Re: Nav light lamp monitor


"Martin" <me@xxxxxxxxxxx> wrote in message > >> Why not put a red LED +
suitable resistor (to drop voles from 24 to 3) in
parellel with the bulb? Bulb fails = LED comes on.

But if bulb doesn't fail, LED still comes on?
Or have I missed something?

Wind a few turns of wire round a reed switch, using two strands of wire, so
that you have two windings, each enough to operate the switch with the
current a nav light takes. Connect one winding in series with each (port and
starboard) nav light, but connect them in opposition. If both lights are
working, the switch won't operate, but if one fails, it will. Do the same
with the stern and masthead lights, connect the two switches in parallel,
and use them to switch a warning light. You might be able to do it with one
switch with four windings, but I doubt it.

John.


.

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