Re: power adapter... will it explode?

From: SolarWind (wiso123_at_ms9.hinet.net)
Date: 09/23/04 

Date: 23 Sep 2004 03:21:56 -0700

"Jim Rex" <jimrex0@hotmail.com> wrote in message news:<vPednfO1ttQjlc_cRVn-uA@rogers.com>...
> Hello,
>
> I have a pair of speakers that need a 13V and 2A DC power adapter or wall
> wart. I lost its wall wart and found a wall wart for another device, which I
> have no idea what its for.. it gives out 15V and 400mA DC.
>
> The power adapter I found said on its back that it must not be used with any
> other device except..[some brand name]...
>
> Now, I used it with the pair of speakers and it worked!!! Now, i'm worrying
> that this configuration could cause it to explode or something....
>
> Will it do any harm???
>
> P.S. (im cross posting to two newsgroups...)
>
> Thank you

If you don't like to locate another 13V 2A DC power adapter, the
following way may solve your problem:

To find 3 1N4002 power diode in serial with your power adapter before
the plug,
each diode will drop 0.7V DC, and 2.1V for 3 diodes total, the diode
cost is very low, you can find it in any electronic component shop:

    ----------
    | | + 1N4002 x 3 each
  --| Power |--------->|--->|--->|-------- To plug +
  --| Adapter | _ 15V DC 12.9V DC
    | |----------------------------- To plug -
    ----------|
 
The load of adapter is depending on the volume output of speaker, you
can touch the plastic case to feel the temperature, warm is OK, but
not hot.

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