voltage of telephone lines
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in Canada the voltage of your telephone line is up to 48V DC. It usually lingers around 5V and when you get connected or it "rings", the voltage spikes to 40V- 48V
There is a good paper on the subject here:
http://www.tkk.fi/Misc/Electronics/circuits/teleinterface.htmlAnonymous 05 Nov 2005, 03:33 - Report
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Volatage/Frequency in Canada
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