Top Circuits Page 39
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The circuit has a built-in, self-arming feature. The driver turns off the ignition, presses the arm button on theComputalarm, and leaves the car. Within 20 seconds, the alarm arms itself—all automatically! The circuit will then detect the opening of any....
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The circuit shown is the second natural gas (gas) stove flame alarm. After the gas stove ignited normal combustion, close the power switch S. Photoresistor RG due..
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When the alarm protection can be higher or lower than the predetermined value in the mains voltage, sound and light alarm,..
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Circuit operation principle of the device shown in Figure 13. When the barbed wire Fe intact, LSE's O, feet collusion between its pin output high,..
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Circuit works: This is an AC blown fuse alarm. When BX is not when blown, 220 V AC voltage through a VD1 VD4 bridge rectifier, R1 limiting buck, after DW 6V DC..
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The alarm circuit shown: alt="Menci alarm produced schematic circuit diagram"> Turn the power switch SW1, alarm electrical work...
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FIG. 1 is a circuit diagram of it, it is in the audio circuit from the resistance between the two leads to a probe to rain alarm. Fig. 2 with CCL to make a probe connected to t..
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Explanation Here is a simple fire alarm circuit based on an LDR fire detection sensor. Smoke generated during circuit generates an audible alarm, fire smoke in case of fire. Al..
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Door alarm here with a time recognition, the owner opened the door is normally open the door, open the door to complete the action within the general 30s, so it does not alarm,..
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11A by the component and other components RMIB multivibrator, when the old man lost not more than a certain distance, the receiver output pin output low, the time-base integrat..
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Ding for the circuit principle: care, vs SCR trigger grounded, it is in the off state. When someone leads A burglar broke, the SCR trigger end to give a trigger voltage is turn..
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Change the value Ri, R2, Cl, C3, can change the alarm tone. It uses KD9300 music integrated circuits...
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Circuit works: When the patient usually upright, packed in kit SQ mercury switch was turned off,..
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Circuit operation principle of the device shown in Figure. When the barbed wire Fe intact, LSE's O, feet collusion between its pin output high,..
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High pressure alarm High sensitivity, high-voltage electric energy in the body from lOkV 2m at or away from the low-voltage mains (AC 220v) 0.3m at the alarm device yuan less device, the circuit is simple, easy to manufacture, small in size, easy to use...
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This is a two-way can set the alarm circuit which uses a Schmitt IC, with responsive and sound and light show, small size, low power consumption, all of the elements is only 13, a very low cost. This circuit is divided into two parts by the A, B and R4,..
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Phone alarm device can monitor and prevent unlawful misappropriation of your telephone line. When someone in your telephone line and the machine thefts from outside the alarm on the issue of interference signals, so thieves can not dial, and the light was....
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It uses a negative temperature coefficient thermistor for temperature sensing element Rt. By the resistor Ri, Rs, , potentiometer RP and thermistor R. Composition temperature bridge; by the transistor VTi, VT2 constituting the differential amplifier; by the....
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As shown in manpower inductive alarm circuit, simple and practical, when a person's hand near the sensing line, the alarm will send out alarm sound, which is very suitable for the male electrical burglar alarm. Induction line L is a long lo ~ 50cm of wire,..
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It shows an automatic unattended burglar alarm circuit, mainly for family night, warehouses and other occasions automatic unattended. The circuit consists of pyroelectric infrared sensor light control circuit..
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When the water boils, it is not only the police, but also cut off the heater power. Temperature sensing element with a fluorescent neon light bulb restructuring within the starter...
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It uses KD153 type "ding-dong" music IC, issued a "ding-dong" sound alarm. d = 221611 " There /dianlu/safe/201303/160666.htm" refrigerator door alarm circuit...
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By the 555 IC A composed of a non-steady-state self-excited multivibrator. When the sensor very close to the high-voltage electrified body, the piezoelectric ceramic sheet B out alarm. When it is close to the frequency electric field, cricket issue vibrato;....
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Circuit works: When the gas sensor MQK-2 surface adsorption or smoke when combustible gas, which inter-electrode resistance BL plummeted, this time by the Rp2, R1 and BL electric poles between resistance partial pressure node C potential drop, when it fell....
