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Phone line interface: Replacing a 1:1 transformer with an optocoupler

I've often pondered, but never tried... has anyone tried to pick up the signal from the CURRENT in the loop?

...Jim Thompson

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|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
|  Analog/Mixed-Signal ASIC\'s and Discrete Systems  |    manus    |
|  Phoenix, Arizona            Voice:(480)460-2350  |             |
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Reply to
Jim Thompson
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Michael, you sound like you need a vacation.

Anyway, if the OP is looking for an circuit example, the October 1981 QST, reprinted in the 1991 ARRL Handbook for Radio Amateurs has a optocoupler based phone interface using several 4N28's and a couple of 741's.

Mark Zenier snipped-for-privacy@eskimo.com Googleproofaddress(account:mzenier provider:eskimo domain:com)

Reply to
Mark Zenier

Excellent! But how do I get a copy of this? I'm not living in the US right now, and I'm not sure where to start looking on the web. Could anyone share a copy with me?

Reply to
OBones

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