Can't hear the signal in Telephone Line project!

[member_tdh]

Hi!
I'm making Telephone Line project with some components: HM9102 (dialer), TEA1062 (Microphone interfacing), LS1240A (Buzzer).
My problem is: I can't hear any signal from Microphone!
Could anybody have ideas...??? Pls help me!?! :idea:

Line --> Buzzer -->earphone.....ok!!!
Mic --> Line --> can't hear...!!! ERROR!

 

[bobcat1]

tea1062

HI

This is a difficult to solve probelm !!!!

First you must learn how the analog phone line works - seasrch google to know how

Then you will need to know how to use hybird audio circuit with analog phone circuit - this might help you debuging your audio problem

All the best

Bobi

 

[pranam77]

Re: Telephone Line

The condensor mic has a polarity. See wether it is connected the right way. Also see you get a voltage more than 2 volts at the + tive pin of the MIC. See the capacitor connected to the mic is OK. If this does'nt work, Please post the schematic here. We'll try to solve the problem. Hope this HELPS. Good luck.