Sensitive Vibration Alarm

Far left top is metal anchor clip to hold phosphor bronze wire and be one connection of vibration switch. A copper center clip helps reduce arcing at center when vibration bumps wire against center clip. So, SPST above amp meter is round metal with hole plus clearance for contact wire to hit against when vibrated. Amp meter (is fishing weight) and coil is stretched spring. This vibration sensing switch is mounted on Bakelite base. Adjust these components for desired sensitivity. If sparks from center contact ring is fire hazard enclose in case. Above the battery, is DPST switch. Operation on auto. Normal driving, DPST is open position. Turn on/ off auto lights with switch below and right of Push button switch. Push button switch is for car horn (top light with ground connection upside down). Car alarm mode. Stop car and let vibrations of body stop. Switch DPST switch on (close both switches in simulator). When car body vibrates motion sensor and makes contact with center contact (close switch above amp meter to send to car lights and horn until vibration stops).

published 10 years ago