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  • Semiconductor Failure False Alarm

    2016-02-21 03:20:3167

    Afalsealarm, also called anuisance alarm, is the deceptive or erroneous report of an emergency, causing unnecessary panic and/or bringing resources (su...

  • Precision Receiver Battery Low Voltage Alarm

    2016-02-21 03:19:2963

    Flying hand launch gliders means living with small capacity receiver NiCad battery packs. These small packs are light, but have the distinct disadvanta...

  • Doorbell for the Deaf CIRCUIT (ZTX550)

    2016-02-21 02:48:3791

    This article describes the Doorbell for the Deaf CIRCUIT (ZTX550). The content is very simple, very helpful. Components in this article can help you un...

  • Miniatur Alarm Generator Circuit for Laptop Protector

    2016-02-21 02:47:57103

    The diagram below appears Miniatur Alarm Generator Circuit for Laptop Protector. It such a home made tilt switch fixed inside the laptop case in order ...

  • Cheap Motorcycle Alarm circuit diagram

    2016-02-21 02:43:15117

    This is simple to build and cheap motorcycle alarm circuit which could be fitted in motorcycles to take care of them from getting stolen. The tiny circ...

  • Everything-that-moves ALARM

    2016-02-21 02:35:5665

    A crucial failing of proximity detectors is their unreliable and tricky nature. This is where they are used to detect humans, not to speak of smaller l...

  • Car Burglar Alarm system with radio wave signal

    2016-02-21 02:10:3569

    When steal open automobile door relay K1 and K2 work make have voltage 12V give radio transmitter and origin sound part for mix radio waves steal will ...

  • Shock alarm circuit

    2016-02-21 01:55:3366

    ?Description. Here is a simple shock sensitive alarm circuit that has many many applications fro home to automobiles.The main application of this circu...

  • Software for the DS1302 Real Time Clock

    2016-02-21 01:55:0673

    The DS1302 Trickle Charge Timekeeping Chip contains a real time clock/calendar and 31 bytes of static RAM. It communicates with a microprocessor via a ...

  • Dark-Activated Alarm With Pulsed Tone Output Circuit

    2016-02-21 01:24:2766

    NOR gates a and b form a low-frequency oscillator that is activated when the CDS cell, under dark conditions, causes NOR gate a to see a logic zero at ...

  • Mains Supply Failure Alarm(CD4538 )

    2016-02-21 01:22:29138

    This article briefly describes the Mains Supply Failure Alarm (CD4538). This principle is easy to understand, but also very practical. Depth understand...

  • Alarm Circuit - 5 Zone

    2016-02-21 01:19:0365

    This article describes is a separate area with five complete alarm system. The system is suitable for use in a small office or home environment. Each r...

  • How to build Frost Alarm

    2016-02-21 00:44:2266

    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...

  • Delayed Car Door Alarm (2N4920)

    2016-02-21 00:28:4163

    This article describes the Delayed Car Door Alarm (2N4920). The principle is very simple, very practical. The circuit components can help you understan...

  • Night lamp with alarm

    2016-02-21 00:26:4361

    This circuit automatically turns on a night lamp when bedroom light is switched off. The lamp remains ‘on’ until the light sensor senses daylight i...

  • Oscillator-clock-generator

    2016-02-21 00:03:0767

    This self-starting fixed-frequency oscillator circuit gives excellent frequency stability. R1 and C 1 comprise the frequency-determining network, while...

  • speed alert wireless portable unit (BZX79C7V5)

    2016-02-21 00:01:0263

    Adaptable with most internal combustion engine vehicles Parts: R1,R2,R19_______1K 1/4W Resistors R3-R6,R13,R17_100K 1/4W Resistors R7,R15__________1M 1...

  • Cashbox or Locker Alarm

    2016-02-20 23:39:4270

    The locker alarm circuit or cashbox watcher can be used to protect a cashbox/locker from unauthorised access. This tried and tested design forms a fool...

  • Burglar Alarm Works for Both N.O and N.C Contacts

    2016-02-20 23:35:5868

    Unlike other alarm circuit that provide normally-open only or normally-closed only configuration, this alarm circuit work for both configurations. The ...

  • Remote Alarm For Smoke Detector(MOC3021)

    2016-02-20 23:26:4866

    This article briefly describes the Remote Alarm For Smoke Detector (MOC3021). Although this circuit is very easy to understand, but also very practical...

  • Alarm Circuit for Snoring Prevention ( NE555 )

    2016-02-20 23:17:0462

    This article briefly describes the Alarm Circuit for Snoring Prevention (NE555). This principle is easy to understand, but also very practical. Depth u...

  • Countdown timer with alarm

    2016-02-20 23:06:1269

    This circuit is IC implementation schedule. No. 555 applied with IC number LM3905.(More circuits used LM3915) By the IC to the number 555 are the circu...

  • Laser Alarm(BPW34)

    2016-02-20 23:00:011373

    This article briefly describes the Laser Alarm (BPW34). This principle is easy to understand, but also very practical. Depth understanding of circuit e...

  • A door alarm circuit principle

    2016-02-20 22:51:3972

    The article describes a door alarm circuit principle. The circuit is very simple, very helpful. If you understand this principle is not very thorough, ...

  • Frost Alarm Circuit

    2016-02-20 21:53:1065

    Description: A simple thermistor triggered switch with adjustable threshold. It triggers with cold temperatures so may be used as a frost alarm or cold...

  • Clock source

    2016-02-20 21:48:0181

    A clock source using LM311 voltage comparator in positive feedback mode to minimize clock frequency shift problem. Reprinted Url Of This Article: http:...

  • Car Burglar Alarm timer delay using NE556

    2016-02-20 21:22:4473

    Car Burglar Alarm timer alarm system circuit , model to economize. This circuit convenients for to set up in an automobile. usually switch at set up ke...

  • Car Battery Alarm

    2016-02-20 21:19:2069

    For Check battery in car, It use IC CA3140 and Transistor, Easy circuit. circuit Car Battery Alarm by IC CA3140 For electricity pressure of automobile ...

  • Alarm Circuit for Refrigerator Doors

    2016-02-20 20:49:0663

    Figure 1 Parts List The circuit will provide a beeping sound to alarm the household that the refrigerator door has been opened for more than 20 seconds...

  • Fridge Door Alarm Schematic 2nd Version

    2016-02-20 20:25:4163

    Alternative version of the popular circuit, 3V battery supply - Still operating at 1.3V The main purpose of this design was to obviate a small defect o...

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