We have an electric gate for our little neighborhood. The keypad uses a
little circuit board with a pair of white LEDs mounted on a tiny circuit
board to light the keypad. The little circuit board is connected to a
16VAC transformer through a 600 ohm resister.
One LED is forward biased, and the other is backward biased. So I assume
they alternate lighting up as they get juice from the transformer. Well,
both LEDs are done, finny, kaput.
What I'm wondering is if I can put a new pair of 12V LEDs in this
circuit and whether the 600 ohm resister is enough to protect them from
the ~~ 18VAC that is coming through the transformer? Or should I put in
a bigger resister? I have no idea how much forward current an LED can
handle.
--
bp
<part15sbs{at}gmail{dot}com>
