1. Telephone Transmitters and Receivers

2. Telephone Transmitters and Receivers
Fig 1: Function of the telephone transmitter

3. Telephone Transmitters and Receivers
Fig 2: The patterns of cardioid and omni-directional
microphones in relation to the direction in degrees

4. Telephone Transmitters and Receivers
Fig 3: Carbon Fig 4: Digital
telephone transmitter telephone transmitter

5. Telephone Transmitters and Receivers
Fig 5: Carbon transmitter varying DC output

6. Telephone Transmitters and Receivers
Fig 6: DC component removed by a transformer

7. Telephone Transmitters and Receivers
Fig 7: DC component removed by a capacitor