TOUCH TUNING AND CONTROL CIRCUITS

摘要

An electronic circuit for adjusting the volume and tone of an audio signal is controlled by appropriately bridging contacts included therein with a human finger or other conductive means. The length of time that a contact is bridged, or closed, determines the conductive state of a field effect transistor associated therewith. One such FET controls the gain of an audio amplifier whereby the amplitude of the audio signal is controlled. The conductive state of a second such FET controls the biasing voltage on a junction transistor to control the shunting of the high frequency components of the audio signals.