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After the gas stove ignition, closing switch S, the circuit is in working condition. Phototransistor VT1 by flame before irradiation, low resistance state, the transistor VT2: saturated conduction, VT3 and integrated sheet music collector connected to..
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This is the over-temperature alarm and a cooling by the CD4011 four NAND gate integrated circuits, and for monitoring the temperature of the oven used. When the thermostat circuit failure or power outage, the inside temperature is above or below the allowed..
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It uses the HL-169B-type voice alarm IC A. It can be used for safe, glass doors, car doors and windows burglar alarm and other occasions. When the thieves beat with violence such items that vibration of the piezoelectric ceramic sheet A, crystal thyristor V..
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SOS Alarm centralized control circuit can be used to call a hospital bed, can also be used in multi-storey buildings, dormitories, warehouses and other places of anti-theft alarm. The circuit shown in Figure l3-64. The circuit shown in three-channel..
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It uses reed KR V control thyristor conduction, with 555 integrated circuit path consisting multivibrator as an alarm generator. When the door is closed, the permanent magnet close to the reed switch KR, with normally closed contacts reed contacts open,..
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The double-limit temperature alarm circuit by the temperature detection control circuit, the temperature indicating circuit and sound the alarm circuit, as shown in FIG. Components Selection R1 ~ R5 use 1 / 4W metal film resistor or a carbon film resistors. ..
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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 have no bias current and be fully off. However as the probes get wet the transistor will conduct and....
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A capacitor Cl and resistor Ri-R3 consisting negative sequence voltage filtration device. Resistors and capacitors to meet the following requirements: Ri Ra-Rz 5.5/C1 (KN) form..
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A simple burglar alarm circuits, sensors pyroelectric sensor IRA-E100SZI. When human movement is detected, the pressure on the electric buzzer alarm whistle. Sensor receives si..
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Alarm interface circuitry. As shown, the two-color light-emitting diode display. When LAi is high level t and LBi is low, the green light-emitting diode display; on the contrar..
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As environmental awareness increases, the electric car has been poured into our family, become an indispensable part of peoples transport. How to prevent the electric car theft..
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As shown in (a), KAi, KA2, KA3 intermediate relay, connected to the outlet end of the low-voltage circuit breakers total. Alarm circuit connected to the backup power supply or ..
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As shown in FIG alcohol detection alarm controller circuit. QM-NJ9 for alcohol gas sensors, if detected the odor of alcohol, the AB-QM-NJ9 between resistance becomes smaller, t..
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As shown in FIG hydraulic oil for automotive LED alarm circuit. The circuit consists of a light emitting diode driver SL322C (IC), integrated voltage regulator circuit CW7809 (..
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As shown in FIG measuring temperature alarm circuit to the Treasury. The device consists of inverting amplifier IC1, comparison amplifier IC2, low-frequency multivibrator IC3, ..
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As shown in FIG weak light alarm circuit. The core of the oscillator circuit for the alarm SCZ07. Its input signal by the potentiometer W, control, output signal photoresistor ..
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As shown in the simplified block diagram of the high sensitivity of the alarm circuit, wherein the photoresistor LDR and three ordinary resistor connected. Thus, when the light..
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As we all know, if the elevator power suddenly fails, the distance distribution room duty officer is not immediately found, this time, the crew was on the elevator might panic...
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As we all know, if the power transformer neutral line circuit, and when the three-phase unbalanced load and can easily lead to electrical equipment (such as household appliance..
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Automatic alarm circuit includes a DTMF Automatic dialing, password control circuit, voice detection and alarm circuit, telephone interface circuit, power supply circuit and th..
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CD4538 is using DIP-16 and SMD-16 packages precision monoflop. With stable performance, fewer required external components, the logic function is strong, the chip integrates tw..
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Children lost a phenomenon often happens, look around, the family should not have brought enormous suffering and economic losses; in addition, also points to unscrupulous child..
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Circuit as shown by the triggering device, monostable delay circuit, the alarm sound generator, audio amplifier circuit, light control circuit, partially blocking the preset ci..
