Today, most owners of summer cottages and country houses want to feel safe. A high fence cannot always protect against unauthorized people entering the territory. In this case, they turn to the latest technologies, purchasing modern alarm devices that will help not only scare away uninvited guests, but also notify neighbors about an attempt to enter. Therefore, the simplest and most inexpensive solution may be a homemade siren (howler).
Details about the “Siren-howler” system
Basically, in such systems, infrared motion sensors and audible alarms of varying volume levels are installed. The main purpose of a siren is to scare away strangers with a sound signal. The most common and easiest to install are “howlers”, which are autonomous sound signals.
If you connect a GSM module to such a system, then when intrusion into a protected area is detected, the device will not only turn on the siren, but also send a corresponding message to the phone. A siren can be simply sound or light and sound. In the second case, not only will a loud signal be heard, but a powerful spotlight will also turn on, attracting the attention of surrounding people.
Table: advantages and disadvantages of an autonomous siren
Household sirens consist of the following elements:
- Reception and control device.
- Detectors that respond to emergency situations.
- Autonomous power supply.
- Signal device.
The howler siren is able to respond to:
- Traffic on the site.
- Opening or closing doors.
- Breaking glass.
- Hacking attempt.
- Heavy smoke, etc.
For small rooms, you can use one device, which is equipped with an IR motion sensor and a siren installed in one protective housing. The sound device is intended for installation both indoors and outdoors.
Description and principle of operation of the siren
A howler siren is a directional security alarm device.
Such devices produce a range of actions against attackers:
- Create maximum discomfort indoors and outdoors.
- They have a powerful psychological effect on people.
- They give a signal to others.
The Howler can, if necessary, connect to any security or fire protection system devices. Such devices operate according to one established system: when the detector is triggered, the relay comes into operation and closes the siren contacts.
There are two types of alarm systems :
By its design, the howler consists of a piezoceramic plate, which acts as a membrane that vibrates at the required frequency. The generating device on the microcircuit provides the required sound frequency. The sound pressure can rise to 120 decibels, which is above the pain threshold for the human ear.
The siren has a compact body and elegant appearance, but when the sensor is triggered, it provides a high level of sound, painful for people nearby.
The microchip installed in howlers operates in various modes:
- Gives a constant beep.
- Alternates sound and pause.
- Works in two-tone mode.
Basically, all household sirens have a voltage of 12 V. Being in “sleep” mode, such devices practically do not consume electricity, so one battery is enough for a long service life. The sound siren for outdoor use is manufactured in a shock-resistant plastic case, which reliably protects the device from external factors.
Today, sensors to which you can connect a howler siren are in great demand.
Factors for choosing an alarm system with a howler for a summer residence
- Sound volume. This is the main parameter of the siren, it is measured in decibels. The most powerful devices can create a sound pressure of 100 to 120 decibels, which corresponds to the roar of an airplane taking off. Since the volume of the siren decreases significantly as you move away from it, for large areas it is necessary to choose powerful sirens, such as the Ademco ES-58 (117 dB power) or PoliceCam SR02 (120 dB power).
Despite its small dimensions, the PoliceCam SR02 siren provides a high level of signal volume when triggered - Sound options. Sirens can generate a wide variety of signals. For example, the Secure Dog device, when the control detector is triggered, begins to emit a piercing bark, turning into the growl of a huge angry dog. Naturally, such a siren will have a huge psycho-emotional impact based on human fear.
- Availability of GSM module. Wired sirens with GSM modules allow you to control the system via mobile communications. An example of such a device is an inexpensive alarm system from the Xital brand. Thanks to the high level of compatibility, an external siren, as well as other autonomous sirens, can be integrated into the system without any problems. An additional advantage is the ability to remotely control gas boilers, electricity, water supply and other devices.
