DIY Cap-Touch Amp for Mobile Audio
The capacitive-touch stage of the personal audio amp (Source: C. Denninger & J. Lichtenfeld)

Why buy an amp for your iPod or MP3 player when you can build your own? With the proper parts and a proven plan of action, you can craft a custom personal audio amp to suit your needs. Plus, hitting … Continue reading

Aerial Robot Demonstration Wows at TEDTalk
Robotics2

In a TEDTalk Thursday, engineer Vijay Kumar presented an exciting innovation in the field of unmanned aerial vehicle (UAV) technology. He detailed how a team of UPenn engineers retrofitted compact aerial robots with embedded technologies that enable them to swarm … Continue reading

Voice Coil Parts & Production
A close-up view of both a good voice coil and a burned voice coil (Source: The Speaker Exchange)

Voice coils are essential elements in loudspeakers of all sorts. Thus, understanding how a voice coil works is essential for audio engineers and DIYers alike. The main parts the bobbin, the voice coil wire, and the collar. Mike Klasco and … Continue reading

Robot Nav with Acoustic Delay Triangulation
Square playing field (Source: Larry Foltzer CC260)

Building a robot is a rite of passage for electronics engineers. And thus this magazine has published dozens of robotics-related articles over the years. In the March issue, we present a particularly informative article on the topic of robot navigation … Continue reading

audioXpress: HP456A Current Probe Restoration
The restoration is finished and ready for cover installation (Soure: Bill Reeve AX 2/12)

Retro electronics (or “retronics”) projects are growing in popularity. Across the globe, professional engineers and DIYers alike are tweaking, updating, and hacking retro systems to create all sorts of innovative designs. Restoring and upgrading an old electronics tool, MCU-based design, … Continue reading