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.

The DIY Audio Projects Blog

Almost a tube amp.

Gio Militano's blog is a great place to find out about the latest happenings in the DIY audio community. Last month, he mentioned that the much-loved K-12 Tube Amplifier Kit by S-5 Electronics is back in stock at Tube Depot. The companion DIY Audio Projects site lists dozens of fantastic kits, including chip amps, home made speakers and even DIY audio cables.

The CMoy Mint Tin Headphone Amp looks particularly appealing as an inexpensive way to drive my 1980s-vintage AKG K260 headphones from an mp3 player. Gio reports, "My version uses two nine volt batteries and the OPA2132PA (Burr-Brown) operational amplifier. The CMoy headphone amplifier sounds pretty darn good when you consider the simplicity and low cost. It provides excellent clarity, even at high volume. The headphone amplifier does not seem to add its own colorations to the sound and there is a lot of detail."

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