Is it possible

Ken_tn

· Ok, I am nuts, but I was reading that you can make a simple seismograph using just speakers. The idea is that speakers contain a coil and any vibration will cause the speaker to generate a small voltage. In the project I read they said that voltage could be detected by using the pickup on a cassette player read/write heads. My question is. Is there enough voltage there to be detected by a basic stamp? If so any ideas on how to read that voltage?

Thanks In Advance For Any Ideas

skylight

You are correct that a speaker can be used as a microphone although it will be highly inefficient, you would need a great deal of amplification (if possible?) to achieve a connection with a stamp to record any small tremors, might be lucky(or not) if you are at the epicentre of a major earthquake.

Jonathan

Ken,

I've fooled around with several seismographs. Almost as simple and far more efffective is a super mangnet suspended over a coil, like a coil from a 120VAC relay. You can hang it with string, or better yet some sort of solid bar (wood dowel for example). You can also experiment with dampening using a chunk of aluminum or copper (or any non-ferrous metals). I think you'll have better luck with this method. One siesmograph I made could detect the ocean waves (during a big storm) hitting the beach about 4 miles away.

Jonathan

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$WMc%

Take a look at this months nuts&volts magazine. (June 2010). Pg 33

This uses a LDT0-0128K Piezo Vib.Detector and a MCP601 amp. This should be pretty easy to integrate to a BS2

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