[Gio] sent in this slick Class A headphone amp. An old CD-ROM case was gutted to hold the goods. The design is fairly simple. Cost can be kept fairly low although the capacitors can add up if you’re a fanatic about quality. If you’ve ever lost any of your headphone gear to sticky fingers, you know that having it blending in to the background can be a great feature.
home entertainment hacks776 Articles
Plants As Speakers
You can make pretty much anything a speaker by vibrating it. Japanese engineer, [Keiji Koga], has been working for many years to perfect his plant based sound transmission system. The voice coil is at the bottom of the plant container and transfers sound up the stalk to the leaves. It’s and interesting idea, but we can’t imagine it sounds much better than vibrating a rigid surface.
[via io9]
PC Interfaced SNES Sound Processor
[Silverpill] sent in this interesting Super Nintendo mod. [Raph] interfaced a SNES audio processing unit to his parallel port using a logic gate and a few resistors. The project looks like it probably died off, but the goal was to use a APU to play authentic audio from emulated games. Schematics and code to get the thing working are all available on the site.
EMS Synthi AKS Teardown
Here’s another bit of analog synth pr0n for you: Initially sold in 1972, the EMS Synthi AKS was a portable modular analog synthesizer with a built in keyboard and sequencer. The VCS 3 portion of the device had a unique routing matrix pegboard used to connect components together. [firegroove] has opened up his precious machine so that you can see all of the fine little bits that make it tick… and chirp.
[via Matrixsynth]
Streaming Netflix To The Xbox 360
We were just as excited as anyone when we heard about Roku’s Linux based Netflix Player, but not being ones to spend money on hardware, even $99, we’d much rather use something that’s laying around that’s not living up to its full potential. Lifehacker has a guide for using vmcNetflix to stream Watch Instantly movies to the Xbox 360. vmcNetflix is a Media Center plugin. When the 360 was originally released, you could only get Media Center by buying a new PC, now it’s included with Vista, meaning people might actually use it.
Tube Amp Monitor
Sparkfun contributor [Pete] really loves tube amps, but he’s a very safety-conscious guy who doesn’t like being electrocuted. This is a problem, since tube amps are usually very high voltage, and a small mistake can be fatal. To deal with this voltage issue, he built a tube amp with a control system built around a 6DOF v3 controller board. The control system is there mainly in case of a failure, automatically shutting off the high voltage transformer in any such event. It has the added benefit of filtering any 60Hz noise from getting into the audio, which happened before he installed the control system.
In addition to regulating power, the controller board also monitors bias points in the output tubes and displays its diagnostics on an LCD. Aside from getting great sound from the tube amp, [Pete] made it look great too, installing colored LEDs under the tubes. We love his design: just because safety comes first it doesn’t mean cool-factor can’t come in a close second.
KT88 Tube Amplifier
Here’s a classic project for the weekend. This KT88 based tube amplifier is surprisingly simple. The parts count is low, but the sound produced by the amplifier is considered quite pleasing. For the budget conscious, there are several optional tubes that can be used in place of the primary KT88.
