If you’re recovering from a respiratory problem, chances are you may have had your oxygen levels checked with a pulse oximeter. Pulse oximetry is the non-invasive measurement of the oxygen saturation (SpO2). Oxygen saturation is defined as the amount of oxygen dissolved in blood, based on the detection of Hemoglobin, Hb, and Deoxyhemoglobin, HbO2. The […]
Teardown: Induction crystal ball gyrocopter toy
A little toy made in China called the Induction crystal ball uses a pair of coaxial rotors to rise in the air, helicopter-like. It powers the rotors enough to rise for a few seconds, then cuts the power back to gently float down until a proximity sensor in the base of the plastic body comes […]
Teardown: Dr. Pocket TENS therapy pain relief kit
The electronic TENS (transcutaneous electrical nerve stimulation) therapy pain relief kit called Dr. Pocket uses electronic pulse stimulation via TENS to deliver electric impulses through electrodes in a pad that sits on the user’s skin. This device has multiple modes of different pulse frequencies covering transcutaneous electrical nerve stimulation and powered muscle stimulation which are […]
Teardown: Inside a cable modem
The device which brings cable TV and high-speed internet into homes has a simple design but sports a couple of tricky secrets. Lee Teschler Executive Editor If you’ve got broadband internet from a cable company, it comes into your house through a cable modem. Estimates are that some $8.6 billion-worth of cable modems will be […]
