mu...

  • basic electronic bell by IC741

    2016-02-19 17:34:03108

    This is a basic electronic ell circuit, it is interesting. We use a number of IC 741, it works. When you press S1 it will mimic the sound a bell,by can...

  • How to build An Expandable Multi-Zone Modular Burglar Alarm

    2016-02-19 16:44:3769

    Description The Basic Alarm Circuit has an automatic Exit/Entry Zone - an Instant Alarm Zone that will accept both normally-closed and normally-open tr...

  • Fire Alarm

    2016-02-19 16:16:5668

    Circuit The circuit makes use of characteristic of a diode. As already explained normally diode conducts only in one direction and it blocks voltage in...

  • Cheap Motorcycle Alarm (UM3561)

    2016-02-19 16:16:1072

    This article describes the Cheap Motorcycle Alarm (UM3561). The content is very simple, very helpful. Components in this article can help you understan...

  • Snoring alarm circuit

    2016-02-19 16:10:4584

    This article shows that snoring alarm circuit. To better grasp this principle, you can combine text understandable that circuit. For a more thorough gr...

  • Parallel loop and closed loop Alarm Circuit

    2016-02-19 16:09:1080

    For the parallel loop configuration is used four switches connected in parallel and are used for monitoring . When one of the four switch is closed SCR...

  • How to build Doorbell Memory Circuit Diagram

    2016-02-19 15:32:3063

    Description If you’re expecting an important visitor but you just have to step out for a moment, an electronic doorbell memory can come in handy so y...

  • LASER Door Alarm circuit

    2016-02-19 15:25:0270

    This laser door alarm is based on the interruption of Laser beam. A low cost Laser pointer is used as the source of light beam. When somebody breaks th...

  • Security system with anti-theft alarm

    2016-02-19 15:17:5769

    This alarm circuit is suitable to drive an intruder or a thief. As the main component is a sensor which is a component of LDR (Different Light Resistan...

  • Circuit Diagram of Burglar Modular Alarm (74HC165PW)

    2016-02-19 15:17:1265

    This article describes the Circuit Diagram of Burglar Modular Alarm (74HC165PW). The content is very simple, very helpful. Components in this article c...

  • Rain alarm

    2016-02-19 15:12:1465

    The circuit uses four NAND gates of a 4011 package. In each oscillator, while one gate is configured as a straightforward inverter, the other has one i...

  • Single Zone CMOS Alarm

    2016-02-19 15:04:2861

    Description: Circuit : Ron J Email Ron Description: This circuit features automatic Exit/Entry delays, timed Bell Cut-off and SystemReset. It has provi...

  • Home Burglar Alarm Auto Shut Off Tone Generator

    2016-02-19 14:56:1672

    This is a typical home burglar alarm system of which once the alarm is triggered ON, it will not be shut OFF until the duration of time set has elapsed...

  • How to build Bell Alarm

    2016-02-19 14:44:2368

    Description If you use a lamp with a motion sensor for outdoor lighting, the original electrical switch is actually no longer necessary. If you replace...

  • Musical Doorbell

    2016-02-19 14:41:2666

    8 to 15 Vac is applied to terminals C and D, which produces a dc voltage across R2, and turns on Ql. This connects the bat teries B1 and B2 to the rest...

  • Burglar Alarm with Expandable Modules

    2016-02-19 14:37:2464

    Figure 1 The circuit has been designed to provide an alarm system against any form of burglary wherein it can be expanded by adding modules and zones a...

  • Smoke detector alarm schematic with RE46C140

    2016-02-19 14:30:4164

    Sensors Using the RE46C140 circuit can be designed a very simple smoke detector alarm using few external electronic components . The RE46C140 IC is a l...

  • Burglar-alarm

    2016-02-19 14:27:4164

    The single-chip, burglar -alarm circuit shown uses a dual 556 timer, draws 10 mA of standby current, and generates a pulsing alarm signal that conserve...

  • Wailing Alarm Siren (NE555)

    2016-02-19 14:06:5272

    This article describes the Wailing Alarm Siren (NE555). The principle is very simple, very practical. The circuit components can help you understand be...

  • Intel 845G/845GL/845GV GMCH Chipset System Clock and AGP Cha

    2016-02-19 14:00:0465

    The figure shows a block diagram of an 845G chipset-based system (enlarged click). The type of this series which is known asIntel 82845G GMCH has the f...

  • ANAC Tell A Bell Circuit

    2016-02-19 13:47:5265

    An automatic number announcement circuit (ANAC) is a special telephone number that is meant to be used by phone company technicians and other telecommu...

  • Alarm Generator Project Using UM66TXXL CMOS IC

    2016-02-19 13:41:3277

    Alarm Generator Circuit Project Using UM66TXXL CMOS IC Melody Music Project Description This simple alarm generator electronics circuit utilizes a UM66...

  • samclock ringer

    2016-02-19 13:24:4061

    SamClock Ringer ?? SamClock RINGER ,???????? ?????? ????????? ??? ???????? ????????SamClock. ?? ???? ?? ??????? ???????? ??? ????????????????? ????? ??...

  • Wireless Car Alarm circuit diagram

    2016-02-19 12:58:1469

    This circuit is a wireless car alarm system that is built using two circuit modules, namely modules of transmitter and receiver modules. This circuit w...

  • Water Alarm Circuit Diagram

    2016-02-19 12:51:4867

    Have you ever seen the stairs to one of the upper stories in your house turn into a waterfall? Or maybe youve come home to find your aquarium fish tryi...

  • How to build Bells Ring Generator Circuit Schematic

    2016-02-19 12:48:1566

    Description This circuit generates a dual-tone bells ringing similar to most door-bell units. It can be used in many applications other than door-bell....

  • Timer with alarm circuit

    2016-02-19 12:44:4566

    This simple alarm timer circuit is made with 4060 which has an integrated oscillator with a good stability with a relatively wide frequency range. In t...

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