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3 V mains supply for portable radios

Based on a Labs project | October 2011 | Find it here
3 V mains supply for portable radios
Most small portable radios require a 3 V supply normally provided by two size AA or AAA batteries. Since rechargeable batteries are an option with many of these radies, most of them are fitted with a charger socket. When such radios are used in a stationary condition, e.g. in the kitchen or in the office, it is useful (and economical) to use the mains operated supply described here.
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