Quote:
Originally Posted by emeritus
I suppose you could use a battery-powered relay with mains-rated contacts to energise the transformer only when the bell push operated the relay. This would offer a saving if the relay current was significantly less than the bell current, but it's probably not worth the effort.
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A take-over circuit could be arranged with a couple of diodes gating the relay to run off rectified transformer output instead of battery, so that the battery only needed to provide a brief initial blip of actuation current. Devise an unlatching circuit, then next the battery could be replaced by a suitable "supercap"and top-up circuit- and a slide into the syndrome of over-engineering....