I thought he wanted the LED to latch on to show a missed call.
If you just want to light a LED when the bell is ringing I would put a
couple hundred volt silicon diode (1n4003 or similar) in series with a
6.8k or so resistor and the LED. That should get you close to a
typical 15ma through the LED. Lower ohm resistor will get you a
brighter LED ... until you blow it. Check the spec if you want to be
pedantic about it. Dr Ohm will give you guidance based on 100v or so
On Saturday, August 13, 2016 at 9:38:42 AM UTC-4, Mr. Man-wai Chang wrote:
You;ve been given several suggestions now, from a cheap ring detector
module that has a relay output that you can buy, to putting a diode
and resistor with LED on the phone line. And you didn't initially
say where this has to fit, exactly what you're trying to do. It's
still far from clear. Now it sounds like you want to replace an
existing neon bulb in an old phone, where that bulb is probably
driven directly by the ring voltage? In that case, Gfre's solution
of a diode and resistor with LED sounds like it could work.
On Friday, August 12, 2016 at 10:38:23 AM UTC-4, firstname.lastname@example.org wrote:
A quick google produced this, which is cheap and should serve the
That's first thing I saw, probably more on Ebay, etc.
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