Editing Potentiometer (section)

=== Television ===
Potentiometers were formerly used to control picture brightness, contrast, and color response.  A potentiometer was often used to adjust "vertical hold", which affected the synchronization between the receiver's internal sweep circuit (sometimes a [[multivibrator]]) and the received picture signal, along with other things such as audio-video carrier offset, tuning frequency (for push-button sets) and so on. It also helps in frequency modulation of waves.