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1:1 Isolation transformer for telephonic line

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renato_gb

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Hello everyone

I have a caller ID project in which I use an optocoupler to isolate the circuit from the telephonic line. I´d like to test the same circuit using a 1:1 isolation transformer (600Ω), but here (brazil) I can´t find one to buy, so I´d like to know how to build one. I mean, number of turns, width of the wire, all the information that I need to build one.

There´s an attached picture showing what I´m talking about.

Thanks in advance
Renato
 

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