Category Archives: filter

Solving The Mysteries Of Grounding While Improving A Power Supply

Grounding problems and unwanted noise in electrical systems can often lead to insanity. It can seem like there’s no method to the madness when an electrical “gremlin” caused by one of these things pops its head out. When looking more closely, however, these issues have a way of becoming more …read more

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Posted in capacitance, electricity, filter, gremlin, Ground Loop, grounding, inductance, noise, oscilloscope, power supply, teardown | Leave a comment

Fail of the Week: Ambitious Vector Network Analyzer Fails To Deliver

If you’re going to fail, you might as well fail ambitiously. A complex project with a lot of subsystems has a greater chance of at least partial success, as well as providing valuable lessons in what not to do next time. At least that’s the lemonade [Josh Johnson] made from …read more

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Posted in AD8302, Fail of the Week, filter, fotw, harmonics, RF, thesis, vector network analyzer, vna | Leave a comment

I Love the Smell of ABS Plastic in the Morning

One lesson we can learn from the Vietnam War documentary Apocalypse Now is that only crazy people like terrible smells just for fun. Surely Lt. Col. Kilgore would appreciate the smell of 3D printers as well, but for those among us who are a little less insane, we might want …read more

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Posted in 3d printer, 3d Printer hacks, electrostatic discharge, electrostatic precipitator, filter, fumes, health, high voltage, ozone | Leave a comment

Musical Mod Lets MRI Scanner Soothe the Frazzled Patient

Hackers love to make music with things that aren’t normally considered musical instruments. We’ve all seen floppy drive orchestras, and the musical abilities of a Tesla coil can be ear-shatteringly impressive. Those are all just for fun, though. It would be nice if there were practical applications for making music from normally non-musical devices.

Thanks to a group of engineers at Case Western Reserve University in Cleveland, there is now: a magnetic resonance imaging machine that plays soothing music. And we don’t mean music piped into the MRI suite to distract patients from the notoriously noisy exam. The music is …read more

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Posted in exam, filter, gradient coil, Lorenz forces, Magnetic resonance imaging, Medical hacks, midi, modulation, mp3, mri, music, musical hacks, RF | Leave a comment