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12-28-10, 04:03 AM
Replies: 7
Views: 2,114
Posted By Rick Johnston

With the telephone on hook you'll measure about...

With the telephone on hook you'll measure about 48 volts DC in the USA. However, the current you can draw is just a few microamps -- completely useless. Off-hook (with a 150 to 1,000 ohm load) the...
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