A wireless siren with a built-in GSM module will not only respond to any signal from connected sensors, but will also notify you of an incident on your mobile phone - Switching method. A wireless siren is an excellent choice for those who want to protect their property from outside intrusion and without spending additional money on installation work. It will be enough to buy a howler siren, which, if necessary, your neighbors can turn off themselves. Such devices do not require wiring. Alarms with radio control such as “Leader”, Crow, Falcon Eye, “Astra”, Visonic and others make it possible to independently turn off the siren from a distance of about 300 meters.
If you intend to install an alarm system with a large number of sensors, a wireless system will be preferable, since it will be possible to significantly save on wiring
What factors are most important?
Before installing a siren, it is very important to ensure that all its elements are hidden from prying eyes. Surprise is the main factor that will ensure the desired result. If the motion detector and the sounder are located in different places and are connected via wires, then a criminal can easily “defuse” the siren by determining its location. That is why systems that combine two devices in one housing - a motion sensor and an audible siren - are in great demand.
Together with the howler, a powerful spotlight can be used, which will cause fear in the intruder and notify surrounding people of the intrusion. An autonomous security system with a good siren and a powerful spotlight costs much less than an alarm system connected to the security service remote control.
If you use a powerful spotlight together with a siren, the effect of unexpected alarm activation will greatly increase
On the site of a private house, you can install several sirens so that the entire territory of the household is covered. The main thing is to regularly change batteries or rechargeable batteries. The largest discharge occurs when the siren is activated.
Types and models of alarm systems with siren
Currently, there are a large number of different sirens that produce sound alerts. The simplest option is an IR sensor detector that includes a howler.
The most in demand is a sound device with an additional motion sensor. Thanks to the built-in memory, it is possible to record any type of voice notification lasting about 10 seconds. If the sensor is triggered, the player enters operating mode and the recorded text is heard from the speakers. The message can be of any nature to scare away uninvited guests.
The information system has three modes:
- "Security" - the alarm turns on.
- "Informational" - When the motion sensor is triggered, a sound signal sounds.
- "Voice Recording" - a pre-recorded voice message is activated.
The most popular alarm devices
- The Sensor Alarm model is a wireless type sound alarm, which is a motion detector, which is combined in one device with an audible siren. There are 2 key fobs that operate remotely using AA batteries. The device has the following characteristics:
- The Secure Dog model is designed for installation in apartments. Equipped with a microwave motion detector, which detects the approach of a stranger. If the device is in security mode, the sensor is triggered and a dog barks are heard. Device characteristics:
- The MT-1020 model is a device that, when a motion detector is triggered, autonomously turns on an audio alert or issues a recorded message. Characteristics:
How to connect a siren at the dacha
Howler sirens are the simplest and most inexpensive sound alarms that operate autonomously and are installed by owners of dachas and country houses. A wireless system can be easily installed with your own hands, while a wired system will require some effort.
If you choose a wired system, then you need to be sure that there will always be an uninterrupted supply of electricity on the site. For outdoor installation, you must choose devices in a durable, moisture-resistant case that can withstand any atmospheric conditions.
A siren-based alarm system usually consists of:
- control panel with power supply;
- the siren itself;
- light indicator;
- battery;
- electronic keys;
- code reader;
- wires for connecting the system.
Connecting a wired alarm with a bellower
- We install a siren and a light detector (lamp) above the door. It is best to install all devices higher so that they can cover a larger observation area of the territory.
- We install motion detectors in the required places. It is best to install them above the entrance doors or under the ceiling in the corner of the room.
It is better to install motion sensors in places where they are difficult to immediately notice - We install the alarm control panel inside the house.
If the alarm system has a separate control panel, it is better to install it at the front door to make it convenient to turn the system on and off - If necessary, we mount the sensor on the front door.
For security alarms, you can purchase door opening sensors that work on infrared rays or on a magnet - We lay wires from each sensor to the control panel. If you are not sure that you can connect all the cables yourself, then it is best to turn to professionals, since the service life of the entire system depends on the reliability of the connection of the wires.
