Domestic Seismic Alarm
When the switch is on, the seismic alarm isin detection condition. When there is no earthquake, IC1`s pin 3 outputs low level and VT is disconnected. The alarm ...
Car alarm circuit diagram
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Car alarm circuit diagram
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Infrared sensing automatic door control circuit diagram with KC778B
The circuit is shown as the chart. It is a control circuit which composed of infrared specific integrated circuit KC778B and KC778B is the center of the circuit...
Infrared sensing automatic door control circuit diagram with KC778B
The circuit is shown as the chart. It is a control circuit which composed of infrared specific integrated circuit KC778B and KC778B is the center of the circuit...
Water sensor alarm
This small water sensor alarm circuit makes a loud warning sound when a humidity sensor detects a quantity of water. This circuit assembly is an application of ...
Water sensor alarm
This small water sensor alarm circuit makes a loud warning sound when a humidity sensor detects a quantity of water. This circuit assembly is an application of ...
Triac gas - smoke alarm circuit schematic
In the event of combustible gas, the conductance of TGS308 gas sensor increases, and the voltage is removed through the potentiometer RP1 slide point, and its v...
Triac gas - smoke alarm circuit schematic
In the event of combustible gas, the conductance of TGS308 gas sensor increases, and the voltage is removed through the potentiometer RP1 slide point, and its v...
The alarm circuit diagram for safety box and other metal objects
When someone touches the safety box or other protected metal objects, in order to get the photo of the toucher, the sensor circuit inputs a pulse to the alarm c...
The alarm circuit diagram for safety box and other metal objects
When someone touches the safety box or other protected metal objects, in order to get the photo of the toucher, the sensor circuit inputs a pulse to the alarm c...
Infrared burglar alarm circuit schematic
Infrared burglar alarm circuit schematic is shown in Figure 1. Infrared transmitter is a multivibrator with oscillation frequency being 40kHz, and it is compose...
Infrared burglar alarm circuit schematic
Infrared burglar alarm circuit schematic is shown in Figure 1. Infrared transmitter is a multivibrator with oscillation frequency being 40kHz, and it is compose...
Human infrared thermal release alarm
Human infrared thermal release alarm can receive the heat releasing infrared ray issued by the body during the day or night, then it willgive the sound and ligh...
Human infrared thermal release alarm
Human infrared thermal release alarm can receive the heat releasing infrared ray issued by the body during the day or night, then it willgive the sound and ligh...
House Alarm Loop
This circuit offers open and closed loop contacts (switches 1,2,3) that triggers the alarm ON and stays ON for 5 -10 minutes. The trigering delay (entrance/exit...
House Alarm Loop
This circuit offers open and closed loop contacts (switches 1,2,3) that triggers the alarm ON and stays ON for 5 -10 minutes. The trigering delay (entrance/exit...
HORN CIRCUIT_FOR_MOTORCYCLE_USE
Gates U1-a and U1-b of the 4093 quad 2-tnput NAND Schmitt trigger are connected in variable, low-frequency, square-wave oscillator circuits. The output of gate ...
HORN CIRCUIT_FOR_MOTORCYCLE_USE
Gates U1-a and U1-b of the 4093 quad 2-tnput NAND Schmitt trigger are connected in variable, low-frequency, square-wave oscillator circuits. The output of gate ...
Cashbox or Locker Alarm
The locker alarm circuit or cashbox watcher can be used to protect a cashbox/locker from unauthorised access. This tried and tested design forms a fool-proof,re...