20mA is a safe assumption
Sent from my iPhone
> On Apr 12, 2018, at 8:02 PM, Bill Prince <part15...@gmail.com> wrote:
>
>
> 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>
>
