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Sensors / Detectors: Vibration Monitors
Last Updated on: Tuesday, April 22, 2008 03:50 PM
Sensors / Detectors -- Main Page
Circuits Designed by Dave Johnson, P.E. :
  • Home Made Geophone Detects Foot Stomp
    A home made geophone is made from a strong magnet, a coil of wire and a rubber band. The circuit is sensitive enough to detect the vibrations of a nearby foot stomp.  It could be used as an earthquake detector. (added 7/06)
  • MACHINE VIBRATION TRIGGERS HOUR METER
    This circuit allows an off-the-shelf battery powered digital hour meter to be turned on and off, according to a machine's operation, without requiring a direct electrical connection to the machine. Machine vibrations are detected by an off-the-shelf piezoelectric wafer. The wafer is normally used as a sound generator. The 3v power could be tapped from the hour meter's own lithium battery or from a separate 3v lithium battery. The circuit only draws about 1.5uA, so a 250mA-hr battery would power the circuit for about 10 years. Published in EDN, Jan 16, 1997


Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Machine Vibration Activates Hour Meter:  01/16/97 EDN-Design Ideas  by David Johnson Battery-powered digital hour meters commonly monitor how long a machine is in operation by detecting when the machine is supplied with power. However, it is often difficult or dangerous to connect a battery-powered hour meter to a line-powered machine. When the machine being monitored produces de-tectable vibrations, you can use the circuit in Figure 1, which doesn't require any power-line connections. The circuit uses just one IC and allows you to turn a battery-powered hour meter on and off according to a machine's vibration.  (added 09/05)

Shock Sensor Circuit Prevents Data Corruption:  07/04/96 EDN-Design Ideas / (added 3/03)

 

Vibrato Effect:  (electronic circuit added 10/06)

 

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