Geophone Seismic Kit

They’re baaaacccckkkk!  The Geophones are back.  What’s a geophone? Well, it’s an electronic receiver designed to pick up seismic vibrations. That means we have the main ingredient for an exciting kit. Ultra-sensitive geophone circuit "listens" to vibrations in the ground. You can place this kit outside and watch the changing LEDs to see if there is someone or something coming. The closer it gets, the higher the LED reading. In our experiments, we mounted the geophone on a board and covered it with dirt outside a window. Some pretty interesting observations were made when cats, dogs, or people walked by. You can even build your own seismograph. Great for amateur seismologists. Adjustable sensitivity. 10 LEDs indicate signal strength. Geophone sensor is 1-1/4" in diameter X 1" tall. These geophones are used but they are re-certified at the factory and guaranteed. Comes with 9 volt battery clip for portable operation. 9V battery(not supplied). Amazingly sensitive. Use LED outputs to trigger other devices, such as relays, lights, sirens, trap doors, net launchers, etc. Kit actually comes put together. All you have to do for operation is add power to the board(3-25Vdc/100mA) and wires to the geophone sensor, then go looking in the deepest darkest extremeties for unkown sounds.