Oct 5, 2004 #1 N nford Junior Member level 1 Joined Jul 30, 2004 Messages 18 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,281 Activity points 220 phone line interface Hi I need to interface a microcontroller to my phone line via a DTMF(touch tones) decoder. Does anybody have a schematic for this interface? and does anybody know of a suitable IC to decode DTMF tones? Thanks Nick
phone line interface Hi I need to interface a microcontroller to my phone line via a DTMF(touch tones) decoder. Does anybody have a schematic for this interface? and does anybody know of a suitable IC to decode DTMF tones? Thanks Nick
Oct 5, 2004 #2 flatulent Advanced Member level 6 Joined Jul 19, 2002 Messages 4,624 Helped 489 Reputation 980 Reaction score 151 Trophy points 1,343 Location Middle Earth Activity points 46,689 Re: phone line interface There are several things to keep in mind when connecting to the telephone line. 1. There are legal issues to comply with. These are usually published with the complete set of government regulations. 2. There are some high voltages on the line such as ringing and on/off hook. Your circuit will have to survive their presence.
Re: phone line interface There are several things to keep in mind when connecting to the telephone line. 1. There are legal issues to comply with. These are usually published with the complete set of government regulations. 2. There are some high voltages on the line such as ringing and on/off hook. Your circuit will have to survive their presence.
Oct 5, 2004 #3 H House_Cat Advanced Member level 4 Joined Feb 21, 2002 Messages 1,369 Helped 406 Reputation 812 Reaction score 98 Trophy points 1,328 Location USA Activity points 16,416 Re: phone line interface A couple of chips that might be useful: **broken link removed** http://www.calmicro.com/products/data/pdf/cm8888.pdf A source of schematics for ideas: http://www.discovercircuits.com/T/telephone.htm **broken link removed**
Re: phone line interface A couple of chips that might be useful: **broken link removed** http://www.calmicro.com/products/data/pdf/cm8888.pdf A source of schematics for ideas: http://www.discovercircuits.com/T/telephone.htm **broken link removed**
Oct 6, 2004 #4 papyaki Advanced Member level 2 Joined Apr 13, 2002 Messages 537 Helped 38 Reputation 76 Reaction score 19 Trophy points 1,298 Location France Activity points 5,346 Re: phone line interface Hi, Look at this link, it is a full line interface with description : h**p://www.midcom-inc.com/tech/tn88.htm Regards
Re: phone line interface Hi, Look at this link, it is a full line interface with description : h**p://www.midcom-inc.com/tech/tn88.htm Regards
Oct 13, 2010 #5 S sreein Junior Member level 1 Joined Oct 11, 2010 Messages 15 Helped 1 Reputation 2 Reaction score 1 Trophy points 1,283 Location india Activity points 1,394 Re: phone line interface this link is not working
Oct 13, 2010 #6 papyaki Advanced Member level 2 Joined Apr 13, 2002 Messages 537 Helped 38 Reputation 76 Reaction score 19 Trophy points 1,298 Location France Activity points 5,346 Re: phone line interface Then try this one h**p://hackedgadgets.com/2007/03/27/alarm-phone-dialer/ (replace * by t)
Re: phone line interface Then try this one h**p://hackedgadgets.com/2007/03/27/alarm-phone-dialer/ (replace * by t)