On Jun 17, 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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*Vasos Panagiotopoulos, Columbia'81+, Reagan, Mozart, Pindus, BioStrategist
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Your phone has three states
1. no power
2. OFF HOOK, well maybe ringtone coming in 90Vac at 20Hz ??
3. ON HOOK w/wo dial tone

you can make a simple little tester to catch all three states.

get two 2N5088 NPN transistors, two 10Meg, bridge rectifiers, 9v
battery, 10 r