with piezo Seismic detector circuit

The piezoelectric part of a kitchen gas lighter has used this easy, nonetheless effective seismic detector. The piezo part should be mounted vertically, one finish firmly to the bottom. A weight of 2 to a few pounds of fine gravel in a very bulk packaging placed higher than the opposite facet. The high voltage wire planning to the ICU, close to the piezoelectric part. the whole box is acoustic and electromagnetic screening. A 3-shielded cable brings the signal to the remainder of the circuit and power (+ / – 15V). SB140 Schottky diodes are the kind and pin eight (substrate) of the CI should be grounded.