This is one of the simplest yet effective alarm cum monitor for detecting any blown fuse. A resistance of value 1K is placed in series with a LED and connected across the fuse which is to be tested.
Normally when the fuse is healthy, LED 1 will not get any bias.
Thus, it will not raise an alarm. However, the moment the fuse is blown, LED1 gets a feed in bias and starts to glow.
The value of the resistor R1 and its wattage should obviously be decided depending on the type of LED and the supply across it.
Suitably connecting a 12V zener and a 12V electronic buzzer across the fuse can enable an audio output (alarm sound) if so required.
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