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

ManuelInvof
Mon Jan 30 2023, 03:59 am
JosephMuh
Mon Jan 30 2023, 03:22 am
Ocuprimetal
Sun Jan 29 2023, 01:29 pm
YmondPex
Sun Jan 29 2023, 02:06 am
MpestoPex
Sun Jan 29 2023, 01:57 am
PencPex
Sun Jan 29 2023, 01:35 am
volkovch
Fri Jan 27 2023, 05:50 am
Michailadz
Fri Jan 27 2023, 01:39 am