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Circuit for the principle: The alarm circuit consists of two parts, the transmitter and receiver. Figure a shows the transmitter circuit, GT is a smoke break reed switch, usual..
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Circuit inductive burglar alarm circuit from the radio scanning detection circuit, a signal processing circuit and alarm circuit, as shown in Figure 13-43. Radar detected by th..
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Circuit operation principle of the device shown in Fig. Shaped permanent magnet mounted on the door ZT activity, normally closed reed AG mounted on the door frame. Usually ZT c..
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Circuit schematic shown in Figure 1.SCR, R1 and AN SCR trigger switch circuit composed; IC1, R2, VT1, VT2 and BL siren composed of analog circuits. Usually, AN oppression by ho..
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4 ~ 20mA current transmitter circuit from the MAX1459 configured as shown in FIG. The PGA output voltage supplied to the spare amplifier chip, and then through an external powe..
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Conventional digital home theater amplifier requires the use of a dedicated integrated circuit, and such a small integrated circuit manufacturers, the price is higher. This cir..
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Circuit constituted by the MAX1494 digital strain gauge shown in Figure 5-31. See the bridge by the resistance strain gages, temperature compensation sheet..
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Digital precision pressure tester circuit shown in Fig. MAX1457 external ROM selection 93C66 type 4096b E2PROM. After power MCS end is pulled to a high level, check the main ch..
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Digital pressure measuring circuit AD7710/7715/7730 multifunction digital sensor signal conditioning ICs. They integrate a digital interface with the control port, a clock gene..
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Digital pulse width measurement circuit is shown. It uses a l00kHz reference frequency, the count in the pulse width of the signal, the count value of the product of the resolu..
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Digital integrated circuit enables the answer is greatly simplified. The picture shows four Responder group circuit. ..
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Dien stone crystal oscillation circuit CM OS inverting clamor ways to ensure work as accurate because it uses a BCD counter Wong (IC2, hi) so maximum oscillation frequency equa..
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Shown for the precision digital timing control circuit. The controller consists of crystal oscillator circuit, a divider, counting circuit, monostable flip-flops...
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AC has been shown as a fishing converter input circuit ND conversion Tiger Road. In order to check the AC signal and I was shown, it is provided in the input circuit AC DC conv..
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AD7710/7715/7730 multifunction digital sensor signal conditioning ICs. They integrate a digital interface with the control port, a clock generator, a digital filter, A/modulati..
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After the SCM execution, Pl output port to bidirectional input 74LS245 driver chips, the same driver each phase of the digital control, according to the information Pl port out..
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Automatic inspection circuit for multiple detection and control of production equipment, the inspection circuit may sixteen regular inspection of production equipment. It consi..
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Automotive engine pulse points or other sensors to be filtered in the transmission device 3130 CMOS op amp, the op amp is used as a comparator to complete the input conditions...
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Bridge the digital pressure signal conditioner MAX1458 excitation circuit is shown. Using the output DAC3 to change the size of the sensor excitation current IBR, you can achie..
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Figure 4-14 is a digital integrated circuit consisting of 16 preset potentiometers Siniperca electronic circuits. It consists of three parts: input into the controller. Presett..
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Figure 4-18 by volume potentiometer T (Xi 153AP and tone potentiometer T ( 155AP consisting of volume, tone control circuit circuit, Rx, cx clock oscillation element, the value..
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450/800Hz oscillation circuit shown in FIG oscillator is a transformer coupling. The frequency conversion is made different inductance is achieved by changing the oscillation t..
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2SA130 transistor shown oscillator, the oscillation frequency of 7 MHz, the power supply voltage is 6V, frequency-selective resonant circuit load 600 Q. ..
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The local oscillator at 1GHz or more to use more common collector circuit, it is not easy to produce low-frequency self-oscillation...
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1kHz RC phase shift oscillator circuit ..
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Crystal frequency stabilization of frequency modulation circuit is shown below: ..
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Crossing various sawtooth voltage generator, the common denominator is the use of a capacitor charge. Discharge effect to generate a sawtooth voltage of the forward and inverse..
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Low phase noise voltage controlled oscillator circuit a It shows a typical low phase noise voltage controlled oscillator circuit, which..
