interface handphone to at89c51/52

take a look at this schematic, I used this to connect a mobile headset's speaker o/p to the controller.
adjust POT to get a nominal current value.

I used this configuration for DTMF reception. I dont know for what purpose you need it.
... Read Compelte post
Other Tags: mobile headset   nominal current   dtmf   current value   i dont know   
Posted by ajay_bhargav on Fri Apr 27 2007, 03:08 am

Downloads

Comments

ChrisLub
Tue Apr 23 2024, 05:21 pm
Davidbab
Tue Apr 23 2024, 10:41 am
Richardrit
Tue Apr 23 2024, 09:54 am
HenryLaf
Mon Apr 22 2024, 03:50 pm
bleradrar
Mon Apr 22 2024, 06:38 am
ppu-pro_ka
Sun Apr 21 2024, 07:39 pm
Infewow
Sun Apr 21 2024, 06:30 pm
HumanTak
Sun Apr 21 2024, 12:26 pm