"mike" wrote in message
...
On 6/17/2012 4:32 PM, wrote:
I want to put an LED to test my phone line, which I found to be ca 50v.

Where/how do I find the right LED?

THe LEDs at Radio Shack are all like 2v (yea I remember VCC of 2.3 on
diodes
in my EE2 for non EEs course).

Should I just use a regular bulb, like the kind used for Christmas
lights,
instead? (what about the LEDs used for CHristmas lights? Shouldn't they
work?)

Besides, I really only want ONE LED.

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A series resistor will answer your question.
Assume you now all about what happens when you load a phone line.


And of course what happens when a ring signal appears across the line ...

Arfa