Have you been dying to record some of your phone conversations for those podcasts or homebrewed movies or crazy flash animations you make? Wait no longer! Build yourself a little circuit to change ...

This produces variations in the strength of the electrical current traveling through the telephone circuit which are precisely the same as the variations in the vibrations of your voice.

The circuit extended the detection range of the ... These sensors are there to tell the phone whether the phone is being held up to your ear, for instance. Of course, if the IR emitter in the ...