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

SamuelSmise
Thu Apr 25 2024, 09:56 am
DustinErele
Thu Apr 25 2024, 08:44 am
ztaletpzca
Wed Apr 24 2024, 11:19 pm
IrardlPex
Wed Apr 24 2024, 08:42 pm
Charlestehed
Wed Apr 24 2024, 05:20 pm
Robertgurse
Wed Apr 24 2024, 02:43 pm
Richardedils
Wed Apr 24 2024, 04:07 am
Malcolmaccek
Wed Apr 24 2024, 01:21 am