Water Activated Alarm circuit
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 ...
Double limit temperature alarm circuit
The double-limit temperature alarm circuit by the temperature detection control circuit, the temperature indicating circuit and sound the alarm circuit, as show...
Disconnect anti theft alarm circuit
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 pe...
SOS Alarm centralized control circuit
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 o...
Vibration burglar alarm circuit
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 ...
Over-temperature alarm and cooling circuit
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...
Natural gas stove flame alarm
After the gas stove ignition, closing switch S, the circuit is in working condition. Phototransistor VT1 by flame before irradiation, low resistance state, the ...
Mains under voltage voltage protection circuit
It can be used in refrigerators and other protection. It uses a 7815 three-terminal voltage regulator integrated fixed and Ai 555 IC Az (one-shot circuit for de...
Smoke alarm circuit
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, ...
JBD3-10 leakage protection circuit
JBD3-10 leakage protection circuit "0" cellpadding = "0" cellspacing = "2" method = "post" action = "/ e / search /...
Motorcycle anti-theft lock electronic circuit
Circuit works: lC1 is lock ASIC 5C058. Its 1-6 feet were even outside the key switch to the positive power supply, which is six valid key input, open lock A-F m...
One of the high-pressure sensing alarm circuit
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 ce...
Mains undervoltage overvoltage protection circuit
It uses a transistor control circuit. When the grid voltage is normal, relay KA pull, turn the power load. When the grid voltage is below the minimum allowable ...
Induction high pressure alarm circuit
It uses KD153 type "ding-dong" music IC, issued a "ding-dong" sound alarm. d = 221611 " There /dianlu/safe/201303/160666.htm" refr...
Water alarm circuit
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...
Cooker notification circuit
Rice cooked rice cooker notification circuit works: When the rice cooker to work, A, B both ends voltage is 0, the entire circuit does not work. When the rice c...
One infrared burglar alarm circuit
Infrared alarm system is the use of infrared LED emits invisible light, when the light is blocked by the body, namely the police. It consists of an infrared lig...
Automated Attendant burglar alarm circuit
It shows an automatic unattended burglar alarm circuit, mainly for family night, warehouses and other occasions automatic unattended. The circuit consists of py...
555 automatic power-protection circuit diagram
Shown automatic power-protection circuit. This protection consists of step-down rectifier circuit, overvoltage and undervoltage detection circuit, delay switch ...
Car anti-theft alarm circuit
This paragraph Easy Car Alarm circuit with the use of fewer components, easy to produce and so on. (1) circuit automobile anti-theft alarm circuit by the time b...