INFILTEC: How to Build an Inexpensive Seismometer - make seismograph kit
Geophonic Seismometer – PhysicsOpenLab
How to make a Geophone Vibration Detector - YouTube
Geophonic Seismometer – PhysicsOpenLab
First Homemade PVC Geophone for Earthquakes : 20 Steps - Instructables
Set Up a Geophone with a Raspberry Pi and an ADC (ADS1115) - Tutorial Australia
DIY Geophone | money | This is a very simple DIY project that will save you quite a bit of money. Using parts that you can easily get online for under $50,