The wires from all sensors must be brought into one place and connected to the appropriate connectors - Setting up motion sensors. To do this, we need to set them the desired direction and angle of inclination. We set a certain degree of sensitivity and operating modes.
- At the final stage, we program the alarm unit.
When programming the control unit, the main parameters of the system are set: names of protected zones, telephone number for sending alarm messages, siren operation time, etc.
We install an electronic key reader and program the keys. 
In order for owners to enter the premises, they must have special electronic keys
Video: wired GSM alarm
Connecting a wireless alarm with siren
For country houses and summer cottages, a wireless alarm system with a GSM module is the best option for protecting the territory and household property. Thanks to mobile communications, the owner of the dacha will always be informed about the events taking place on his site.
We will consider the features of installing a wireless alarm using the example of the “Guardian” system. This is a simple and convenient alarm system, which as standard is equipped with motion and door opening sensors. If additional security functions are required, you can purchase a smoke, gas or water leak sensor separately.
Wireless siren kit “Guardian”:
- Center console.
- Power supply.
- Additional backup battery.
- Key rings - 2 pcs.
- Opening sensor.
- Motion Sensor.
- Siren.
- USB cable.
Sequencing:
- We install the siren in any convenient place. It is best to install it in a hidden manner, otherwise a criminal may simply break it or remove the batteries.
The siren is the main warning element of the alarm system, so it must be securely hidden - We install the door opening sensor “Guardian M-401”. This is a simple device for wooden and metal-plastic doors. For metal doors you will need more powerful equipment. By design, the sensor has two elements: we attach the magnet to the opening part of the door or window, and the sensor itself to the stationary part. The reed element, thanks to the magnetic field, conducts a current that disappears when the contacts open. At this time the alarm goes off.
The door opening sensor consists of two elements, which, when removed from each other, generate an alarm signal - We install a motion sensor that will monitor the movement of strangers in the house. Such a device works by detecting a violation of the line of infrared rays that it generates. The sensor should be installed in places where it will be invisible and there will be no obstacles in its path (furniture, walls, glass and other interior items). It is best to place it at a height of 2 to 2.5 meters.
Wireless systems give complete freedom to choose the installation location of the equipment, so sensors can be mounted in the most inconspicuous places - We install a glass break detector “Guardian M-601”. Such a device is simply necessary in a private home, where you can easily access it through a window. The sensor is equipped with a special microphone that records sounds made by breaking glass.
- If necessary, we install a smoke detection sensor “Guardian M-501”, which detects smoke in the room using an infrared receiver. As a result, the siren also goes off.
- At the location of gas equipment (boiler, stove, heating radiators), we install Sentinel M-502 gas leak detectors. They can detect the presence of natural gas, as well as butane and propane, in the house.
- We install the central panel, which will control the entire alarm system, in any convenient location. Before this, insert a SIM card into it without any extraneous numbers and a request for a PIN code. Such a device will automatically communicate with the selected mobile operator in GSM mode.
- We connect backup (additional) power to the console from the battery so that in the event of a power outage, the alarm remains operational.
If the mains voltage disappears, the alarm will operate on battery power, and after the problems are resolved, it will automatically switch to normal power.
The siren can be controlled (armed or disarmed) by a regular free call from a specific owner number to the alarm number. If it receives an incoming call, the system will automatically change its state to the opposite. Thus, the owner of the house, leaving the territory, simply dials the system number and puts it under protection. You can also use SMS commands, and if you are near your home, use the remote control. In any case, before installing any type of wireless alarm system, you must carefully study the manufacturer's instructions to avoid unnecessary troubles.
The wireless key fob has several buttons that are necessary to set and disarm the alarm from the security function. Also on the key fob there is a button to turn on the alarm (lightning bolt icon) and a button to turn it off (crossed out lightning bolt).
