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Telephone Audio Interface - Electronics DIY
http://electronics-diy.com/electronic_schematic.php?id=483
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 …
Phone Audio Interface - Electronics DIY
http://electronics-diy.com/phone-audio-interface.php
The schematic of the phone audio interface I built: I have added a switch to choose between a 620 ohms and 33k resistor. This attenuates the signal coming out from the interface, provided there is at least a small load (10k works fine) between …
Telephone interfacing circuits - ePanorama
https://www.epanorama.net/circuits/teleinterface.html
Telephone hybrid circuit is the circuit which is designed for converting 2-wire interface to 4-wire interface and is one of the basic building blocks of the telephone system. Telephone hybrid is the circuit which separates the …
Phone audio interface - raphnet.net
https://www.raphnet.net/electronique/phone_audio/phone_audio_en.php
This attenuates the signal coming out from the interface, provided there is at least a small load(10k works fine) between audio out and audio gnd. Important: This circuit works in Canda and probably in the United States. It has not been tested in europe, but it may work if the phone system is similar enough.
Telephone Line Audio Interface by Andrew R. Morris
http://www.discovercircuits.com/Andy/Telephone_Line_Audio_Interface.htm
Telephone Line Audio Interface: All materials and content contained on this page are the exclusive intellectual property of Andrew R. Morris and may not be copied, reproduced, distributed or displayed without his express written permission.
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