Re: Help - I need a design for a 6 volt, 700 mAmp dc power supply
- From: ehsjr <ehsjr@xxxxxxxxxxxxxxxx>
- Date: Sat, 28 Apr 2007 22:34:12 GMT
jcsealock wrote:
I want to build a sturdy, portable dc power supply to plug into my MP3
player that has issues with charging its internal battery. It works
just fine with the AC/DC adapter but want my player to be "portable"
again.
Since I'm just now learning basic electronics I would rather build a 6
volt, 700 mAmp power supply powered off of one or more rechargeable
batteries than wait until I know enough to repair the mp3 player (if
ever).
Any pointers/designs anyone wants to share?
Thanks.
You can buy a 6V sealed lead acid battery like part
CAT# GC-613 from Allelctronics and use that. You'll
need to buy/build a charger for any rechargeable battery
you use. Here's a simple trickle charger schematic
for the battery mentioned above:
-----
+12 ---[10R]---+---Vin|LM317|Vout---+-----> to battery +
| ----- |
| Adj [240R]
| | |
[.1uF] +----------+
| |
| [1075]
| |
Gnd -----------+---------+----------------> to battery -
You can use a 1K and a 75 ohm resistor in series to make
the 1075 ohm resistor. For the 10 ohm power resistor,
you can use 2 20 ohm, 7 watt resistors from Allelectronics
in parallel (their 10 ohm 25 watt resistor is sold out).
The others can be 1/4 watt. You can use any 12 vdc wall
wart capable of 300 mA or more, like CAT# DCTX-1234 from
Allelectronics.
Ed
.
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- From: jcsealock
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