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Subject: Re: Audio transformer interface with phone line

Date: 05/08/02 at 11:58 AM
Posted by: Russ Kincaid
E-mail: russlk@yahoo.com
Message Posted:

In Reply to: Audio transformer interface with phone line posted by Akwasi on 05/07/02 at 1:51 PM:

You can (and should) leave the center-taps not connected. When you connect the primary across the phone line, it will draw DC current and take the phone off hook. This may or may not be desirable. To prevent the DC current and leave the phone on hook, connect a capacitor (3.3uF) in series with the primary.

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