Peter L. Peres wrote:
> Think again. A rheostat will glow orange if the power is used for
> experiments by enterprising youngsters. Semiconductors would not have
> the same show effect and may lower the retail value of the product
> (e.g. 'that c**p electronic speed control burned out immediately when
> I charged the SLA battery with it - get the old kind, they don't make
> them like they used to anymore).

That's only with a badly designed circuit that doesn't protect itself
adequately.  Such a device really would be crap in that market.  However,
that doesn't mean it can't be done right.


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