M3 Headphone Amp

March 14, 2008 by 11 Comments


If you’re serious about your headphone amps, you probably already know about the M3 headphone amplifier. Instead of going for the extra tiny, they’re going the ‘screw the size, it’s all about the sound’ route. Thsi thing needs a 24v .5amp power supply. Boards are available, and the discussion has gotten so long on headwize that they exceeded the maximum thread length.

I got busy with the laser last night and came up with something new: a custom etched track pad. It still works, with a bit of added texture where I introduced it to the warm glow of the laser. Hit the link for pics and a walk through.

Contactless Voltage Detection

March 13, 2008 by 17 Comments


[Tim], builder of that sweet NES pad controlled Silvia espresso machine put up an interesting idea for voltage current monitoring – at least, for AC circuits. In a nutshell, he created a mini transformer by wrapping some wire around the outside of one wire of an insulated AC power cord. Espresso machines use 120/220VAC actuated solenoids, so that’s why he’s so interested. I love the idea, since the detection circuit is just a piece of wire.

Underwater GPS (sorta)

March 13, 2008 by 25 Comments


Since water blocks the radio frequency used for GPS triangulation, GPS is considered pretty useless for SCUBA divers. Apparenlty some of them are finding it useful to waterproof off the shelf units for tracking the beginning and end of dives. (Dives in open water often involve currents that can really move you along.) To avoid any wiring, a floating case is used. When the diver wants to grab a waypoint, he/she lets the gps surface for a short while to acquire a fix. Then the diver can pull it back down and mark the waypoint or record the coordinates.

Ablative Power On My Doorstep

March 12, 2008 by 22 Comments


After months of waiting, emailing and waiting some more, I took the afternoon off to stay home and wait for this special delivery. (I had to wait an extra day due to a shipping issue!) I received three huge boxes in my workshop. Not only did I receive this (not so mini) Epilog mini 24, I put together a stand and unpacked a monster air filter.

Read on for the obligatory Hack-A-Day logo and my first impressions of this sweet piece of kit.

Continue reading “Ablative Power On My Doorstep” →

Hackit: Laser Cutters – With A Prize!

March 10, 2008 by 169 Comments


I’m going to have a special guest in my workshop for a while: an Epilog Mini 24 45 watt laser cutter. This is entirely thanks to Epilog Laser down in Golden Colorado. Here’s today’s hackit: If you had access to your own 45 watt laser cutter – with a 12″ x 24″ work surface, what would you make with it?

Oh, and there’s a prize on this one. Whoever comes up with the best idea will get a free laptop engraving session. (You can always just ship me the display cover.) You can have your own art put on, or we can always tattoo your machine with the Hack-A-Day logo.

(Pictured is Ladyada’s laser cutter. Mine’s coming tomorrow!)