a control circuit for a joystick includes two dual input nand gates having one of their inputs connected in common . a potentiometer has a wiper connected to the common nand gate inputs and has two end terminals each connected to the output of a different nand gate . a capacitor couples the wiper to ground potential . the control circuit produces a pulsed output signal from one nand gate when the wiper is moved in one direction from a central position and a pulsed output from the other nand gate when the wiper is moved in the other direction . the frequency of each nand output signal varies in relation to the distance that the wiper is moved from the central position .