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Telephone line audio interface circuits - ePanorama
https://www.epanorama.net/circuits/teleinterface.html#:~:text=The%20telephone%20has%20a%20circuit%20called%20network%20interface,changes%20the%20other%20telephone%20causes%20to%20the%20speaker.
Telephone line audio interface circuits - ePanorama
https://www.epanorama.net/circuits/teleinterface.html
The telephone has a circuit called network interface (also called voice network or telephone hybrid) which connects the microphone and speaker to the telephone line. Network interface circuitry is designed so that it sends only the current …
Phone Audio Interface - Electronics DIY
http://electronics-diy.com/phone-audio-interface.php
The interface can stay connected on the line at anytime (no problems with the ring signal), and does not take of the hook. The interface must provide isolation from the line. I discovered that it can also be used to inject audio in the line. I found …
Properly Interfacing Audio And POTS (Plain Old …
https://www.prosoundweb.com/properly-interfacing-audio-and-pots-plain-old-telephone-service/
A phone patch, or phone tap, is necessary to interface line-level analog audio to and from POTS. The phone patch allows connecting standard …
Telephone Circuits Page - QSL.net
https://www.qsl.net/yo5ofh/hobby%20circuits/telephone_circuits.htm
Telephone Audio Interface Audio from a telephone line can be obtained using a transformer and capacitor to isolate the line from external equipment. A non-polarized capacitor is placed in series with the transformer line connection to prevent DC current from flowing in the transformer winding which may prevent the line from returning to the on-hook state.
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