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Any 5 gallon plastic bucket can be turned into a sensitive seismograph.
Page under construction. 02-27-2021.
With just a few extra parts, and some construction, you can have this seismograph working in less than 2 hours of build time.
A small dish of water shortens the time it takes for the seismograph to stop swinging after detection. Olive oil can also be used for quicker settling time.
Run a cable from the sensor's two wires to your data logger.
Black is signal ground. Red or White goes to the input.
You can tune the sensor. 66 uF tunes to 7 Hz, allowing detection of higher frequency vibrations.
The swing frequency of your mass will be around 1 Hz, so you will see both high and low frequencies.
To tune closer to 1 Hz, use a 100 uF capacitor across the sensor wires.
You can use the sensor untuned, but the capacitor gets rid of potential out of band electronic noise.
Its easy! Just connect the sensor directly to a PC data logger having millivolt input sensitivity for instant operation! No other amplifiers or power supplies or batteries! ELF waves are too low for human hearing, so it is best to view them on a PC chart-recorder.
Set your recorder's sample rate at 20 samples per second, this will allow viewing waves up to 10 Hz.
We suggest using the model # Di-2008 data logger from www.dataq.com.
This data logger can be setup to record new 24 hour long files, saving the file names automatically as the new date. This makes it easy to find recordings of daily events.