Transformer question (only slightly OT)
ard at p850ug1.demon.co.uk
Sun Sep 3 17:58:22 CDT 2006
> My father built himself a board which was similar but more elaborate:
> he could select among (1) a small (7.5W?) light bulb, (2) a large
> (100W?) light bulb, (3) a high-wattage heating element that was still
> under the breaker trip current for that mains circuit (an iron, I
> think), or (4) no limiter at all.
Another useful limiter (to repleace (3) in your setup is a 1000W tungsten
halogen bulb (e.g. one of those 'security lamps'. They're pretty cheap
The advantage of light bulbs is the postive temperature coefficient of
the filament. THey have a low resistance when cold (and thus drop almost
no voltage, often a small device will happily run with a bulb in series),
but limit the current if there's a dead short.
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