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  • Circuit Diagram 6 zone alarm independent

    2016-02-20 01:37:4068

    Here is 6 zone alarm independent circuit. this circuit suitable for a small office or home environment, it can also be adapted to use a combination loc...

  • Single zone alarm circuit

    2016-02-20 01:23:4170

    This article describes a single-zone alarm circuit theory. I suggest you to understand the principle of combining circuit. The circuit features automat...

  • Auto Arming Car Alarm circuit

    2016-02-20 01:17:1567

    The car alarm here is a simple circuit with basic characteristics that cover all entrances at the car that has switches (doors etc).With one switch (ar...

  • Broken Charger Connection Alarm Circuit

    2016-02-20 01:15:5371

    Detects if a device is not properly connected to its supply Suitable for battery chargers, portable appliance supplies etc. The above circuit can be us...

  • How to build Fridge Door Alarm Schematic 2nd Version

    2016-02-20 01:06:3961

    Description The main purpose of this design was to obviate a small defect of the very popular Fridge Door Alarm circuit, available on this website sinc...

  • Easy-auto-alarm

    2016-02-20 00:52:4064

    Timing information alarm circuit by (a) (b) show. If you are using incandescent lamps instead of a resistor, youll get an extra feature, open enrollmen...

  • Timer with alarm

    2016-02-20 00:42:1567

    The circuit has two ranges: 10 sees to 5 mins and 1 min to 80 mins. It can be powered by a 9-V battery. With the LED connected as shown a reasonable fr...

  • How to build Audible Flasher Warning

    2016-02-20 00:39:0765

    Description If you’re a biker or scooter rider you’ll know how easy it is to forget to cancel your flashing indicators after turning without an aud...

  • The Old-Fashioned Nixie Clock Can Be Stylish Too

    2016-02-20 00:37:2467

    The Nixie Tube is an electronic device and its main purpose is to displaying numbers. Most of the time, the tube is normally filled with neon with a li...

  • On/off tone for printer error alarm circuit

    2016-02-20 00:08:3264

    When a printer error occurs, the Alarm lamp flashes orange as shown below. The number of flashes indicates the type of error that has occurred. Count t...

  • Car Anti-Theft Wireless Alarm

    2016-02-20 00:05:5486

    This alarm circuit is an anti- theft wireless alarm can be used with any vehicle having 6- to 12-volt DC supply system. The mini VHF FM radio-controlle...

  • Tone-alert decoder

    2016-02-19 23:53:0762

    PLL (Ul) is set with R2 to desired tone frequency. LED lights to indicate lock-up of PLL. Reduce signal level (Rl) and readjust R2 to assure lock-up. D...

  • Building A Synchronous Clock(4093 )

    2016-02-19 23:45:4573

    This article briefly describes the Building A Synchronous Clock (4093). This principle is easy to understand, but also very practical. Depth understand...

  • Proximity alarm

    2016-02-19 22:50:0566

    Inverters Ula and Ulb are connected in a simple RC oscillator circuit. The frequency is determined by the values of Rl, Cl, C2; and the internal charac...

  • Polyphonic DoorBell(UM3481)

    2016-02-19 22:31:10116

    This article briefly describes the Polyphonic DoorBell (UM3481). This principle is easy to understand, but also very practical. Depth understanding of ...

  • Wire loop alarm circuit

    2016-02-19 22:18:2663

    This article describes a wire loop alarm circuit theory. For your better understanding in the diagram, we recommend that you look at the text. This cir...

  • Gas Leakage Alarm(SL100)

    2016-02-19 22:13:2969

    This article briefly describes the Gas Leakage Alarm (SL100). This principle is easy to understand, but also very practical. Depth understanding of cir...

  • rf alarm CIRCUIT (MC14093BC)

    2016-02-19 21:49:5171

    This simple circuit is sure to have the police beating a path to your door however, it has the added advantage of alerting you to their presence even b...

  • Rain alarm circuit

    2016-02-19 21:17:5069

    Description. Here is a simple rain alarm circuit that produces an audible alarm when ever rain falls. The rain detector circuit is based on two transis...

  • Alarm 5 zone Circuit using CMOS IC

    2016-02-19 21:01:5067

    Here is alarm 5 zone circuit. This is a complete alarm system with 5 independent zones suitable for a small office or home environment. It uses just 3 ...

  • Clock Input Frequency Divider

    2016-02-19 20:12:0162

    1. THE INPUT CLOCK frequency fed into this circuit is divided by 2n-l. The circuit consists of clocked flip- flops and one exclusive-OR gate. The dt de...

  • Audible Flasher Warning(BC327)

    2016-02-19 20:08:1873

    This article briefly describes the Audible Flasher Warning (BC327). This principle is easy to understand, but also very practical. Depth understanding ...

  • Motorcycle Low Voltage Warning Used 2N3906

    2016-02-19 19:36:4462

    Parts List:U1 = LM339, Op-Amp Q1 =2N3906, PNP transistor. D1,D2 = 1N4148, signal diode ZD1 = 1N5235, 6.8V zener diode R1 = 1K R2 = 10K, trim pot R3,R5 ...

  • Wailing Alarm Siren

    2016-02-19 19:23:1968

    This alarm siren circuit produce warbling sound, you can use it in your toys or? in security alarm.? The circuit use two 555 IC oscillator. In this ala...

  • Photodiode Alarm circuit

    2016-02-19 18:55:3872

    ThisPhotodiodebased Alarm can be used to give a warning alarm when someone passes through a protected area. The circuit is kept standby through a laser...

  • How to build Broken Charger Connection Alarm Circuit

    2016-02-19 18:47:2061

    Description The above circuit can be useful to detect if the load of any battery charger or plug-in adapter supply is not properly connected. The load ...

  • How to build Fridge door Alarm

    2016-02-19 18:33:1863

    Beeps if you leave open the door over 20 seconds 3V battery operation, simple circuitry Circuit diagram: Parts: R1 10K 1/4W ResistorR2 Photo resistor (...

  • Multitone Siren Alarm circuit diagram

    2016-02-19 18:25:5067

    Here the simple schematic of multitone siren alarm circuit. This multitone siren is effective for reverse horns, burlgar alarms, and many others. It ge...

  • Doorbell Memory Circuit Diagram

    2016-02-19 18:24:3661

    If youre expecting an important visitor but you just have to step out for a moment, an electronic doorbell memory can come in handy so you can see whet...

  • Run-Down Clock/Sound Generator

    2016-02-19 18:02:0863

    Used in electronic roulette or dice games, this circuit produces a clock signal that initially is several te ns of kHz (depending on C2) and gradually ...

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