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Phone line interface for DTMF | Electronics Forums
https://www.electronicspoint.com/forums/threads/phone-line-interface-for-dtmf.97483/
I would use a 600 ohms phone line transformer to have dc isolation, for transmitting DTMF from a computer. My very simple desing work at home, but doesnt work at the office. It seams I don't deliver enough audio level of DTMF. Earlier, I bought a very simple "play/record" device who did work (more audio DTMF level), but humming soon happen with ...
DTMF CONTROLLER INTERFACE - All Spectrum
http://www.allspectrum.com/ramsey/DCI1C/DCI1.pdf
The DTMF audio input uses a standard style RJ-11 modular phone jack (J6 - Phone Line Monitor In) for easy interfacing with your phone line or other audio source (a direct audio pinout for J6 is shown in the wiring section). The input circuitry near the phone jack allows you to continually monitor the audio signal and pull off any DTMF data that comes in so it can be decoded. The …
Intelix Comet-DTMF Phone Interface Module User Manual
https://secure.libertycable.com/media/manuals/Comet_DTMF_User_Manual.pdf
Intelix Comet-DTMF Phone Interface Module User Manual 4 Wiring Instructions When wiring the Intelix Comet-DTMF, please follow the steps below: 1) Connect the POTS (plain old telephone service) line to the RING, GND1, and TIP terminal connector. 2) Wire the ReO bus connector. Do not connect the ReO bus connector to the Intelix MZP matrix.
DTMF CONTROLLER INTERFACE - allspectrum.com
http://www.allspectrum.com/ramsey/DCI2/DCI2.pdf
near the phone jack allows the DCI2 to continually monitor the audio signal and detect any DTMF data that comes in so it can be decoded. The audio sniffer formed by C14, C15, R8, R9, and R10 presents a high impedance to the input signal. This allows connection to the phone line without making it think the phone is off-hook so it will not capture the line and does not interfere with …
Phone audio interface - raphnet.net
https://www.raphnet.net/electronique/phone_audio/phone_audio_en.php
I needed a way to extract audio from a phone line for my DTMF decoder. I found a site full of examples on how to do it, and I built an interface that suited my needs: RCA output, with a signal strong enough to be fed directly to an audio amplifier or line-in
How to interface a DTMF dialer with a Telephone line ...
https://www.electro-tech-online.com/threads/how-to-interface-a-dtmf-dialer-with-a-telephone-line.9095/
Hi all I'm an Electronics Student. I have the same question as "vik1501" and i don't understand the schemtaic given there ref ...
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