Homemade simple earthquake alarm device ----- Earthquake alarm

Homemade simple earthquake alarm device, Earthquake alarm Keywords: homemade simple earthquake alarm device Homemade simple earthquake alarm device This earthquake alarm device is simple and easy to produce, the sensitivity is high, and there will be analog machine guns, the sclerosis, the ambulance car and the fire trip are alarm, and the sound is simultaneously alarm. I. Working principle As shown in Figure 1, the circuit is shown in Figure 2. When the detection switch S detects an earthquake, the weight is deviated, turned on with the inner wall of the metal, and the DC4.5V power source is turned on, powered to the IC and the LED LED, LED LED , IC work, after the triode VT is enlarged by the speaker, remind everyone to quickly escape. Different picks of music ICs can produce four different sounds, which can be set according to their own favorite. Second, component selection and production Music Integrated Circuit IC KD9561 uses a soft packaging package, SEL1 and SEL2 are two selected ends. When the SEL1 is powered by the power supply positive (VDD), when SEL2 is suspended, the music IC issues a siren; when SEL1, SEL2 picks up the VSS power supply negative electrode; when SEL1 is suspended, SEL2 is connected to VDD and VSS, will send a machine gun separately Acoustic and fire tricks. The LED preferably uses high brightness red light-emitting diode to make its eye-catching point. One-way thyristor can be used with any model of 1A / 200V. The AN is a normally closed button switch to remove the earthquake alert to press it. The fabrication of the detection switch is the key to the success of this circuit. The specific size is shown in Figure 2, and the A end is hung on the upper bracket, such as a fixed ceiling, and the like. The B-terminal is fixed to the table or the like placement of the device. The contact spacing of the inner wall of the heavy hammer and the metal barrel is generally 1.5mm to 2.5 mm, the smaller the spacing, the higher the sensitivity. Of course, if there is no suitable metal barrel, metal ring can be used. When the circuit is soldered, since the IC is a CMOS device, the soldering iron housing must be well grounded or unplugged down the electric iron power supply, and the welding time is short to prevent damage to the IC internal circuit. After the circuit welding is completed, the check is correct and can work properly without debugging. Zhong Wujun

Our other product:

Professional lightning protection system for Tower	Professional FM Radio Station Equipment Package	FMUSER FU-1000C 1000W FM Transmitter With USB Audio Input Interface
FMUSER 200W FM Radio Broadcasting Package	Hotel IPTV Solution	FMUSER FSN-1000T V5.0 1KW FM Radio Broadcast Transmitter