Quote:
Originally Posted by recycledelectron
Using a US wall wort would be bad.
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Not necessarily. That is EXACTLY what I do with my PRS500 charger. I have put aside the US cable that goes between wall and the charger and purchased european cable plugged it into wall and into the charger. The label on the charger says: Input 100 - 240V, 50-60Hz.
So I have plugged the charger into 230V 50Hz mains socket, measured (with and without load using digital and also good old analog voltmeter) that it really gives 5.2V at the output and then I connected the Reader.
Simple and easy.
The charger for PRS500 is a Switched-mode power supply
see
http://en.wikipedia.org/wiki/Switched-mode_power_supply
Quote:
Switched-mode PSUs in domestic products such as personal computers often have universal inputs, meaning that they can accept power from most mains supplies throughout the world, with rated frequencies from 50 Hz to 60 Hz and voltages from 100 V to 240 V (although a manual voltage "range" switch may be required). In practice they will operate from a much wider frequency range and often from a DC supply as well.