Building an audio box out of thrown away boards

The last time [Mark] was at the scrap yard, he managed to find the analogue input and output cards of an old Akai DR8 studio hard drive recorder. These cards offered great possibilities (8 ADC inputs, 12 DAC outputs) so he repaired them and made a whole audio system out of them.

The repair only involved changing a couple of low dropout regulators. Afterwards, [Mark] interfaced one of his CPLD development boards so he could produce some sine waves and digitize signals generated from a PC based audio test unit. He then made the frame shown in the picture above and switched to an Altera Cyclone IV FPGA. To complete his system, he designed a small board to attach a VGA screen,  and another to use the nRF24L01 wireless module.

Inside the FPGA, [Mark] used a NIOS II soft core processor to orchestrate the complete system and display a nice user interface. He even made another system with an USB host plug to connect MIDI enabled peripherals, allowing him to wirelessly control his creation.

75 Controllers, One Gaming System

Multi Video Games System

This gaming cabinet lets two players select games from a wide array of consoles and play them using the original controllers. [Patrice] built it around his Multi Video Games System 2, which converts each of the 75 controllers to a common format. Players pick controllers from the display case, plug in an  HD-15 connector, and choose the game they want to play. The cabinet contains a PC that runs a variety of emulators, and uses HyperSpin as a menu system.

Using adapters, the converted controllers can also be used on other game systems, tablets, or smartphones. [Patrice] claims that they’ll work across 110 different game systems. A full list of the controllers and systems is shown here.

This cabinet is definitely one of the most comprehensive video game installations we’ve seen, and the display case of controllers looks fantastic. Check out a video of the system and some controller porn after the break.

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Vacuum pressure bazooka


This vacuum pressure cannon is a design unlike any we’ve seen before. At first look it seems to have the components you see in a potato gun. But those use a combustion process to launch the projectile. This instead uses the sudden release of a vacuum.

About three minutes into the demo video below we get a look at the “ignition” system. It’s pretty scary in that a couple of really powerful springs are pulling a collar along the barrel toward your face. This is actually meant to dislodge the plug in the back which is holding vacuum in the barrel. The pressure difference causes a sudden inrush of air which shoots the 1.5 inch projectile out the front of the bazooka.

[Mr. Teslonian] built his own hand powered vacuum pump for loading the weapon. This was done with a pair of PVC pipes that fit inside of one another, and a plunger made from wood and leather. The PVC and wood projectile seals in the barrel using a skirt made from duct tape. After breech loading the projectile and plugging the back of the barrel, he layers aluminum foil over the business end and pumps up a high vacuum. His test firing is not from the shoulder, and he only gets one shot because the slug hit the target so hard it was destroyed. This thing really needs to be vehicle mounted!

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Evalbot as a JTAG programmer


[Adarsh] needed a JTAG programmer to push code to a CPLD dev board he was working with. He knew he didn’t have a dedicated programmer but figured he could come up with something. Pictured above is his hack to use a Stellaris Evalbot as a programmer.

Long time readers will remember the Evalbot coupon code debacle of 2010. The kits were being offered with a $125 discount as part of a conference. We were tipped off about the code not know its restrictions, and the rest is history. We figure there’s a number of readers who have one collecting dust (except for people like [Adam] that used it as a webserver). Here’s your chance to pull it out again and have some fun.

A bit of soldering to test points on the board is all it takes. The connections are made on the J4 footprint which is an unpopulated ICDI header. On the software side [Adarsh] used OpenOCD with stock configuration and board files (specifics in his writeup) to connect to the white CPLD board using JTAG.

3D Printering: Scanning 3D models

The Makerbot Digitizer was announced this week, giving anyone with $1400 the ability to scan small objects and print out a copy on any 3D printer.

Given the vitriol spewed against Makerbot in the Hackaday comments and other forums on the Internet, it should be very obvious the sets of Hackaday readers and the target demographic Makerbot is developing and marketing towards do not intersect. We’re thinking anyone reading this would rather roll up their sleeves and build a 3D scanner, but where to start? Below are a few options out there for those of you who want a 3D scanner but are none too keen on Makerbot’s offering.

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An absurdly small tri-copter


The team behind the Femtoduino – an extraordinarily small repackaging of the Arduino – sent in a few videos from YouTuber [phineasIV], a.k.a. [Eric] that shows one of the smallest multicopters we’ve ever seen.

Because this isn’t a traditional quad or hexcopter, the control system is a little weird. Two of the motors and props are fixed along the vertical axis, while the rear prop is connected to a small servo to rotate from side to side. Still, the electronics are fairly standard for any multi rotor vehicle – a triple-axis gyro provides the stability of the vehicle coupled with MultiWii, while an amazingly small servo receiver, Bluetooth module,, Femtoduino, and a trio of brushless ESCs tie everything together.

The end result is a tri-copter that weighs about the same as the Crazyflie Nano Quadcopter, but is just a bit smaller. As impressive as it is on video (seen below), we’d love to see this tiny robotic hummingbird in person.

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