This 2003 circuit does not transport any passengers, it only synthesizes a sound almost identical to that of a motorcycle, with some special effects such as a headlight that increases and decreases brightness when accelerating and decelerating. The potentiometer must have a spring for automatic return to return to idle. The tachometer is mounted with a VU-meter to accompany the accelerator variations. We also have an oscillator per phase rotation formed by the components around T1, which when pressing S2 produces a high-pitched whistle in the speaker, along with the motorcycle sound. S1 is a lever switch next to the 4.7 k ohm (linear) potentiometer that serves as an accelerator. When switching on S1, we immediately have the motorcycle noise emission, which can be accelerated in P1.
