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Here's a newly-uploaded Design Idea to help give circuit building inspiration.It relates to blown-fuses, and creating an indicating circuit that will warn you of failure, important when the fuse body is ceramic or sand-filled for improved protection against arcing.
The Design Idea begins:
Safety fuses or fusible links see wide use in modern electronic equipment to protect the load and the power supply - especially batteries - against short circuits and excessive load current. Fuses are inexpensive and simple, and a wide range of parts is available.
However, you must replace them when they blow, and, when they do, you need an indicating circuit that warns you about its failure, especially when the fuse body is ceramic or sand-filled for improved protection against arcing. The circuit in Figure 1 (PDF) signals that a fuse has blown. Input voltage ranges from 4 to 30V dc. The input range of the 78L05 voltage regulator determines the high limit; the lower one is less than the input range of the voltage regulator, but 4V dc is sufficient for the indicator to operate.Read the full Circuit Design Idea
It is courtesy of Vladimir Oleynik (edited by Martin Rowe and Fran Granville - EDN).
View all the Design Ideas on Electronics Weekly
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