Elektrosluch – Listen to EMI

Elektrosluch completeMAKE recently featured a very cool project that I had to build: the Elektrosluch! What’s an Elektrosluch? It’s basically a microphone of sorts that allows you to listen to electromagnetic interference (EMI) which is found all around us in our personal electronics, homes, automobiles, and many other places. The Elektrosluch includes a built-in amp, so listening can be done with headphones, or it can be connected to a recording device for sampling. The tutorial was written by Jonas Gruska, who designed the circuit. It was a lot of fun to build, and overall not too hard. I took my time and checked everything several times and it worked the first time I tried it.

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Infrared Pulse Sensor

IR pulse sensor and oscilloscopeLast week, I bought something I’ve wanted for quite some time: an oscilloscope. I’ve been doing more projects where a scope would be useful, such as audio amplifiers, PWM, and AC-DC rectification. And besides that, oscilloscopes are just plain cool. Of course, a scope by itself isn’t much fun, it needs something to measure. Something like an AC sine-wave, or an audio signal, or maybe… a person’s pulse rate? It’s possible, with the right sensor. Sean Michael Regan shows us how in the latest MAKE Weekend Project. I knew right away that it was perfect for trying out my scope. It was a bit of work, primarily because I modified the circuit, but the finished sensor is a lot of fun, and there is a lot of potential for doing more with it.

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Japanese Toolbox

Japanese Toolbox completeOftentimes, I find myself going to my parents’ house or a friend’s place to build or repair something, and I have nothing to put my larger tools in.  As a result, my drill, saw, clamps and other large items end up either laying on the floor of my truck or stuffed into whatever cardboard box I found laying around.  If I had a large, sturdy box to throw this stuff in, it would make these trips much more convenient and I would spend less time loading and unloading my tools and more time working.  So when I saw Len Cullum’s Japanese Toolbox project in MAKE 34, I knew I had found my solution.

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Monobox Ammunition Can Amplified Speaker

Intro

I was looking for an electronics project I could build after teaching myself to solder (by building alot of Velleman 3D Christmas trees) when I came across Ross Hershberger’s Monobox amplifier project.  Right away, I knew I had to build this.  I tried to find a cigar box that would work, but didn’t have much luck.  But then I remembered that I had some old ammunition cans laying around, and inspiration struck.   It was a fun project that came out great, and I continue to enjoy it as it makes a great companion for my iPod.

This project was featured on the Make Blog: MonoBox Mods: Same Circuit, Two Builds.  Read on to learn what parts I used, some of the difficulties I ran into, and to see a video of the finished ammo can amp.

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