coffee machine switch

11-42 — elektor november 1980 coffee machine switch nh111Ie swkch Did you know that even your coffee machine could save energy? With the aid of this clever littie circuit it can make up for its user"s forgetfulness, namely, by switching off the hot plate as soon as the coffee pot is picked up. A warning signal is then sounded, so that if the remaining coffee is to be kept warm a button must be pressed. This circuit switches the hot plate off automatically when- ever the coffee pot is re- moved. When it is replaced a buzzing tone is heard as a "I somn C3 7812 lsv Toa BV 164 BV 179 si micro switch 1/2V~. o~i J o s2 More and more people are taking to drinking coffee these days and coffee machines certainly prepare a good cup efficiently. They even keep your second cup warm for you. The trouble is, you don"t always want another cup, which means a fair amount of electricity is going "down the drain" — 500 watts to be exact. tronic zero-crossing switch (everything behind the opto-co...