fridge alarm - 'freeze' energy

11-34 — elektor november 1980 fridge alarm "freeze" energy Most modern fridges are made up of thick layers of insulating material to reduce energy consumption to a minimum. Even so, however well the fridge is insulated, if the door is opened frequently or left open for Jonger than necessary no amount of insulation wilt keep costs down. It is easy to see that however careful the family is when going to the fridge, the chances of the door being left ajar, for quite lengthy periods, are fairly high. We are informed, from a reliable "sauce", that on occasion things can become somewhat hectic during cooking and checking to see whether the fridge is closed would not be on the list of high priorities. Understand- able, but expensive all the same. Thus, some kind of warning device to attract your attention to the open fridge door would be a great help. The alarm circuit here is activated by the fridge interior light, that is, when- ever the door is opened. The alarm will remain silent f...