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  • Musical doorbell circuit

    2016-02-21 23:53:17111

    In many cases, a doorbell that sounds off a musical tone is preferable over the common buzz sound. This featured circuit is a musical doorbell. After t...

  • Delayed Car Door Alarm

    2016-02-21 23:14:4088

    Opening cars door is very simple activity, and off course its just a daily activity which require no special skill. Almost nothing can go wrong, but fo...

  • I2C clock and LC data output buffer Lines circuit

    2016-02-21 23:11:0691

    A data output buffer for use in a semiconductor memory with a junction-field-effect-transistor. The data output buffer has a N-channelMOSFET TN1 with i...

  • Automatic Night Lamp with Morning Alarm

    2016-02-21 22:31:10105

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

  • Hack Your Doorbell

    2016-02-21 22:29:40116

    Hack Your Doorbell Ripped from the pages of Popular Science (December 2007) Customize your dingdong with a Dingtone It seems like everywhere you go, so...

  • 1Hz Clock Generator with Chip On Board (COB) circuit diagram

    2016-02-21 21:31:5484

    This is the 1Hz clock generator circuit with Chip On Board (COB). Commonly, the circuits to produce 1Hz clock for digital clock and counter circuits ap...

  • Fridge door Alarm (CD4060)

    2016-02-21 21:26:16106

    This article describes the Fridge door Alarm (CD4060). The principle is very simple, very practical. The circuit components can help you understand bet...

  • How to build Speed-limit Alert

    2016-02-21 21:15:2882

    Wireless portable unit Adaptable with most internal combustion engine vehicles Circuit diagram Parts: R1,R2,R19 1K 1/4W ResistorsR3-R6,R13,R17 100K 1/4...

  • Infrared alarm barrier circuit

    2016-02-21 21:10:57120

    This infrared alarm barrier can be used to detect persons passing through doorways, corridors and small gates. The transmitter emits a beam of infrared...

  • Door Bell Circuit Schematic Diagram (SI4425BDY)

    2016-02-21 20:51:4590

    This article describes the Door Bell Circuit Schematic Diagram (SI4425BDY). The content is very simple, very helpful. Components in this article can he...

  • Lamp flashing alarm automatic

    2016-02-21 20:40:24100

    The Lamp flashing circuit is basic flasher 6V that low current and small size. which we use the transistors are 2 pcs ,is NPN 2N3904 and PNP-2N3906 typ...

  • Single CMOS alarm circuit

    2016-02-21 20:37:09101

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

  • Open And Close Loop Detector Security Alarm

    2016-02-21 20:18:55111

    We understand the importance of home security and specialise in the installing and servicing of security systems. This alarm features open- and closed-...

  • Remote Alarm For Smoke Detector

    2016-02-21 19:39:2489

    Remote Alarm For Smoke Detector Description This alarm circuit was designed to monitor a mains-poweredsmoke detectorlocated in a shed (which is used to...

  • Infrared Proximity Detector Alarm(LD274)

    2016-02-21 19:12:46109

    This article briefly describes the Infrared Proximity Detector Alarm (LD274). Although this circuit is very easy to understand, but also very practical...

  • A burglar alarm Chaser Circuit

    2016-02-21 19:10:4571

    A burglar alarm circuit is designed to sound an alarm when the circuit is broken. Find out how a burglar alarm circuit works and see inside a magnetic ...

  • Graphical Alarm Clock (Atmel ATmega32). Part 2

    2016-02-21 18:49:5863

    Software: The software is written in a state machine manner. Here are the states: (the state numbers were chosen randomly) State 1: Show the power up g...

  • Everything-that-moves ALARM Circuit Description

    2016-02-21 18:34:5079

    This article is Everything - that - moves the ALARM circuit diagram. The circuit is not new, but it proved so useful, simple and cheap, worth building....

  • Wire Security Loop Alarm

    2016-02-21 18:12:5869

    A wire loop is used to protect valuable objects in this alarm circuit. The circuit is powered by a 9v battery. Reprinted Url Of This Article: http://ww...

  • Twin Bell Circuit Circuit

    2016-02-21 18:09:0262

    It is often desirable for a single doorbell to be operated by two buttons, for instance, one at the front door and the other at the back door. The addi...

  • Electronic doorbell circuit

    2016-02-21 18:04:4869

    This simple and cost-effective ding dong electronic doorbell circuit is based on IC 8021-2. The IC has an in-built circuitry to produce ding dong sound...

  • Ringer Circuit Using Sam Clock Method

    2016-02-21 16:35:5462

    Figure 1 4511 – a BCD to 7-segment decoder driver used to convert the logic states at the outputs of a binary coded decimal ( BCD ) into signals that...

  • RC Receiver Battery Low Voltage Alarm (2N3906)

    2016-02-21 16:32:5279

    This article describes the RC Receiver Battery Low Voltage Alarm (2N3906). The content is very simple, very helpful. Diagram showing the principle is a...

  • Fake Car Alarm Circuit

    2016-02-21 16:31:5863

    This simple fake car alarm or alarm decoy circuit device will simulate the presence of a burglar alarm in automobiles or homes. It has a few components...

  • Broken charger wire alarm circuit

    2016-02-21 16:09:1361

    Description. This circuit will produce a visual as well as audible alert whenever the connection between the charger circuit and the battery being char...

  • 12V car icing alarms

    2016-02-21 15:14:0462

    As long as the temperature of the air near the ground close to 0:00, the alarm circuit will be prompted to cars drivers may be icy pavement this inform...

  • Water Level Alert

    2016-02-21 15:13:0070

    Beeper or flashing LED alert, 1.5V battery powered portable unit This circuit will emit an intermittent beep (or will flash a LED) when the water conta...

  • Principles water level indicator and alarm display

    2016-02-21 15:04:23137

    This article is the display of the principle of the water level indicator and alarm. The circuit not only suggest that amount of water in the high slot...

  • DoorBell circuit using UM 66 IC

    2016-02-21 14:53:4369

    Doorbell Circuit Description Here is a simple and easy to builddoorbell circuitusing IC UM 66.The? details of UM 66? is given in the older post Melody ...

  • How to build Mini Alarm

    2016-02-21 14:42:1375

    Description This circuit, enclosed in a small plastic box, can be placed into a bag or handbag. A small magnet is placed close to the reed switch and c...

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