Hacked Gadgets Forum

October 3, 2014

Fostex FE206En Back-Loaded Horn Loudspeakers

at 11:57 pm. Filed under Insane Equipment

OLYMPUS DIGITAL CAMERA

 

Check out this crazy internal baffle structure of this cool Fostex FE206En Back-Loaded Horn Loudspeaker.

 “The back-loaded or rear-loaded horn loudspeaker system is like bass-reflex and double bass-reflex speaker types in that the sound radiated from the back of speaker transducer is utilized to enhance the bass response. The difference however is that back-loaded horn (BLH) speaker enclosures make among the most efficient use of the back wave from the speaker driver. The back-loaded horn speaker enclosure operates by developing the bass response using the back wave from the speaker driver and an expanding horn section. The remainder of sound spectrum (mid and high-frequency ranges) is radiated directly from the front wave produced by the speaker driver. Back-loaded horn speaker enclosures are generally amongst the most efficient enclosure systems and respond well to the subtlest components of music signals. For “tighter” sound reproduction, you can reduce the interior volume of the horn speaker cabinet using fill material. Sound absorbing material should be used directly behind the driver and also at the mouth of the horn to smooth out the frequency response.”

 

OLYMPUS DIGITAL CAMERA


September 27, 2014

Murata Cheerleaders

at 1:56 am. Filed under Complex Hacks, Cool Gadgets, Electronic Hacks, Insane Equipment

 murata_cheerleaders

 

Murata is always pushing the envelope when it comes to demonstrating their technology in action. You probably remember the close up look we got of the technology behind Murata Girl and Murata Boy. This time they have made an entire group of robotic cheerleaders who dance in formation. They sit on top of a ball and balance as they are moving around. We have seen balancing ball robots before but the complexity of moving all of these balancing robots in unison must be quite challenging.

You need to see them in action. Click here to see the video, scroll down to see how the technology comes together.

Thanks to Amy from Murata for the info.

 

 


September 18, 2014

MIT Cheetah Robot

at 6:20 am. Filed under Complex Hacks, Cool Gadgets, Insane Equipment

MIT Cheetah Robot_4

 

The MIT Biomimetic Robotics Laboratory has been working hard on the MIT Cheetah Robot. Deborah Ajilo, Negin Abdolrahim Poorheravi,John Patrick Mayo,Justin Cheung, Sangbae Kim, Shinsuk Park, Kathryn L. Evans, Matt Angle, Will Bosworth, Joao Luiz Almeida Souza Ramos, Sehyuk Yim, Albert Wang, Meng Yee Chuah, and Hae Won Park are members of the huge development team. Why so many team members? This is not a simply problem to tackle, as you read through their post you will see that there were a number of challenges that they needed to overcome in the development of the system.

Via: Evan Ackerman at IEEE Spectrum

“Now MIT researchers have developed an algorithm for bounding that they’ve successfully implemented in a robotic cheetah — a sleek, four-legged assemblage of gears, batteries, and electric motors that weighs about as much as its feline counterpart. The team recently took the robot for a test run on MIT’s Killian Court, where it bounded across the grass at a steady clip.

In experiments on an indoor track, the robot sprinted up to 10 mph, even continuing to run after clearing a hurdle. The MIT researchers estimate that the current version of the robot may eventually reach speeds of up to 30 mph.

The key to the bounding algorithm is in programming each of the robot’s legs to exert a certain amount of force in the split second during which it hits the ground, in order to maintain a given speed: In general, the faster the desired speed, the more force must be applied to propel the robot forward. Sangbae Kim, an associate professor of mechanical engineering at MIT, hypothesizes that this force-control approach to robotic running is similar, in principle, to the way world-class sprinters race.”

 

MIT Cheetah Robot_1

 

MIT Cheetah Robot_2

 

MIT Cheetah Robot_3

 

 


August 6, 2014

Vintage Precision Power Supply Teardown

at 6:34 am. Filed under Insane Equipment

 

Our friend Dave from the EEVBlog took apart this Vintage Precision Power Supply. With a quick look at the front panel you might think this is something that you would have got from Radio Shack 40 or 50 years ago for your hobby kit but this is a 0.001% precision power supply! It was designed by Power Designs Inc of New York back in 1964. When you see the internals you will see lots of point to point wiring which was popular back in the day, these days you only generally see point to point components bodged onto cheap Chinese equipment. The condition of the internals is very clean considering the age of the device! Unfortunately a simple adjustment of the trim pots wasn’t enough to calibrate it. I am assuming that some of the crusty old caps are desperately needing replacement.

July 26, 2014

How OSB is Made

at 7:35 pm. Filed under Insane Equipment

 

We use OSB (oriented strand board) for many building projects these days as plywood is getting more expensive. The process of how it is made is quite interesting.

“Oriented strand board is manufactured in wide mats from cross-oriented layers of thin, rectangular wooden strips compressed and bonded together with wax and synthetic resin adhesives (95% wood, 5% wax and resin). The layers are created by shredding the wood into strips, which are sifted and then oriented on a belt or wire cauls. The mat is made in a forming line. Wood strips on the external layers are aligned to the panel’s strength axis, while internal layers are perpendicular. The number of layers placed is determined partly by the thickness of the panel but is limited by the equipment installed at the manufacturing site. Individual layers can also vary in thickness to give different finished panel thicknesses (typically, a 15 cm layer will produce a 15 mm panel thickness). The mat is placed in a thermal press to compress the flakes and bond them by heat activation and curing of the resin that has been coated on the flakes. Individual panels are then cut from the mats into finished sizes.”

 


May 30, 2014

Automatic Fire Fighting Foam Solutions

at 10:06 pm. Filed under Insane Equipment

 

Aircraft hangers are usually very large simple buildings that house millions of dollars worth of airplanes. A small fire can quickly damage the contents of the building. Fuel storage containers are pretty scary when they burn out of control. The key is to have a fast reaction to fire and hit it with an effective suppression material. These videos are interesting due to the large scale. I think they could rent out some of these hangers out as after hours foam rave clubs. :)

 

 

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March 10, 2014

Ping Pong Robot

at 10:28 pm. Filed under Complex Hacks, Cool Gadgets, Crazy Hacks, DIY Hacks, Insane Equipment

 

 If you hate when you don’t have a partner to play ping pong with you why not build a robot. Ulf Hoffmann is an industrial mechanic and has some creative ideas. His Ping Pong Robot (translated) is quite amazing, you can see it in action above. The videos below demonstrate the building blocks to get to where the robot is today.

Via: Laughing Squid

 

 

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