26 Apr
2011
26 Apr
'11
10:24 a.m.
At 12:00 -0500 4/26/11, ard wrote:
One of the easiest things to sue for this are low
voltage filament
lamps 12V car bulbs (say a 12V 5W taillight bulb) is fine for a 12V
supply. And probalby fine for a 15V supply too (yes, the bulb will have a
short life at the higher voltage, but not so short as to worry you). For
the 5V line, a 6V bulb is the best thing to use, many older cars had 6V
electrics nad you may well be able to get a 6V 30W bulb (which will draw
around 5A) from a vintage car parts company. I bought a couple of
headlight bulbs (each with a apr of 30W or so filaments and a couple of
stop/taillight bulbs (5W and 21W filamnets). That gives me a good
selection of laod currents (and yes, I once parallel to two filaments of
a headleam bubl to give a load drawing somewhat more than 10A to test a
large SMPSU).
FWIW, bicycles use a wide variety of bulbs, in a wide variety of
voltage ratings. Here's one page
http://www.reflectalite.com/halogenpage.html
listing a bunch of them, in voltages from 2.2 V to 6 V and wattages
from 1.25 W to 20 W. (Not a recommendation, they were
just what came
up first when I googled "bike headlight bulbs". I'd
actually
recommend your local brick-and-mortar bike shop, who could probably
use the business...)
I don't expect these are very cost-effective, but they should be more
available (for the time being, anyway, until LED's take over there
too) than antique-auto bulbs. But you may want/need to run several in
parallel to add up the required power.
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