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

DiscoverCircuits.com, has 40,000+ electronic circuits, cross-referenced
into 500+ categories.    We have searched the web to help you find quick design ideas.
We make every effort to link to original material posted by the designer. 
Please let us if you would like us to link to or post your design.

HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches

DiscoverCircuits.com -- Hobby Corner
Last Updated on: Thursday, November 16, 2017 06:32 AM

Hobby Circuits List

The contents & graphics of Discovercircuits.com are copyright protected.
LINKING to Dave's circuits is permitted but DO NOT COPY any files to your WEB SITE server

More  Micro Power Circuits

Battery Eliminator -- April 5, 2009
 

If you use a 1.5v or a 3v battery powered MP3 player for long periods of time, you may get tired of constantly changing batteries. Some older players do not work will NiMH
rechargeable batteries so changing out batteries can get expensive.  The circuit below can be wired into the player, to replace of one or two AAA or AAA batteries.  I designed the circuit using a very common LM317 adjustable voltage regulator. 

 

The circuit uses any off-the-shelf +5v to +6v power adapter. These are often used for USB powered devices and can be purchased from a variety of sources.  I included an illustration showing how to make a simulated AA or AAA cell, using a wood dowel and metal electrodes from an old battery.  You solder wires onto the electrodes then glue them onto the ends of the wood dowel, cut to the right length.  The dowels can then be snapped into the player’s battery holder with the two wires routed to the eliminator circuit.

Click on Drawing Below to view PDF version of Schematic

Battery Eliminator DiscoverCircuits.com  --   Hobby Corner

More  Micro Power Circuits

Hobby Circuits List
eMail David A. Johnson, P.E. about this circuit


HOME Schematics Index Hobby Corner Dave's Circuits Electronic Resources Contact Info
Imagineering Ezine    Discover Solar Energy Dave Johnson & Associates Faraday Touch Switches


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

Copyright  2002 - 2015 David A. Johnson & Associates.  All Rights reserved. 
 Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.