Here's a HOWTO for building your own electrocardiograph -- many such plans exist, but this one lowers the cost and part-count by ingeniously repurposing the sound-card from a PC.
Digitization: Once amplified, the ECG signal along with a bunch of noise is in analog form. You could display the output with an oscilloscope, but to load it into your PC you need an analog-to-digital converter. Don't worry! If you've got a sound card with a microphone input, you've already got one! It's just that easy. We'll simply wire the output of our ECG circuit to the input of our sound card, record the output of the op-amp using standard sound recording software, remove the noise from the ECG digitally, and output gorgeous ECG traces ready for visualization and analysis!
Is your brain a machine? Are your thoughts and feelings just malware of the mind? (And what “really” is a machine, anyway?) John and Eva referee the transhumanist fight of the century. In the blue corner, we have Eva meeting founder and Bryan Johnson, CEO of Kernel, straight from his office in LA. And in […]
For some children with severe epilepsy, the best treatment may be a very rare surgical procedure in which a large portion — even half — of the child’s brain is removed or disconnected. Amazingly, many of these individuals can relearn motor, language, and cognitive skills. How? The brain reorganizes itself and builds new connections. To […]
This video depicts light speed in contexts where it appears to be slow. The moon is 1.2 light seconds from Earth; Mars several light minutes. This is, of course, why humans aren’t moving out of this solar system any time soon.
The hardest part of web design can be nailing down the look. These days, even non-designers can easily spot a stale stock photo or lazily-made icon. What’s the solution? No matter what kind of artist you are, it’s always a good idea to widen your palette. And with more than a million vector images to […]
For all that tech that gets squeezed into them, the best wireless earbuds are ones we barely have to think about. That’s the whole point, right? We get wireless because we just want to hit play and have a hands-free, cordless soundtrack for the rest of the commute. If that’s your philosophy, definitely give these […]
Need a boost on that resume? Get a valuable tech education on your own time with these eBook bundles. They contain guides from Packt Publishing that cover everything from game development to machine learning. The Complete Mobile App Developer eBook Bundle It’s a veritable gold rush in the App Store these days. Get in on […]