January 28th, 2009

Monome with Arduino

Arduino monome

First of all for those who don’t know, the monome is a music controller which is used to generate sound effects, is has a lot of push buttons which have different color back lights to generate a visual effect to. DJ’s VJ’s use the commercial version, but there are also available DIY kits, open source open hardware designs, the most simple is to use the Arduino with the monome shield, but you can build your custom shield or entire system.

The basic functions are, use a large keyboard matrix, with back lit buttons and based on the sequence which the user pushes the keyboard generate a MIDI output which is interpreted by a mixer or synthethizer.

The sound and visual effects can be customized if you build your own monome, most of the parts can be bought from Sparkfun, including the pcb’s, although there are open source projects, the programming part is not for beginners and you need some external MIDI interpreter which can be expensive.

Monome with Arduino: [Link]

October 28th, 2008

MOSFET Headphone Amplifier

MOSFET Headphone Amplifier

As we all know headphone amps are not cheap to buy. I think this is the main reason that drives the hobbyist to make their own amps. Most people are familiar with the popular C’Moy headphone amp which is cheap to make and it sounds nice.

But there also other designs available, for example this class A MOSFET headphone amp. The author designed and build it because he’s 32 ohm Grado SR80 headphones didnt’t sound good on it’s computer soundcard.

An IRF610 MOSFET was used by the author but there is a wide variety of FET devices that can be used instead. Unlike the C’moy amp this amp was primarily designed to sit on a desk, it’s bigger the MOSFET needs heatsink cooling so this wouldn’t fit the portable category of amps.

A LM317 regulator is used for the constant current source, and the current is limited to about 250mA. In the end the sound is better than on the sound card and it was a small investment as most parts were salvaged.

It’s not too difficult to build something similar but it will sure help to have some experience with similar circuits.

MOSFET Headphone Amplifier: [Link]

October 28th, 2008

DIY Game Boy

diy-game-boy

DIY game console ? there are not many projects out there on this subject, mainly because of the ammount of work and time you have to put into something like this.

Matt, the author of the DIY Game Boy, got over this issues and manged to get it done. The core of the project is an Arduino that controls all the other modules.

There is very little soldering requiered on this project as it’s mainly constructed using modules and shields. The source code is posted on the project page so you should have no problem on making something similar.

DIY Game Boy: [Link][via]

DIY Single Transistor Tesla Coil

This tutorial will guide you when building your own single transistor tesla coil. We’re all fascinated by the sound produced when high voltage is discharged so sooner or later you’re gonna want to build it. Apparently using a single transistor it’s better and the whole thing works better.

DIY Single Transistor Tesla Coil: [Link][via]

Class A Headphone Amplifier Boost Your Sound

This is a simple do-it-yourself (DIY) headphone amplifier project that is fashioned primarily after the Class A MOSFET Headphone Driver project by Greg Szekeres and to some extent Mark’s DIY Class A 2SK1058 MOSFET Amplifier Project. The amplifier concept is simple and follows a typical single-ended class A circuit utilizing an active constant current source (CCS) in place of a passive resistor. A CCS doubles the efficiency of the circuit over that where a passive load resistor is used, bringing it to a maximum of 25%.

Class A Headphone Amplifier Boost Your Sound: [Link][via]



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