How to make stethoscope model
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Stethoscopes are used to listen to a person's heart. We can make a very basic stethoscope easily using just a cardboard tube, tape and a funnel.
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Cover the top of a funnel with a balloon. Cut the tail-end of a balloon off, then pull it over the larger opening of a funnel. Pull it tightly enough so that it is stretched taut over the funnel, like a drum.[1]
You can use any size of funnel you want, but a smaller funnel will be easier to work with. Something around 3 inches (7.6 cm) wide would be ideal.
If you can't get a balloon or fit the balloon over the funnel, use a sheet of plastic wrap instead.
Wrap electrical tape around the balloon to hold it in place, if needed.
Stick the end of the funnel into a piece of clear, flexible, plastic tubing.
hope it helps you
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