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Make a Heartbeat Detector With an Op Amp

diy-ecg-pulse-oximeter-lm324-opamp-sound-card-525x393

Scott Harden’s DIY electrocardiogram (ECG) uses a LED shining light through his finger into a photo transistor, with the resulting signal amplified with a LM324 quad op amp. The goal of this project is to generate an extremely cheap, functional ECG machine made from common parts, most of which can... Read more »

Your Favorite Tools, Part 2

"Bought this guy over 10 years ago.   Scales are long gone, spring for the pliers and scissors need replacing, it's grimy and notched, nicked and abused.  Still going strong, and if it's not in my pocket I immediately miss it."

Thanks to everyone who sent in e-mails and pictures of their old warhorses and shiny new friends following our last crowdsourced tools collection. Here are a few more of our favorites from among your submissions, as well as some supplemental staff choices, including one of my own, thrown in at... Read more »

Your Comments

make_a_makerspace1

When we post new content on MAKE, we love hearing from our readers. Whether the comments be informative, insightful, or funny, here are our favorites from the past week, from Makezine, our Facebook page, Google+ Community, and Twitter. Read more »

TWiT TV Visits Maker Faire

father with hat

As makers of Maker Faire, it’s always really fun for us to see the coverage that emerges after the Faire. It’s our chance to see the Faire through another set of eyes. Our friends at TWiT TV shared this great in-depth video they made, hosted by Fr. Robert Ballecer, at... Read more »

Mike Ross’ Big Rig Jig

mike ross big rig jig bm2

There are some sculptures that are so unique and visionary, they’re hard to forget. Los Angeles-based artist Mike Ross‘ Big Rig Jig is one of them. Built in 2007, “Big Rig Jig is constructed from two discarded tanker trucks. The work serves both as a sculpture and an architectural space:... Read more »

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