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12AU7HeadphoneAmp_1.jpg
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Gio, a MAKE subscriber from Winnipeg, Canada, sent us a link to this well-documented low voltage headphone amp project. The tube-based amp uses a single 12AU7 tube for voltage gain and a IRF510 MOSFET to supply current to drive the ‘phones. The small hybrid amplifier operates off a 12V SLA (sealed lead-acid) battery, so there are no high voltage concerns. An LM317 regulator was used as a constant current source to bias the MOSFET into class-A operation. The amp can be built for about $40-50, less if recycled parts are used.

(Psyched to see the builder using the Grado SR60 headphones, my all-around, all-time faves.)

NP-100v12: 12AU7 (ECC82) / IRF510 Headphone Amp

Gareth Branwyn

Gareth Branwyn is a freelancer writer and the former Editorial Director of Maker Media. He is the author or editor of a dozen books on technology, DIY, and geek culture, including the first book about the web (Mosaic Quick Tour) and the Absolute Beginner’s Guide to Building Robots. He is currently working on a best-of collection of his writing, called Borg Like Me.


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