Few people have heard of it, yet many consider John Blankenbaker's KENBAK-1 to be the first commercial personal computer.

Koss introduced these headphones over 40 years ago, and they remain affordable favorites to this day.

Build A Classic Crystal Radio

Crystal radio

When I was a kid, Radio Shack offered an affordable crystal radio kit [Update: They now offer a fancy FM Radio Kit]. The crystal set magically produced scratchy AM radio without the need for pesky batteries, transistors, or amplifiers. Instructables offers a step-by-step guide to building your own little crystal set, so you can amaze your iPod toting friends with dozens of channels of Talk Radio. Because the sound is generated solely by to energy of the filtered radio wave, the radio works best in urban areas with strong reception.

"I have, for some unknown reason, always been interested in ancient technology, mainly electronics and mechanical things and I have always wanted to make a true old fashioned style crystal radio. A crystal radio, or crystal set as it is sometimes called, is a radio that only uses the power of the radio waves picked up by the antenna to generate the sound heard in the head phones. The reason it is called a crystal set is because they use a mineral crystal as a diode for the detector in the circuit."

My guess is that I'd spend far more time building the case than wiring together the simple circuit. Steampunk radio, here I come!

Build an antique style crystal radio [Instructables]

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