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Phase protective circuit of harmonic currents 2 b – Circuit Schematic
Phase protective circuit of harmonic currents 2 b
Both circuits are used to control the thyristor contactor KM action to overcome the break phase protection relay prone to malfunction or refuse to move, and en...
Gas flameout alarm circuit – Circuit Schematic
Gas flameout alarm circuit
Boil water or cook with gas stove, it is sometimes due to water spills extinguish the fire mission, if not found to cause a lot of gas bF overflow occurs risk ...
Open water notification Circuit Design – Circuit Schematic
Open water notification Circuit Design
Boil water on the kitchen gas stove, once the water is boiling, if not stalled, spilling boiling water will come out, the flame extinguished. Gas spills, very ...
Mains undervoltage overvoltage protection circuit of five – Circuit Schematic
Mains undervoltage overvoltage protection circuit of five
Bidirectional thyristor control. Adjust potentiometer RPi and RPz, you can change the lower and upper limit values. LEDs VLi and VL2 are less pressure and over...
Pyroelectric automatic door control circuit – Circuit Schematic
Pyroelectric automatic door control circuit
Automatic door control circuit diagram. Human motion detection using the new pyroelectric infrared detection module HN911. VT used as a delay control by adjust...
Intelligent fire alarm telephone alarm circuit - finger circuit – Circuit Schematic
Intelligent fire alarm telephone alarm circuit - finger circuit
Automatic alarm circuit includes a DTMF Automatic dialing, password control circuit, voice detection and alarm circuit, telephone interface circuit, power supp...
One of the three-phase AC power circuit neutral wire break alarm – Circuit Schematic
One of the three-phase AC power circuit neutral wire break alarm
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 ho...
Simple and practical circuit diagram of an elevator failure alarm – Circuit Schematic
Simple and practical circuit diagram of an elevator failure alarm
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 elev...
555 fall means a circuit diagram for help – Circuit Schematic
555 fall means a circuit diagram for help
As shown, the call falls by the position sensing circuit trigger control circuit and SOS alarm circuit. For critically ill patients or for help with a disabled...
555 car alarm circuit diagram – Circuit Schematic
555 car alarm circuit diagram
As shown is 555 more cars with alarm circuit, mainly consists of a 555 and a quad 2-input NAND gate circuit. At the time of low oil pressure and brake pressure...
High sensitivity alarm – Circuit Schematic
High sensitivity alarm
As shown in the simplified block diagram of the high sensitivity of the alarm circuit, wherein the photoresistor LDR and three ordinary resistor connected. Thu...
Super lock circuit diagram – Circuit Schematic
Super lock circuit diagram
As shown in the lock circuit by a decimal counter CD4017 composed by ten its output terminal is connected through a combination of the number of passwords the ...
Frequency electronic locks LM567 schematic – Circuit Schematic
Frequency electronic locks LM567 schematic
As shown in the frequency of electronic locks by the PLL audio decoder LM567 composition, the electronic lock circuit uses the LM567 audio decoding characteris...
Enhanced AE1169 made lock circuit diagram – Circuit Schematic
Enhanced AE1169 made lock circuit diagram
As shown in Figure is a circuit diagram of an enhanced lock the AE1169. AE1168 enhanced when the lock button is pressed, AE1168 through the keyboard scan to de...
Weak light alarm SCZ07 a circuit diagram – Circuit Schematic
Weak light alarm SCZ07 a circuit diagram
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 sign...
Medical call with lighting signal receiver circuit diagram – Circuit Schematic
Medical call with lighting signal receiver circuit diagram
As shown in FIG receiver may help patients avoid missing voice in the daytime, only the receiver itself is working, lights will automatically cut off part. At ...
Treasury temperature measurement alarm circuit diagram F007 5G1555 F033 – Circuit Schematic
Treasury temperature measurement alarm circuit diagram F007 5G1555 F033
As shown in FIG measuring temperature alarm circuit to the Treasury. The device consists of inverting amplifier IC1, comparison amplifier IC2, low-frequency mu...
The driver alcohol detection alarm controller circuit diagram – Circuit Schematic
The driver alcohol detection alarm controller circuit diagram
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 b...
Combustible gas alarm circuit diagram 2 7806 KD28 – Circuit Schematic
Combustible gas alarm circuit diagram 2 7806 KD28
As shown in FIG alarm by a gas-sensitive sensor element QM, buck rectifier and regulator circuits, integrated circuits KD28, speaker Y and other components. Ga...
Combustible gas alarm circuit diagram 7812 7805 555 – Circuit Schematic
Combustible gas alarm circuit diagram 7812 7805 555
As shown in FIG alarm by a buck rectifier and voltage regulator circuit, gas sensor, comparator circuit and sound the alarm circuit. Buck regulator circuit by ...