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Help me build a doppler shift demonstrator

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Vicountboo

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Doppler Demonstrator

Hi

I am undertaking a project to build a system demonstrating the doppler shift. A transmitter is to be built and embedded in a sponge ball and an audio receiver will receive the signal & measure the frequency and display the result.
Can anyone please suggest any steps to be taken?
Thanks
 

Re: Doppler Demonstrator

The transmitter is simply a oscillator loaded with loudspeaker. Receiver is something like microphone preamplifier, filter, amplifier and measuring unit. The filter should be bypass one, with center frequency of transmitter and narrow bandwidth, mating with possible doppler shifts. After the filter, an amplifier should be implemented to amplify the signal to a level, acceptable to measuring unit. The measuring unit may be the simply frequency-to-voltage converter, like monostable and DC meter. Or, it may be the PLL-type device.
Sorry for being too common, but it is always difficult to describe global projects in few lines.
 

comparing the moving sound with a steady stationary source would be easier and might be more impressive, ears are very good at picking up beat frequencies.

even simpler might be to swing a loudspeaker around your head at the end of a wire. as the wire gets longer the rise and fall of the source frequency gets more noticable, demonstrating doppler shift
 

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