blown bulb detection circuit

How hard would a circuit like this be to design from scratch? Just to detect if a bulb is blown in the brake circuit, knowing which bulb isn't important but knowing i have a blown bulb is enough. thanks.

Darren, PM Oldstar

See bulb out indicator. (Not that I've searched for my circuits yet, but I'd probably just redesign base on that Bristolwatch-Paisley link.) Maybe OldStar supernovad?

Back up to a mirrored surface such as a shop front at night, that's taken care of your back lights, as the for the indicator bulbs, watch the instrument panel warning light, if one side suddenly flashes faster then there's a bulb out on that side, at least there is with Euro and Japanese cars.

Phew - I thought this (last reply) was "the other" thread... Alas the commoness of thinkers... I regularly check the reflections off vehicles forward and aft at traffic lights, else the occasional 180 in front of shop windows. Motorbikes usually just required normal shop fronts and side-way glances (since their brake/tail were usually side visible). (My 1973 RD-350 had an OEM stop checker. The dash's stop-lamp would light whenever brakes (switches) were applied, but it would flash if the stop bulb was defective.)     And yes, my flashers alert be via their rate (3W wing/side bulbs excluded). But I also have this remote-ESP where I can magically detect people with standard flasher cans with either a standard bulb out, or LEDs substituted.     FYI - "hyper" flashing LED-indicating motorbikes now have the flash rates I once proposed. (Instant-on with fast frequency at high speeds and returning to normal rates after a few seconds...)