Electronic latching device

Claim 1

A switching circuit for use with a radio frequency tuner employing a voltage variable reactance tuning element, including a plurality of means for supplying an adjustable voltage to said voltage variable reactance so that said tuner can be adjusted to any one of a plurality of frequencies at will by actuating one of a plurality of momentary contact switches, said circuit comprising: a. a source of regulated direct current; b. a plurality of electronic latching circuits, each latching circuit containing a momentary contact push button switch, a potentiometer, and active circuit elements connected to provide two stable electrical states, an ''''on'''' state wherein said potentiometer is connected through said active circuit element to said source of regulated direct current, and an ''''off'''' state wherein said potentiometer is isolated from said source of regulated direct current, said on state being actuated by said switch; c. means common to said plurality of electronic latching circuits and responsive to the actuation to the ''''on'''' state of a selected one of said latching circuits for actuating the ''''off'''' state in non-selected latching circuits; and d. means for connecting said potentiometers to a common output line while isolating from said common output line all potentiometers associated with a latching circuit in the ''''off'''' state.