Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM
Photocoupler
The key to this alarm circuit is the fabrication of the seismic sensor head. The smaller the interval between the tin-plated ball and the outer ring, the more uniform the sensitivity is, but the error will occur when it is too small. The metal wire of the suspended ball can use an alloy copper wire with a certain tensile strength or a cord for the earphone, and the wire length should not be less than 1 m.