Manpower sensing alarm circuit
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 i...
Over-temperature alarm circuit
It uses a negative temperature coefficient thermistor for temperature sensing element Rt. By the resistor Ri, Rs, , potentiometer RP and thermistor R. Compositi...
Telephone line burglar alarm circuit diagram
Phone alarm device can monitor and prevent unlawful misappropriation of your telephone line. When someone in your telephone line and the machine thefts from out...
Multi-way pocket alarm circuit
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 ele...
High pressure alarm circuit
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 de...
Infrared burglar alarm circuit
Infrared reflective burglar alarm, infrared detection using reflective components (maximum detection range of up to 12m) to trigger the alarm, when Pirates of t...
Electronic rodent control circuit
It is said that the mice are more sensitive to electromagnetic fields, which is why the high-voltage grid rodent generally poor results. Electronic rodent contr...
Undervoltage delay tripping a circuit
Undervoltage release is long-term work, when the power supply voltage drop in the operating voltage range when the release is released, and directly led to the ...
Low pressure break alarm circuit diagram
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,...
Secure lock circuit (CD4017) schematic
Circuit as shown by the two and four decimal counter CD4017 password switch composed by the output terminal of the key switch logic combination of components to...
Parking call alarm circuit
Circuit works: lC is a 555 IC. Incoming calls, 220 V electricity through R1 Buck, VD1 rectifier, DW regulator, C2 filtered to give 12 V DC voltage of about....
Gas stove flame alarm circuit
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 d...
Menci alarm produced schematic circuit diagram
The alarm circuit shown: alt="Menci alarm produced schematic circuit diagram"> Turn the power switch SW1, alarm electrical work....
Multi power failure alarm circuit
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...
Power disconnection alarm circuit diagram
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,...
Mains voltage bidirectional limit alarm protection circuit diagram
When the alarm protection can be higher or lower than the predetermined value in the mains voltage, sound and light alarm,...
Three water full alarm circuit
Change the value Ri, R2, Cl, C3, can change the alarm tone. It uses KD9300 music integrated circuits....
Three water full alarm circuit
Change the value Ri, R2, Cl, C3, can change the alarm tone. It uses KD9300 music integrated circuits....
Simple lock circuit can alarm
Circuit works: Figure 5 -2a in S. Alarm switch. If you press S, after the relay K. Electrical work, two normally open contacts Pull,...
Relay protection circuit
Operating power protection devices, there is a DC power supply operating power and AC operation into two categories. ...