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Upgrade your car battery charger

Based on a Labs project | October 2011 | Find it here
Upgrade your car battery charger
Many car battery chargers costing not more than £12- £15 are pretty spartan devices. Car owners should beware of using such chargers which otter no protection whatsoever. This article describes a simple upgrade circuit that adds voltage and current limiting, and polarity reversal protection, to such inexpensive chargers.
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