Control Circuit

The 5G0602 special alarm integrated application circuit

Published:2011/7/6 9:30:00 Author:qqtang | Keyword: special alarm, application circuit

The 5G0602 special alarm integrated application circuitIn the figure, the sensor is a light sensitive tube, by replacing it with a thermistor, the circuit will be a temperature alarm circuit. In accordance with this law, 5G0602 can compose all kinds of alarms.   (View)

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The PIC single chip machine control burglarproof alarm circuit

Published:2011/7/6 4:30:00 Author:qqtang | Keyword: single chip machine, burglarproof alarm

ＶＤ５０２６, Ｔ４ and so on in Figure 1 compose the remote control emitting unit. One line of the 12V power supply is directly provided for the high-frequency emitting circuit, the other line gets a 5V or so voltage after the distribution of Ｄ１０ and Ｒ２４～Ｒ２７ when the keys of K1~K4 are pressed, and the voltage is then offered to VD5026 by D6~D9. When one of the emitting keys K1~K2 is pressed, the pin is outputting the encoding pulse bundle, which is launched by T4 after modulation(the frequency of the high-frequency oscillator composed of T4 is about 180MHz).   (View)

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The SX-6 human body inducting switch application circuit

Published:2011/7/6 3:03:00 Author:qqtang | Keyword: human body, inducting switch

In figure (a) is the radar alarm composed of the SX-6 human body inducting switch; In figure (b) is the radar alarm whose probe and host are divided; In figure (c) is the auto audio device composed of the SX-6 human body inducting switch; In figure (d) is the electric dog circuit composed of the SX-6 human body inducting switch; In figure (e) is the energy-saving auto switch circuit composed of the SX-6 human body inducting switch; In figure (f) is the fast reaction alarm composed of the SX-6 human body inducting switch.   (View)

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Zone Alarm System

Published:2011/7/6 1:22:00 Author:qqtang | Keyword: Alarm System

This is a complete alarm system with 5 independent zones suitable for a small office or home environment. It uses just 3 CMOS IC's and features a timed entry / exit zone, 4 immediate zones and a panic button. There are indicators for each zone a system armed indicator. The schematic is as follows:Each zone uses a normally closed contact. These can be micro switches or standard alarm contacts (usually reed switches). Zone 1 is a timed zone which must be used as the entry and exit point of the building. Zones 2 - 5 are immediate zones, which will trigger the alarm with no delay. Some RF immunity is provided for long wiring runs by the input capacitors, C1-C5. C7 and R14 also form a transient suppresser. The key switch acts as the Set/Unset and Reset switch. For good security this should be the metal type with a key. At switch on, C6 will charge via R11, this acts as the exit delay and is set to around 30 seconds. This can be altered by varying either C6 or R11. Once the timing period has elapsed, LED6 will light, meaning the system is armed. LED6 may be mounted externally (at the bell box for example) and provides visual indication that the system has set. Once set any contact that opens will trigger the alarm, including Zone 1. To prevent triggering the alarm on entry to the building, the concealed re-entry switch must be operated. This will discharge C6 and start the entry timer. The re-entry switch could be a concealed reed switch, located anywhere in a door frame, but invisible to the eye. The panic switch, when pressed, will trigger the alarm when set. Relay contacts RLA1 provide the latch, RLA2 operate the siren or buzzer.   (View)

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The simple leakage alarm circuit

Published:2011/7/6 9:54:00 Author:qqtang | Keyword: leakage alarm

Element selection and producingThe elements are chosen as the principle diagram While making it, we can choose a circuit according to the concrete condition, the 2 electrodes in the 2-hole outlet in the mixed outlet are cut off, so the circuit elements can be accommodated, and the installation is done in the room. After the installation, we can simulate the leakage dial with a 200Ω, one of whose terminals is connected with the power supply wire, while the other terminal is connected with the ground terminal, the circuit is only needed to work normally. In the figure, the withstand voltage of the diode should be higher than 400V, YD can be the Φ27mm, βof the transistor VT is ≥100, and the powers of all the resistors are 1/8W.   (View)

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The fire monitoring wireless alarm circuit

Published:2011/7/6 9:38:00 Author:qqtang | Keyword: fire monitoring, wireless alarm

