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I just found out that Radio Shack has now officially "devalued" their
Portable CD Player Power Pack. This unit was originally priced at $40.00.
Now they are going for $1.00 (one dollar). I love these things. I have been
using a couple of them with my portable DAT player for a couple of years.
They claim up to 20 hours of run time and enough charges to replace 5,000
alkaline batteries. The output is 3 - 4.5v. It recharges with any 4.5v wall
wart. It even mentions "mini-disc players" on the casing. If you are lucky
enough to find one for a buck, buy it. That is a bargain even if you use it
for a paper weight. I am not sure about the shelf life so those that remain
in the stores could be nearing the end but . . .
Jim Lee
Graham Baker wrote:
> Here's the original post of Renard's that fixes the Sharp charging
> problems.
> GB
>
> ----- Original Message -----
> From: Renard A. Dellafave <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Tuesday, 23 December 1997 8:23
> Subject: Re: MD: Sharp 701 recharge problems (how to build 5V supply)
>
> > >A 6V 800mA unit will work if a current limiting resistor is inserted
> > >in the hot lead.
> >
> > OK, if you're going to go to THIS much trouble do it right and buy a
> 7805
> > regulator. Power to the left pin, 5V out on the right pin, and ground
> for
> > both in the middle. Handles up to an ampere with a heatsink (not much
> > without).
> > Better run at least 7V in to be safe, it has a pretty high dropout
> (i.e.,
> > amount the input needs to exceed the output voltage) as regulators go,
> but
> > it's cheap, reliable, and puts out an honest-to-goodness five volts.
> > Available at Radio Shack, or ANY electronic parts supplier (this is a
> VERY
> > COMMON part). Ideally you might throw a 100uF capacitor on the input
> and a
> > few hundred on the output but they work fine without that.
> >
> > You can buy a metal project box at RS too and use that as the heatsink,
> get
> > a couple grommets...easy project if you have any soldering skills at
> all.
> >
> > BTW, the input adaptor needs to be able to supply the full 800mA (or
> > whatever the portable needs) current. Input voltage is not that
> important.
> > Anything from 7V DC on up to, oh, I wouldn't go over 12 V in, would be
> > fine. The reg can handle 30V in I think, but remember that all the
> > overvoltage (times current) gets turned into HEAT.
> >
> > e.g. with 12V in, 5V out, at 1 ampere it'll dissipate 7 Watts. I think
> > that's within spec for a good heatsink...with 7V in it would only
> dissipate
> > 2 Watts.
> >
> >
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--
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James S. Lee | Net: [EMAIL PROTECTED]
Communication Studies, CB# 6235 | Phn: 919-962-4963
University of North Carolina - CH | Fax: 919-962-3305
Chapel Hill, NC 27599-6235 | Web: www.unc.edu/~jimlee/
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