DIY Seismic detector
Design news latest “Gadget Freak” has a great how-to on making your own seismic detector – Like Jack Godell’s coffee in “The China Syndrome,” the fluid in William Grill’s Seismic Detector reveals subtle vibrations. The entire detector is built around a laser pointer, a few hobby-type mirrors, a PIN photdiode, regulator and amplifier, enclosed in […]