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!
Amazon’s Audible is hands-down the most popular place to find audiobooks. With its library of over 180,000 books, Audible has the biggest audiobook selection in the world, and a membership gets you a free book each month. You can sync Audible across multiple devices, so you’ll never lose your spot whether you’re on your computer or your phone.This […]
#1. A-Audio Legacy Noise Cancelling Headphones with 3-Stage Technology The A-Audio Legacy Headphones are the Boing Boing Store’s best seller this month, and it’s easy to see why. With 40mm drivers, powerful circuitry, and memory foam padded circumaural ear cups, these are clearly super high-quality headphones. Plus, the patented 3-Stage Technology lets you toggle between passive […]
Vaping is getting more mainstream by the day, which means there’s been an influx of quality yet affordable vaporizers on the market. We’re particularly excited about the APX Wax Vaporizer Kit, which is an easy-to-use, high-quality vape that works with both dry herbs and waxy concentrates.If you’re a beginner trying to get into vaping, the APX […]