The wireless key fob is the main alarm control and also allows you to force an alarm Video: autonomous wireless alarm system for home, cottage, garage
Is the use of a siren justified?
Many people become opponents of alarms with loud sirens, because, in their opinion, they disturb the peace of others. But experts believe that lighting devices alone will not be able to fully provide the necessary protection to remote objects, such as a dacha or a country house. They do not have the same psychological effect as sound sirens. Powerful sirens with sound annunciators deafen intruders who want to enter the territory of a summer cottage and force them to abandon their intentions.
I would also like to note that such a siren can provide not only protection from criminals. Very often, fires occur in dachas due to short circuits in old wiring, wooden buildings ignite due to various natural factors, etc. Triggering a howler siren will draw the attention of your neighbors and surrounding people to the fire, which will help prevent the inevitable loss of property.
Video: how to connect a howler siren at the dacha
Why the bell alarm doesn't work
The howler siren can sometimes fail for some reasons:
- The power was turned off while installing the wired system.
- The entire system was connected incorrectly.
- The batteries in the wireless device are dead.
- The alarm was installed on the street.
- Manufacturing defect.
- The attackers found a way to disable the siren.
- Water, dust, dirt got into the device and shorted the contacts.
When choosing any type of siren-howler alarm, you must carefully read the instructions in order to correctly install and configure the system. Otherwise, your home will not be reliably protected, and unforeseen situations may occur, for example, frequent false alarms. Thanks to the sound warning system, you can be sure that strangers will not enter the territory of your country house or cottage.
In today's article I want to talk about the air raid siren
The circuit is quite simple and will not be difficult to assemble
I came across a diagram of the Air Raid Siren from the site RadiKot.Ru
The circuit is cool and I decided to assemble it, but as you can see, in order to change the key, you need to press a button. I thought about how this could be automated, I thought about it and came up with it. Remember, I wrote about , and that’s what will work in this scheme. This is what I got now
Minimum details, maximum effect:
R1 = 68k
R2 = 51k
R3 = 22k
R4.5 = 10k
VT1= KT315
VT2= P217
VT3,4= S9014
The speaker used was 5 W 16 Ohm from a disassembled TV
I was pleased with the result, but the neighbors screamed for a long time afterwards. It's good that they don't know who did it. Good luck with the build
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A siren is used for sound notification of any process. As a rule, a siren is heard when an alarming event occurs, but radio amateurs use such sounds in various alarm devices. The tone and frequency of such a sound will force attackers to abandon their bad intentions.
By assembling the siren, we have another goal - to improve skills and experience in the development of electronic devices. Since this siren circuit is quite simple and even a novice radio amateur can do it, we will consider in detail the purpose of all elements of the circuit.
Siren circuit
The siren circuit consists of three, two, a speaker or loudspeaker and a 9 V power source, which can be a crown. The speaker is suitable for a power of up to one watt, with a resistance of 8 ohms.
How a siren works on two transistors
A latching button or small switch K1 supplies 9 V power to the circuit from the crown. The sound in the BA speaker occurs due to the flow of alternating voltage through its winding, which is generated using a generator built on transistors VT1 and VT2.
When you press the button K2 without latching, the power source begins to charge the capacitor C1 along the path through the resistor R1. As C1 charges, the potential at the base of VT1 increases and at a certain voltage value the transistor opens, and the sound in the speaker begins to gradually increase. The maximum volume of the siren is achieved when capacitor C1 is fully charged. The rise time of the sound is equal to the charging time of C1, that is, by its capacitance and the resistance of resistor R1.
When button K2 is released, the electrolytic capacitor begins to discharge, and the volume of the siren begins to decrease due to a decrease in the potential at the base of VT1. The discharge time of the capacitor, and accordingly the operating time of the siren, is determined by the capacitance C1, the resistance value of R2 and R3, as well as the resistance of the base-emitter pn junction VT1.
