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Encyclopedia of radio electronics and electrical engineering / Indicators, sensors, detectors
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The proposed device will remind you that when leaving the apartment, you need to turn off the lights and household appliances.
In the circuit shown in the figure, the LED will only glow if there is current flowing in the mains circuit. As a rule, in modern apartments there are at least two voltage supply circuits. It is easy to install such a scheme on each circuit. To power the refrigerator, you need to lay separate wires from the shield. The LED should be placed near the front door. The above circuit has a sensitivity threshold of 40 W, so the operation of devices (TV, clock) in standby mode does not cause the indicator to glow.
For the manufacture of the current transformer T1, a unified telephone transformer was taken, the upper winding was removed from the frame and turns were wound in its place (4-6) until the free space was filled with PEL-2 wire with a diameter of 1 mm. In this case, T1 allows a current of up to 15 A to pass through itself (power 3 kW).
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Zoologists have discovered a new species of spider in Mexico that feeds almost exclusively on acacia leaves and nectar.
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