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

DiscoverCircuits.com, has 27,000+ electronic circuits.  The electronic schematics
are 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 design ideas to electronic design problems.

Web www.discovercircuits.com
HOME Schematics Discover Forum Hobby Corner Dave's Circuits Electronic Resources Book Corner Contact Info

 

 

DiscoverCircuits.com  --   Hobby Corner
"Hobby Circuits for your Hobby Projects"
Last Updated on:  08/29/2008 02:09:04 PM

9v Battery Voltage Monitor
designed by David Johnson, P.E.
Nine voltage batteries are used in a wide variety of electronic devices.  But, you often don’t know when it is time to change the battery until the device stops operating.  The hobby circuit below provides a visual indication when the battery needs to be replaced.  It uses a neat IC from Linear Technology, which contains a very low power voltage reference and a voltage comparator.  The circuit is designed to turn on a LED indicator light when the battery voltage drops below 7.2 volts.

Click on Schematic below to view PDF version of this Circuit

Circuit 9V Battery Voltage Monitor Circuit uses a LTC1440 comparator designed by David Johnson, P.E. (June 30, 2006)

 About Us   |  Advertise on DiscoverCircuits.com   |   Report Broken Links  |    Link to DiscoverCircuits.com  |    Privacy Policy

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.