(a) is the alarm emitting circuit; (b) is the alarm reception circuit.   (View)

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The limit temperature exceeding alarm

Published:2011/7/6 9:34:00 Author:qqtang | Keyword: limit temperature, exceeding alarm

(a) is the alarm emitting circuit; (b) is the alarm reception circuit.   (View)

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The domestic wireless burglarproof alarm circuit

Published:2011/7/6 9:04:00 Author:qqtang | Keyword: wireless burglarproof alarm

The circuit principle1. The invasion detector and micro alarm emitterIn figure 1 is the principle diagram of the invasion detector and the micro alarm emitter. The small magnet and the reed pipe E of normally closed contactor compose the invasion detector, the small magnet is fixed at the door leaf of the storeroom, the reed pipe E, which is close to the magnet, is installed on the corresponding door frame. Usually, the door is closed, as the magnet is close to E, so the 2 normally closed contators in E is switched off because of the external effect, and the micro emitter is not working without power.   (View)

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The language circuit of ND-1 vibration moving sensor

Published:2011/7/6 2:01:00 Author:qqtang | Keyword: language circuit, moving sensor

The circuit is shown in the figure, which consists of the vibration moving sensor, SCR light circuit, language sound making circuit, audio power amplifier circuit and AC step-down rectifier circuit,etc. It can be widely used in home burglarproof doors, safety boxes, vehicles, motorcycles, domestic appliances and so on. When the things are stolen or the windows/doors are pried, it will launch the sound of catch the thief . The IC is the ND-1 vibration moving sensor, which is full-direction sensing element mixing the vibration detection and the moving detection.   (View)

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The domestic burglarproof alarm

Published:2011/7/6 4:57:00 Author:qqtang | Keyword: domestic burglarproof alarm

Emitting circuit: Receiving circuit:   (View)

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The burglarproof alarm circuit

Published:2011/7/6 9:22:00 Author:qqtang | Keyword: burglarproof alarm

This circuit is used as the alarm of the vehicle and home, it is a dual time-based integrated circuit TDB0556, in which the first time-based circuit is a dual steady multiple oscillator, the circuit is getting into work after the switch S is pressed. Because of the voltage on the threshold input terminal 2, the output 5 is in a zero LEV. The second time-based circuit is in the output terminal locked state due to the zero state of 8-pin and 12-pin. The capacitor C1 is discharging. Once the door contactor or the briefcase contactor is closed, the alarm signal is emitted.   (View)

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The ultra-short wave package left reminding alarm circuit

Published:2011/7/6 2:14:00 Author:qqtang | Keyword: ultra-short wave, package left reminding alarm

The device consists of the emitter and receiver, which works in the FM wave. The principle of the emitter in shown in the figure, which is a multi-oscillator composed of the triodes (VT1 and VT3) and external components, the working frequency is 1000Hz, and the signal is picked out by C3, and modulated by the FM oscillator composed of VT3 and LC components, the modulated signal is output by C10, and emitted to the sky by the internal micro aerial, of which the function of C6 is to broaden the frequency band and avoid the human inducting effect on the frequency.   (View)

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The multi-functional portable dual-way alarm circuit

Published:2011/7/6 8:47:00 Author:qqtang | Keyword: multi-functional, portable, dual-way alarm

This circuit consists of two parts, the upper limit alarm function is composed of A, B, R4 and C1, and C, D, R5 and C2 form the lower limit alarm function, see as figure 1. Usually, there are two alarm spots, the upper and lower, which are fixed in RP1 and RP2 respectively, which make the input terminals of A and C both in a high LEV, and both of them output a low LEV so the oscillators stop. When it is too hot outside, the resistance of the thermistor is falling down, which makes A output a high LEV, B is starting to oscillate, and the piezoelectric pottery chip YD is generating the bumming sound of high frequency. At the same time, LED1 is glowing, indicating that the temperature is too high.   (View)

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The multi-functional remote alarm controller circuit

Published:2011/7/6 4:54:00 Author:qqtang | Keyword: multi-functional, remote, alarm controller

  (View)

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The electric lock circuit of Guanghua burglarproof door bell

Published:2011/7/6 10:01:00 Author:qqtang | Keyword: electric lock, door bell

See as the figure, the circuit consists of the door control magnetic switch, the relay control circuit, ding-dong door bell sound making circuit, the simulated police car sound circuit and so on. It can be the door bell, or used as the burglarproof alarm of pry.   (View)

