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Mains filter revisited

Based on a Labs project | October 2011 | Find it here
Mains filter revisited
The mains filter described in ‘PC Topics’ (April 1998) could do with two useful additions: a fuse monitor and a voltage indicator. The filter proper consists of capacitors C3–C7 and inductor L1. Its operation is described fully in the April 1998 article. The present article deals only with the additional features.
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