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  • A touch activated alarm system circuit

    2016-02-19 12:29:0099

    This article describes is a touch-activated alarm system circuit theory. The circuit 555 can be almost any type, they are pin compatible. While some CM...

  • Burglar Alarm for Car Stereos

    2016-02-19 12:14:3765

    We have another interesting application of 555. This is used as a burglar alarm for car stereos. Thieves have, some how, the knack of removing the car ...

  • Personal Alarm (BC327)

    2016-02-19 12:07:5764

    This article describes the Personal Alarm (BC327). The principle is very simple, very practical. The circuit components can help you understand better ...

  • Water Activated Alarm by IC 555

    2016-02-19 11:34:2367

    The circuit uses a 555 timer wired as an astable oscillator and powered by the emitter current of the BC109C. Under dry conditions, the transistor will...

  • Easy Build Motorcycle Alarm circuit diagram

    2016-02-19 11:31:5863

    The following circuit is a simple, cheap and easy build motorcycle alarm. The circuit just required 2 transistors to drive the relay the the relay act ...

  • Gas - smoke alarm circuit with Triac

    2016-02-19 11:25:4361

    When it appears combustible gas, the conductanceof gas sensor TGS308will increase.The voltageon potentiometer RP1 sliding points increases from normal ...

  • Single Zone Alarm

    2016-02-19 11:03:1167

    Description: A single zone alarm circuit with entry and exit delay and other facilities. Notes: The circuit features automatic exit and entry delays, t...

  • Mains Failure Alarm(LM555C)

    2016-02-19 10:51:3569

    This article describes the Mains Failure Alarm (LM555C). The principle is very simple, very practical. The circuit components can help you understand b...

  • DTMF Tone Alarm Dialer Circuit

    2016-02-19 10:42:51100

    Automatic Dialers are a NEW GENERATION of Security Communications and Notification equipment for the Security Professional. Small, Compact and User Fri...

  • Motorcycle alarm circuit 4

    2016-02-19 10:41:0764

    This article describes a motorcycle alarm circuit 4. As long as Duokanjibian The schematic can master the principles of it. This circuit is for technic...

  • DUMMY ALARM Circuit

    2016-02-19 10:34:2768

    DUMMY ALARM Circuit This Dummy Alarm project makes an LED flash briefly once every 5 seconds to imitate the indicator light of a real alarm. Overview T...

  • Motorcycle alarm circuit study

    2016-02-19 10:31:5389

    This article describes a motorcycle alarm circuit. As long as Duokanjibian The schematic can master the principles of it. This circuit is for technical...

  • Wailing Alarm Siren circuit diagram

    2016-02-19 10:23:1265

    Here the wailing alarm circuit diagram: Component parts List: R1,R5___________ 4.7KR2______________ 47KR3______________ 10KR4______________ 100KRx_____...

  • Water High level Alarm

    2016-02-19 10:15:5663

    This can be used as an alarm when filling overhead tanks. Quite some time ago, I used it as an indication when the municipal water used to start flowin...

  • An enhanced four alarm keypad circuit

    2016-02-19 09:53:3462

    This article describes an enhancement of the four alarm keypad circuit. This circuit is not new, but it proved so useful, simple and cheap, it is worth...

  • 8 Second to 8.5 Minute Low Frequency Clock (Intervalometer f

    2016-02-19 09:49:2062

    View Full Size Image View Original Datasheet This circuit example highlights the use of the LTC6991 in a intervalometer for time lapse photography. In ...

  • Door handle alarm

    2016-02-19 09:36:4664

    ?Description. The automatic door handle alarm circuit gives a audible alarm and glows a LED when somebody touches the handle of the door.The circuit is...

  • Clocked SR Flip-Flop

    2016-02-19 09:28:3261

    Java-Runtime is required for Circuit Simulation. Download Java for Windows Download Java for Linux Download Java for Other OS Start Simulation Circuit ...

  • How to build Doorbell for the Deaf

    2016-02-19 09:18:2663

    Description: This circuit provides a delayed visual indication when a door bell switch is pressed. In addition, a DPDT switch can be moved from within ...

  • Personal alarm schematic

    2016-02-19 09:03:0066

    This article is a personal alarm schematic presentation. Master the principle is very effective method is to combine text read schematics. The personal...

  • Experimental Pendulum Clock

    2016-02-19 09:02:3769

    Using this design, you can construct an electromagnetically impulsed pendulum clock with a 1-second beat. On the prototype, the pendulum rod is 115cm l...

  • Auto Burglar Alarm

    2016-02-19 08:04:1268

    This alarm circuit is based on two 555 timers. The alarm willsound your car hornif anyone opens the car door while the circuit is armed. The timers wil...

  • 5 Zone alarm circuit

    2016-02-19 07:55:4063

    This is a complete alarm system with 5 independent zones suitable for a small office or home environment. It uses just 3 CM IC`s and features a timed e...

  • Door Timer Circuit with Alarm

    2016-02-19 07:41:5667

    We are in a digital era! Now we can add some intelligence to our doors and gates without too much investments. Just assemble this little door timer cir...

  • Car Speed Limit Warnings Circuit

    2016-02-19 07:32:1180

    Parts: R1,R2,R19_______1K 1/4W ResistorsR3-R6,R13,R17_100K 1/4W ResistorsR7,R15__________1M 1/4W ResistorsR8_____________50K 1/2W Trimmer CermetR9_____...

  • A water-activated alarm circuit

    2016-02-19 07:28:4369

    The article describes a water-activated alarm circuit. The circuit is very simple, very helpful. The circuit uses a 555 timer circuit connection as a p...

  • Fridge Door Alarm Circuit(1N4148)

    2016-02-19 07:20:43124

    This article briefly describes the Fridge Door Alarm Circuit (1N4148). Although this circuit is very easy to understand, but also very practical. Circu...

  • Fire alarm circuit

    2016-02-19 07:13:4066

    Description. Here is a simple fire alarm circuit based on a Light Dependent Resistor (LDR) and lamp pair for sensing the fire. The alarm works by sensi...

  • Detected by The Photoelectric-type Smoke Alarm Circuit of IC

    2016-02-19 07:08:5364

    TheMC145010constitute the smoke alarm circuit as shown. It uses a 9V laminated battery power supply. R2, C3, respectively, the oscillation resistor and...

  • Precision Receiver Battery Low Voltage Alarm (LM311N)

    2016-02-19 07:08:0387

    This article describes the Precision Receiver Battery Low Voltage Alarm (LM311N). The content is very simple, very helpful. Components in this article ...

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