call waiting - Electronic Circuits Projects Diagrams Free

haerifar · 28th March 2004, 04:46 PM

can any one tell me how can i detect call waiting tone ?
and what is the frequency of call waiting ?

DemonRising · 28th March 2004, 08:16 PM

hi,

what is the frequency of call waiting ?
440Hz. although i am not sure if it's a standard or not. there is a link below which elaborates more on it.
http://www.leinweb.com/snackbar/internot/

how can i detect call waiting tone ?
i would use a 567 tone decoder ic. i've used them in the past, and they've never failed me. they work on 5V, use minimal components. you can also have the ouput of the ic latch if you like.

hope this helps you.

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28th March 2004, 04:46 PM	(permalink)
haerifar	call waiting can any one tell me how can i detect call waiting tone ? and what is the frequency of call waiting ?

28th March 2004, 08:16 PM	(permalink)
DemonRising	hi, what is the frequency of call waiting ? 440Hz. although i am not sure if it's a standard or not. there is a link below which elaborates more on it. http://www.leinweb.com/snackbar/internot/ how can i detect call waiting tone ? i would use a 567 tone decoder ic. i've used them in the past, and they've never failed me. they work on 5V, use minimal components. you can also have the ouput of the ic latch if you like. hope this helps you. __________________ What\'s the worst thing that can happen?