Nov 3, 2005 #1 K khongai Full Member level 4 Joined May 20, 2005 Messages 229 Helped 16 Reputation 32 Reaction score 11 Trophy points 1,298 Activity points 2,919 How can i detect signal on telephone line ( use for both pulse and tone dial) use MCU ? May anyone give idea to me ? and diagram, tutorial, ...?
How can i detect signal on telephone line ( use for both pulse and tone dial) use MCU ? May anyone give idea to me ? and diagram, tutorial, ...?
Nov 3, 2005 #2 I IanP Advanced Member level 7 Joined Oct 5, 2004 Messages 7,929 Helped 2,311 Reputation 4,624 Reaction score 531 Trophy points 1,393 Location West Coast Activity points 66,416 Re: Telephone line ??? Try circuits from this link: **broken link removed** Regards, IanP
Nov 3, 2005 #3 U uk Member level 2 Joined Feb 10, 2005 Messages 46 Helped 1 Reputation 2 Reaction score 1 Trophy points 1,288 Activity points 375 Re: Telephone line ??? Which signal do you want to detect ? ring signal? voice ?
Nov 3, 2005 #4 K khongai Full Member level 4 Joined May 20, 2005 Messages 229 Helped 16 Reputation 32 Reaction score 11 Trophy points 1,298 Activity points 2,919 Re: Telephone line ??? all of them.
Nov 27, 2007 #5 J jason99pan Junior Member level 3 Joined Mar 15, 2007 Messages 28 Helped 1 Reputation 2 Reaction score 0 Trophy points 1,281 Activity points 1,413 Re: Telephone line ??? I'll suggest... 1. If you want to detect the DTMF and dial pulse, there are some commerical chips can do this job. You can search in google... 2. If you want to detect the ring signal, you may use high voltage zener diode to detect the ring signal... Hope it will help you....
Re: Telephone line ??? I'll suggest... 1. If you want to detect the DTMF and dial pulse, there are some commerical chips can do this job. You can search in google... 2. If you want to detect the ring signal, you may use high voltage zener diode to detect the ring signal... Hope it will help you....
Dec 4, 2007 #6 funnynypd Banned Joined May 9, 2007 Messages 436 Helped 48 Reputation 100 Reaction score 25 Trophy points 1,308 Location USA & Canada Activity points 0 Telephone line ??? Did you searched on Microchip web, they used to have a good reference.