11-03-2015, 09:53 AM
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#16
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Here's detail of the ringing systems used for telephony:
https://en.wikipedia.org/wiki/Tip_and_ring
In the USA today it's about 50 volts. Field phones used up to 130V AC at about 20 hertz.
That is quite a handful!
__________________
 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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