Switching and control device for noise and rumble filters - has slide switch with filters and out positions and giving variable control of noise filter

摘要

The noise and rumble filter switch and control is for radio and audio equipment. The switch is a slide switch(3). In its first position neither the noise nor rumble filters are switched in. In the second position of the switch both filters are switched in. When the switch(3) is moved further to a third position, the rumble filter is switched in, and the noise filter is gradually switched off. An associated circuit includes a high-pass and a low-pass RC T network connected in series and across the base-emitter junction of an amplifying transistor.