Can I make my electric moped/scooter sound like the Jetsons' air car, in response to speed or throttle?

What a great idea. If you listen closely you can hear that the sound is made up of two sounds. A low end drone that varies in pitch slightly and a high pitched envelope that pulses and sounds squeaky.

Making the low end drone could be done with a 555 that gets its rate changed based on the speed. You would have to experiment with values but this circuit (just one of the 555's) is probably a good start. hackingbynight.wordpress.com/2008/12/21/... 50K pot would have to be replaced by a circuit that varied its resistance based on your sensor for detecting speed change - but if you hooked a variable resistor directly to the throttle you could use it as-is.

The second sound is trickier. You could use two 555s. One making the high pitched squeal and the second pulsing that squeak by gating it (see same diagram above) Both could be controlled as the speed changed.

A second approach would be to try to make the sounds on your PC and sample them into a sound sampling chip. Then hook playback of the sounds up to your speed sensor. This would save having to make the sounds up using circuits.(see Chipcorder below)A third approach would be to incorporate a simple micro to act as the interface between sensor and control of the sounds.It could do more or less work as you decided which parts to do in code and which in analog.

An Anduino or a PicAxe would be good choices. Choosing an approach - or a mixture of them depends probably on which part of all this interests you the most. The 555 is the simplest way to start.

If you are successful - you will also need a simple amp to make it loud enough to really annoy everyone around you and drown out the sound of the actual motor. I recommend the T class amps based on the TA2020 are good for this kind of application and are available on ebay for from 10 to 20 USD from Asia.

The engine noise is made by a small looping audio sample with the playback rate being speed up or slowed down dependent upon the engine speed. This is a very common way of generating engine noises. The sample itself seems to be a quick simple frequency sweep from low to high, followed by a slower sweep from high to low, with a couple basic effects applied.

The original sound was probably made on a keyboard synth, and someone with a decent synth should be able to replicate something close without too much work. Alternatively, with a bit of work, the sample could be captured from an audio clip of the show if a suitable enough clip was found. Real time synthesis would of course be possible, but without much audio knowledge it would be a lot more difficult.

Outputting audio data is easier than you think. Raw pcm audio data is essentially just a list of voltage levels that are output at a regular interval. Assuming you are implementing this with a microcontroller you would have a loop that on a regular interval would output the next sample value to a cheap DAC with the DAC's output hooked up to some amplified speakers, and then change the update rate of the loop dependent upon the speed of the bike.

G'Morning Alex. You should be able to take the output from the speed sensor and feed it nto a standard analogue amplifier and loudspeaker. You should measure the sensor output first so you can match it to the amp input, and you can experiment with capacitor smoothing of the input to get an acceptable sound.

Maplins have several amp modules and kits, one of which may suit. JohnP.

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