Electronic Circuits and electronic circuits, electronic schematics plus an extensive resource for hobbyists, inventors and engineers

DiscoverCircuits.com, has 26,000+ electronic circuits or schematics carefully
cross-referenced into 500+ categories.   As a vital resource for engineers,
hobbyists, inventors & consultants, the site's collection of information
will help you find quick solutions to electronic design problems.

Web www.discovercircuits.com

HOME Schematics Discover Forum Hobby Corner Dave's Circuits Electronic Resources Our Book Corner Contact Info

Hour Meter Circuits
Designed by David A. Johnson, P.E.

Last Updated on: Monday, April 21, 2008 04:19 AM

Master Category List - Dave's Circuits
 
  • 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


More Hour Meter Circuits

Master Category List - Dave's Circuits
 

Copyright  2002 - 2008 David A. Johnson & Associates.  All Rights Reserved to the contents & graphics of Discovercircuits.com
Linking is welcomed but COPYING any content or graphics to your server is expressly prohibited.