On Thu, 13 Sep 2007 11:47:27 UTC, wrote:

Hi all,

Just an academic question.

What used to be used in Car Battery charger to convert the AC - DC
before silicon diodes/bridge rectifiers came along?

Supplementary:

What used to be used in car battery chargers to convery 240v to 12v when
the mains was DC?

(my train set used a small rotary converter)

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