Teardown of a Static fieldmeter

A teardown of a Static fieldmeter from Kerry Wong: Static fieldmeters (or electrostatic fieldmeters) are typically used for non-contact measurements of the electrostatic field strength (usually in kV) of charged objects. These are highly specialized test instruments and most hobbyists probably seldomly have the opportunity of coming across one. So in this…... [Continue...]
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Safely Remove Drill Chuck; Receive Motor, Gearbox, and Clutch

There’s a treasure trove of usefulness inside of an electric drill. [Steven Dufresne], Hackaday writer and the mad scientist behind Rimstar.org, kindly documented how to safely and reliably remove the chuck from a drill motor. You may think this is easy, but once in a while you’ll come across a…... [Continue...]
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Ducklings Raised by Remote

We’re not sure that it’s absolutely necessary to raise ducks using a remote-control animatronic duck decoy, but people have stranger hobbies. This YouTube video (embedded below) from [Imaginative Guy] chronicles an impressive feat of RC animatronics, sparing no effort to make the RC duck “parents” realistic. There’s a ton of…... [Continue...]
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Hackaday Prize Entry: An Electric Bike And A Dashboard

Over the last few years, powerful brushless motors have become very cheap, batteries have become very powerful, and the world of quadcopters has brought us very capable electronic speed controls. Sounds like the perfect storm for a bunch of electric bike hacks, right? That’s what [bosko] is doing for his…... [Continue...]
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Soft Robot With Microfluidic Logic Circuit

Perhaps our future overlords won’t be made up of electrical circuits after all but will instead be soft-bodied like ourselves. However, their design will have its origins in electrical analogues, as with the Octobot. The Octobot is the brainchild a team of Harvard University researchers who recently published an article…... [Continue...]
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Water-Cooled LED Light

[Matt] wanted to drive a Yuji LED array. The LED requires 30 V and at 100 watts, it generates a lot of heat. He used a Corsair water cooling system made for a CPU cooler to carry away the heat. The parts list includes a microphone gooseneck, a boost converter,…... [Continue...]
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Tracking Airplanes From An Autonomous Boat

Airplane tracking systems like FlightRadar24 rely on people running radios that receive the ADS-B signal and forward the data on to them. That doesn’t work so well in the middle of the ocean, though: in spots like the mid-Atlantic, there are no islands to speak of. So, the service is now…... [Continue...]
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3D Printering: XT-CF20 Carbon Fiber Filament Review

ColorFabb’s XT-CF20 is one of the more exotic filaments for adventurous 3D printerers to get their hands on. This PETG based material features a 20% carbon fiber content, aspiring to be the material of choice for tough parts of high stiffness. It’s a fascinating material that’s certainly worth a closer look. Let’s check it…... [Continue...]
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PRU tips: Understanding the BeagleBone’s built-in microcontrollers

Ken Shirriff writes, “The BeagleBone Black is an inexpensive, credit-card sized computer that has two built-in microcontrollers called PRUs. While the PRUs provide the real-time processing capability lacking in Linux, using these processors has a learning curve. In this article, I show how to run a simple program on the…... [Continue...]
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The Quantum Eraser

Richard Feynmann noted more than once that complementarity is the central mystery that lies at the heart of quantum theory. Complementarity rules the world of the very small… the quantum world, and surmises that particles and waves are indistinguishable from one other. That they are one and the same. That…... [Continue...]
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Raspberry Pi Walkie Talkie Mumbles To Friends

His kids wanted walkie talkies, so [Daniel Chote] built one. The TalkiePi is a neat project built around a Raspberry Pi running Mumble, the open-source voice chat system that his kids can share with their siblings and friends. It’s easy enough to choose the Raspberry Pi, and Mumble is pretty well…... [Continue...]
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Cheap Toy Airboat Gets a Cheap R/C Upgrade

[Markus Gritsch] and his son had a fun Sunday putting together a little toy airboat from a kit. They fired it up and it occurred to [Markus] that it was pretty lame. It went forward and sometimes sideward when a stray current influenced its trajectory, but it had no will…... [Continue...]
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VHF Frequency Counter with PC Interface

Scott has published a new build: This is the general idea behind how this frequency counter works. It’s so simple! It’s entirely digital, and needs very few passive components. sn74lv8154 is configured in 32-bit mode (by chaining together its two 16-bit counters, see the datasheet for details) and acts as…... [Continue...]
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Hackaday Prize Entry: Adblock For TV

Contact, the 1985 book by Carl Sagan, was significantly better than the movie. Five people went through the wormhole, three machines were made (in Russia, Wyoming, and a third on Hokkaido), Erbium did something, and the novelization provided much better worldbuilding. One of the more interesting characters in the book was…... [Continue...]
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Wooing A Lady Into Persisting with Persistence… of Vision

As the story goes, years ago [Matt Evans] was wooing the beautiful and talented [Jen]. There were many suitors vying for her hand; he would have to set himself apart. The trouble was, how to convince her that persisting in the relationship was the best and only course? What did…... [Continue...]
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Vintage 16mm Film Editor Is Now Retro Arcade

When [Douglas Welcome] found a disposed Kalart Craig 16 mm Projecto-Editor on the curb, he knew it was destined for retro-greatness. This vintage looking device was once used to view and cut 16 mm film strips, and still in mint condition, it was just too cool to pass up. With help of…... [Continue...]
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Bicycle Seismograph Measures The Streets

Riding the streets of the Netherlands on a bicycle is a silky-smooth experience compared to doing the same on those of Germany. So says [Kati Hyyppä], who made the move with her trusty Dutch bike. The experience led her to record the uneven cobblestones and broken asphalt of the German roads…... [Continue...]
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