In a method for generating a PWM-signal to drive the power transistors of a half-bridge of a converter with the aid of a digital circuit, a digital reference value is compared to the counter content of a digital counting ramp, and a logic state of the PWM-signal is dependent upon whether the reference value is greater than the counter content of the counting ramp. A first end of the first tube is telescopingly received within the third tube and a second end of the first tube is telescopingly received within the second tube. The positioning device is pivotally mounted between the front steering bar and the rear steering bar to keep the front steering bar and the rear steering from pivoting relative to the base. Awards are granted when certain combinations of symbols appear on one or more of the paylines that were selected by the player.