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
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The device, the scheme of which is shown in fig. 7.20, is intended not only to indicate the inclusion of equipment, but also to control the health of the fuse supplied in the DC circuit with a voltage of up to 20 V.
With a good fuse F1, a direct voltage is applied to the diode V3, the diode is open and the lamp is on, signaling that the equipment is on. Transistors V1 and V2, shunted by diode V3, do not affect the operation of the device. When the fuse blows, the signal lamp is connected to the rectifier through transistor V2. At the same time, a relaxation oscillator assembled on a unijunction transistor V1 comes into operation.
The oscillation frequency of the generator depends on the resistance of the resistor R3 and the capacitance of the capacitor C1 and in this case is 1...2 Hz. With this frequency, the light starts flashing, indicating a fuse failure. Diode V3 is designed to eliminate the influence of the load resistance on the operation of the indicator. If it is absent (i.e., instead of a diode, there is a wire jumper) and the load is short-circuited (the fuse blows), transistor V2 may fail.
The KTP7A transistor can be replaced with KT117B ... KT117G, the KT603B transistor - with KT608A, KT608B, the KD103A diode - with D220, D223. Signal lamp - CM28-0,05 or another, its voltage is selected depending on the voltage of the power source.
Author: Semyan A.P.
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