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The light sensitive high power fire alarm circuit (LM1801)

Published:2011/7/6 10:09:00 Author:qqtang | Keyword: light sensitive, high power, fire alarm

See as the figure, the circuit consists of the light sensitive detecting bridge, the fog specialized control magnetic valve water spray circuit, the simulated sound and audio amplifier circuit, the AC step-down rectifier circuit and so on.   (View)

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The precious electric appliance burglarproof alarm circuit

Published:2011/7/6 10:24:00 Author:qqtang | Keyword: electric appliance, burglarproof alarm

The circuit principle is shown in figure 1. SCR, R1 and AN can compose the SCR trigger switch circuit; IC1, R2, VT1, VT2 and BL compose the analog alarm whistle circuit. Usually, AN is pressed by the domestic appliance, both of its normally open contactors are disconnected, SCR is blocked without trigger signal, the alarm is not working. When the appliance is moved, the contactors of AN are closed, the trigger terminal of SCR is getting the signal from the positive pole of the power supply with the help of R1, SCR is conducting, IC1 is getting power and working, and the output terminal is outputting a police whistle signal which is amplified by VT1 and VT2.   (View)

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The door bell circuit

Published:2011/7/6 0:58:00 Author:Borg | Keyword: door bell

Figure 1 represents a cheap and simple Gate Alarm, that is intended to run off a small universal AC-DC power supply. IC1a is a fast oscillator, and IC1b a slow oscillator, which are combined through IC1c to emit a high pip-pip-pip warning sound when a gate (or window, etc.) is opened. The circuit is intended not so much to sound like a siren or warning device, but rather to give the impression: You have been noticed. R1 and D1 may be omitted, and the value of R2 perhaps reduced, to make the Gate Alarm sound more like a warning device. VR1 adjusts the frequency of the sound emitted. IC1d is a timer which causes the Gate Alarm to emit some 20 to 30 further pips after the gate has been closed again, before it falls silent, as if to say: I'm more clever than a simple on-off device. Piezo disk S1 may be replaced with a LED if desired, the LED being wired in series with a 1K resistor. Figure 2 shows how an ordinary reed switch may be converted to close (a normally closed switch) when the gate is opened. A continuity tester makes the work easy. Note that many reed switches are delicate, and therefore wires which are soldered to the reed switch should not be flexed at all near the switch. Other types of switches, such as microswitches, may also be used.   (View)

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The motorcycle alarm circuit

Published:2011/7/6 0:57:00 Author:Borg | Keyword: motorcycle alarm

Any number of normally open switches may be used. Fit the mercury switches so that they close when the steering is moved or when the bike is lifted off its side-stand or pushed forward off its centre-stand. Use micro-switches to protect removable panels and the lids of panniers etc. While at least one switch remains closed, the siren will sound. About two minutes after the switches have been opened again, the alarm will reset. How long it takes to switch off depends on the characteristics of the actual components used. But, up to a point, you can adjust the time to suit your requirements by changing the value of C1.The circuit board and switches must be protected from the elements. Dampness or condensation will cause malfunction. Without its terminal blocks, the board is small. Ideally, you should try to find a siren with enough spare space inside to accommodate it. Fit a 1-amp in-line fuse close to the power source. This protects the wiring. Instead of using a key-switch you can use a hidden switch; or you could use the normally closed contacts of a small relay. Wire the relay coil so that it is energized while the ignition is on. Then every time you turn the ignition off, the alarm will set itself.When it's not sounding, the circuit uses virtually no current. This should make it useful in other circumstances. For example, powered by dry batteries and with the relay and siren voltages to suit, it could be fitted inside a computer or anything else that's in danger of being picked up and carried away. The low standby current and automatic reset means that for this sort of application an external on/off switch may not be necessary.   (View)

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The cupboard and drawer light penetration music calling circuit

Published:2011/7/6 5:04:00 Author:qqtang | Keyword: cupboard, drawer, light penetration

The figured circuit consists of the light sensor, electric switch circuit and music playing circuit, etc.when the cupboard or the drawer is opened by someone, the circuit will make sound which attracts the owner's attention.   (View)

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