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Tuesday, June 01, 2021 03:06 PM
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Battery Eliminator -- April 5,
2009
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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.
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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. |
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Click on Circuit Below to view PDF of Schematic |
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eMail David A.
Johnson, P.E. about this circuit |
