Re: power adapter... will it explode?

From: N. Thornton (bigcat_at_meeow.co.uk)
Date: 10/06/04

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    wiso123@ms9.hinet.net (SolarWind) wrote in message news:<ac0d3c54.0409230221.7b737a18@posting.google.com>...
    > "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???

    It depends on the real voltages, not the marked ones. real ones are
    often a fair way removed from what it says.

    You may fry your wall wart, but if you keep the volume down to .4/2
    times max it should be ok. Pulling 2A from a .4A wart is a bit
    optimisitc.

    > 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:

    just 2 tiny tech details:
    1 rectifier diodes typically drop 1-1.5v on load, 0.6v is just the
    turn on knee.
    2 we dont know what the real Vs involved are

    NT

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    • Re: power adapter... will it explode?
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