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It came to me in a flash. A
simple way to see if a fuse has blown without removing it from its
holder.
Its not often you can design a circuit using just two components,
but with just one resistor and an
LED this circuit provides visual
indication of when a fuse has blown.
LED 1 is normally not lit,
being "short - circuited " by the fuse, F1. Should the inevitable
"big-bang"
happen in your workshop then LED1 will illuminate and led you know
all about it! Note that the
LED will only light under fault
conditions, i.e. a short circuit or shunt on the load. In this case
the
supply current is reduced to a safe level by R1.
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