In article ,
The Natural Philosopher wrote:
Unless they've cunningly used the transformer's impedance to give a
sagging output with increasing load. Saves the regulator and means the
transformer's cheaper, too.

Or in older times a nasty copper oxide rectifier with a massive forward
impedance.

Oldest charger I've got - '50s - still has a resistor. Or rather a couple
so you can set the charge rate. Approximately.

--
*If at first you don't succeed, redefine success.

Dave Plowman London SW
To e-mail, change noise into sound.