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

Lewisuhakeply
Thu Apr 18 2024, 06:00 pm
Darrellciz
Thu Apr 18 2024, 11:07 am
Charlessber
Thu Apr 18 2024, 09:29 am
BartonSem
Thu Apr 18 2024, 04:56 am
DonaldKnown
Thu Apr 18 2024, 12:24 am
utaletxcyw
Wed Apr 17 2024, 10:21 am
Anthonyvab
Wed Apr 17 2024, 08:48 am
RobertCix
Wed Apr 17 2024, 06:46 am