Ceramic capacitor C2 forms positive feedback between the two transistors. By changing the capacitance C2, you can change the tone of the siren on two transistors.
A simple two-tone siren circuit.
This two-tone siren circuit is simple, easily repeatable, and can be used to provide sound signals from any car security system. It is implemented using elements of domestic production and does not contain any deficiencies. The schematic diagram of the device is shown in the figure below:
The circuit is built on one logical chip K561LA7. The third and fourth elements form a symmetrical multivibrator, from the output of which the signal through the amplifier stage on transistor VT1 is supplied to the high-frequency head. The head can be used with a resistance of 2...8 Ohms. The frequency of the generated signal depends on the ratings of C4, R3 and C3, R4, and it is desirable that the rating of R3 be equal to the rating of R4. With the ratings of these elements indicated in the diagram, the generation frequency will be approximately 900 Hz.
A multivibrator is also assembled on the first two elements of the microcircuit, its frequency is 2 Hz. Thus, if there is a logical one at its output (pin 4 of the microcircuit), the second multivibrator will produce a signal with a frequency of 900 Hz. With a logical zero on the 4th leg of the microcircuit, the generation frequency will increase to approximately 1100...1200 Hz. As a last resort, if you don’t like the tone of the siren’s sound, play with the values of the above elements of the second multivibrator (which is at 900 Hz). The frequency of the first multivibrator depends on the ratings of C1 and R1.
The supply voltage of this circuit is limited by the maximum permissible parameters of the microcircuit, and, according to the technical specifications for K561LA7, can be in the range from 5 to 15 Volts, but keep in mind that as the supply voltage decreases, the volume of the siren will also decrease. When the supply voltage of the circuit is 12 Volts, the volume should be no less than that of a standard, for example, Zhigulevsky, car signal. The current consumption of the device when turned on is about 0.5 Ampere.
Just in case, we present the location of the pins of the K561LA7 microcircuit. Picture below:
Setting up the “Two-tone siren” circuit.
As we wrote above, the frequency of the main multivibrator is set by resistors R3 and R4, and if you practice with their values, remove one leg of the diode VD1 and make a selection. Then connect resistor R2 in parallel with R3, with the value of which select the desired frequency of the high-pitched sound of the siren. Solder the VD1 diode leg into place. By changing the value of resistor R1, you can select the desired frequency of changing the high and low tones of the siren. That's basically the whole setup. Otherwise, you don’t need to configure anything else, and if you didn’t mess anything up during assembly, it will work right away. We wish you success in repeating.
It would seem that to assemble a siren you would need to buy a microcircuit to provide the necessary signal amplification and install a body kit on it. However, to reproduce such a signal with low requirements for sound quality, you can easily get by by assembling a generator using transistors. The diagram is presented below.
Such an assembly provides a fairly loud sound and is quite suitable for a security alarm; naturally, the whole thing works from the on-board network.
The entire element base is common and can be found in any radio equipment store. The circuit is generally not very demanding on the element base; if any element is missing, you can replace it with any one you come across from old trash.
Another advantage of the circuit is that the transistors do not have to be installed on heat sinks; even during long-term operation they do not overheat.
In the diagram, the dash-and-dotted line indicates transistors, indicating two different generators, one serves to set the sound frequency, the other to change it, by selecting different types of transistors. The remaining components, resistors and diodes, I think will not be difficult to find. You can use any old alarm or buzzer as a head.
To increase the power, even from the diagram it is clear that you need to increase the power of the KT817 output transistor. For example, it can be replaced with KT819, however, when increasing the power, it is advisable to install the transistor on the heat sink, otherwise it will not last long.
You need to understand that for signaling it is not at all necessary to fence the low-impedance head, especially since it will heavily load the circuit. Therefore, it is advisable to use simple high-impedance heads (8-16 Ohms).
And I also want to note one point, if anyone has problems with the turbine, that is, it is incorrectly configured or something else, then there is an excellent company that does just that.
