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Subject: Re: Shamingly obvious question about NiMH vs NiCad chargers

Re: Shamingly obvious question about NiMH vs NiCad chargers

From: gerald clark <>
Date: Mon, 25 Nov 2002 18:45:45 -0600

The current rating on a DC power supply is the maximum current that can
be supplied without exceeding allowable ripple in the output.
It is not a current limiting specification, but a current supplying
You may use less than the rated current, but you can not use more
without risking damage to the equipment being powered.

George Michaelson wrote:
> God, how embarrassing not to know these things.
> If one owns an older tandy (blush) NiCad charger, is this 'safe' to use to
> re-charge NiMH or are they radically different and require a different charger
> and current?
> Also, I spoke to a source of AC/DC plugpacks yesterday and he was pretty
> adamant that the current limiting requirement to 600ma from the 9v pack or
> 1.2a from the 12v pack was meaningless, it was the device which determined how
> much current was drawn. I didn't buy this, but also I don't *understand* this
> area.
> I'm not an electrical engineer. I don't even play one in Soap Operas. I don't
> intend risking my device either, so I'm sticking to my US charger in a
> 240v->110v stepdown unit until I can get a regulated 9v/600ma DC block. I
> tried one rated to 300ma, it didn't charge, but it does trigger the poweron
> behaviour of the volts-in, I guess thats a mechanical switch right?
> -George

Gerald L. Clark
Aero TerraTrike #1
Member: Sky Soaring
Illinois, U.S.A.
Received on 2002-11-26

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