The diode in series is said to save energy. Something about the asymmetry allowing you to get more power for your money. I'm planning to modify a radiator heater with some SCRs to do the same and silence it at the same time. (It currently uses relays to control heat, which means that if I use it as a bedroom heater, I would have to put it farther away, reducing efficiency. The SCRs will do the half wave trick and not make any noise when switching.)
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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