Fuse blown indicator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Protection of equipment from emergency operation of the network, uninterruptible power supplies
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The fact that the fuse in the radio equipment has blown will be warned by a simple automatic device, the scheme of which was published by the magazine "Radio Fernsehen Elektronik" (GDR). While the fuse F1 is intact (see figure), the voltage between the emitter and the base of the transistor V1 is zero and the semiconductor device is closed. As soon as the fuse burns out, immediately a voltage appears on the base of V1, which opens the transistor, and the LED B1, included in the collector circuit, will begin to glow, indicating an "accident".
Depending on the type of LED and the supply voltage, the resistance of the resistor R1 is selected so that the transistor opens completely. If the supply voltage exceeds 4,5 V, an additional ballast resistor must be connected in series with the LED, limiting the current through B1 to the maximum allowable value.
Transistor V1 - any silicon, low-power: KTZ61, KT326, KT208, KT203. Diodes V2, VZ - D219, D220. LED B1 - AL102 with any letter index.
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