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Originally Posted by AndiiT
... the relay may have to be fed via a bridge rectifier to accommodate for line reversals ...
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No! The whole point is that
detects line reversals! AC is AC, whichever you look at it! The diode - which can be either way round - ensures that the relay only operates on alternate half cycles. It is this action that ensures that the output frequency matches that of the incoming AC.
Quote:
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... unlike "off the shelf" REN boosters, it wouldn't be a BT approved device ...
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which is the reason that I suggested the alternative of using a battery supply ...