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Fig variable frequency oscillator transistor circuit, which is mainly an oscillator, the crystal resonator and varactor circuit by the transistor diode, the output of the ampli..
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Field scanning circuit circuit and sawtooth waveforms Sawtooth signal generating circuit color television field scan is an indispensable circuit shown in Figure 1 is a Toshiba ..
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Field effect transistor amplifier has fixed bias input source with feedback. Therefore, the input impedance is very high and very low capacitance. Drive a field effect transist..
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Feedback oscillator circuit inductance shown, transistor 3DG3. Component Parameters Reference values are as follows: 1) transistors 3DG6. 2) Resistance: Rhl 91kfl, RBZ llkfl, R..
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The normal assumption is that the phase shift sections are independent of each other. Then using above Equation the loop phase shift is –1800, when the phase shift of each section is 600. This occurs when ω=2πf = 1.732/RC because the tangent of 600 =....
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Using two operator triangular wave oscillator A practical application of the relaxation oscillator using a voltage comparator to perform the switching function, FIG. 2 is the use of composition operator triangular wave oscillator...
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B sawtooth voltage controlled oscillator First, the output voltage of the comparator is a negative potential maximum. Then the output to the inverting input terminal..
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Timing IC using long RS6445C constitute blocking oscillator As shown in the timing for the introduction of integrated long RS6445C constitute a blocking oscillator. WI and W2 segmentation is used to adjust working time and closed for the time, both of which ..
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A sense of three-point oscillator, also known as Hartley oscillator, the Colpitts oscillator with similar, but the feedback circuit is composed of two series inductor and a shu..
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Adjustable pulse generator circuit Shows an adjustable pulse generator circuit, which is a periodic signal and the pulse width can be adjusted independently of each other and t..
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Application circuit is shown in a complementary sawtooth generator. In the figure, the horse is VT1 base current limiting resistor, the conduction time to prevent excessive bas..
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As shown by the 12kHz 12kHz IF oscillator quartz oscillator, the output level adjustment, level-up circuit and alarm circuit components. It uses a novel single-tuned variable f..
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As shown by the triangular wave circuit composed of two OP, R62 is OFFSET adjustment, R27 for the adjustment of the peak, with the switch to select different resistance obtaine..
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As shown for the excellent performance of the low frequency signal generating circuit. The characteristics of this circuit is leveled good performance, high output power, wavef..
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As shown for the simple high-frequency signal generator. Change the LC resonant circuit inductance with the band switch Sl, you can change the high-frequency oscillation freque..
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As shown in FIG variety of low-frequency waveform generating circuit. The circuit can simultaneously output two waveforms that triangle and square waves. Circuit, a first integ..
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As shown in FIG, VT1 ~ VT11 base bias circuit 11 added to the binary data (high level 1 to low level 0 ), there are 211 2048 combinations. When a bit is low, the corresponding ..
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As shown in the Colpitts oscillator based on the deformed oscillator basis is formed by an oscillator Clapp, Colpitts oscillator with the fundamental differences between the re..
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As shown in the high-frequency signal generator capable of generating a low frequency 1kHz, 465kHz IF signal and the high frequency of 525 ~ 1605kHz, to repair radios or other ..
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As shown in the series resonant circuit using a crystal oscillator. Crystal impedance has a minimum value in the series resonance frequency, thus providing a large feedback amo..
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Audio function generator integrated circuit ICL8038 composition can produce a square wave, triangle wave and sine wave, as shown in Figure 11-8. Electrical resistance and poten..
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Base frequency selection, frequency-selective emitter type transformer coupled oscillator circuit ..
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Birds singing analog signal generator circuit Shown is an analog chirp signal generator circuit. The inverter circuit consists of six CD4069 composed of three oscillators, two ..
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By the 555 IC Ai, capacitors Cl, Cz and metal plate (tablet) M distributed capacitance Co and resistor Ri to ground, R2 consisting self-excited multivibrator; the R3-Rs and C3 ..
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Circuit as shown by the double oscillator is keyed monoflop CC4098, Quad 2-input NAND gate CC4011 and other composition. The circuit is the frequency and duty cycle adjustable ..