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Discussion Starter · #1 ·
It's fairly trivial to use a wheel speed sensor (reed switch and magnet) to drive a multivibrator.

Hook this up to a tone generator, and you will efffectively be able to create a tone that varies with the speed of the car.

Adjust the volume as desired and the effect is that you have an electric car that sounds more like what people are trained to hear.

Other similar permutations include using an LC circuit or 555 timer so that an audible signal is only generated above certain velocities, interfacing it with a manual foot switch, etc.

I'm an ME. A EE type person should be able to whip this up in under 10 minutes, even with a few adult beverages under their belt.
 

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don't cut
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4,075 Posts
Safety problem. When operating in full electric mode, the Prius (I am spelling that wrong I think) is so quiet that spectators were stepping out in front of it.
Richard
 
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