|
|
Hour Meters
The contents & graphics of Discovercircuits.com are copyrighted.
LINKING to Dave's circuits is permitted
but DO NOT COPY this data to your WEB SITE server.
Click on Drawing Below to view PDF version of Schematic |
|
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 |
|
|
|
|
Hour Meters
Master Schematic Category List - David A. Johnson, P.E. |
|
|
|
|
