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Cordless Phones

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How PBX Works

How PBX Works

 

Handset

You can carry the handset with you throughout the house or outside within the range of the base transmitter. The handset has all of the equipment of a standard telephone (speaker, microphone, dialing keypad), plus the equipment of an FM radio transmitter/receiver.


Block diagram of handset components

When you open up the handset, you see these components:

         speaker - converts electrical signals into the sound that you hear

         microphone - picks up your voice and changes it to electrical signals

         keypad - input for dialing

         buzzer or ringer - lets you know that you have an incoming call

         radio components

         amplify electrical signals to and from microphone and speakers

         send and receive FM radio frequencies

         LCD or LED displays - indicator lights

         re-chargeable battery - supplies electrical power to handset


Parts of the GE cordless phone's handset, showing the fronts of the circuit boards

 


Parts of the GE cordless phone's handset, showing the backs of the circuit boards, the speaker, microphone, ringer and battery

Speaker
The speaker receives the electrical signals from the audio amplifier in the radio components and converts them into sound. When you remove the cover from the speaker, you see a large round permanent magnet with a hole in the middle and a deep groove surrounding the hole. Within this deep groove is a coil of fine copper wire that is attached to a thin plastic membrane. The plastic membrane covers the magnet and coil.


Close-up view of the speaker in the GE cordless telephone handset

 


Close-up of the speaker with the top removed

 


Close-up of the speaker with the plastic membrane and attached coil lifted out. The large metal disc is the magnet.

 


Close-up of the speaker's plastic membrane with attached wire coil

To hear sounds, the following events happen:

1.    Electrical signals come from the radio components.

2.    The electrical signals travel in the coil of copper wire.

3.    The electrical signals induce magnetic currents in the coil of wire, thereby making it an  
  electromagnet.

4.    The electromagnetic coil moves in and out of the groove within the permanent magnet.

5.    The coil moves the attached plastic membrane in and out at the same frequencies as the
  changes in electric currents.

6.    The movements of the membrane move air at the same frequencies, thereby creating sound
 
waves that you can hear.

 
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