AMB Laboratories Mini³ Headphone Class-T Amplifier
News
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Mini³ circuit boards ar•
Pre-drilled and engraved Mini³ front and rear panels are now available on a made-to-order
basis from•
Custom-built, ready-to-use Mini³ amplifiers are available from som•
Mini³ ("Mini cubed") is a high-quality DIY portable stereo amplifier for dynamic headphones. Designed
to be a small battery-powered unit with built-in charging circuit, Mini³ provides high performance and
excellent sound that belies its size and cost. Its footprint is almost exactly the size of a credit card,
and about 0.9" (23mm) thick.
A perfect companion with portable media players such as the Apple® iPod®, Mini³ offers dramatically
improved sound when driven from the player's line output, and used with high quality headphones.
The performance of Mini³ is so good, it could also serve as a headphone amplifier with dedicated
home CD players and other sources without taking up much desk or shelf space. In conjunction with
an off-the-shelf enclosure solution and wire-free board mounting of all components, Mini³ is easy and
inexpensive to build. The only surface-mount parts are the two opamps, all other parts are through-
hole. See tThe scope of the Mini³ project
The Mini³ project is primarily centered around the main headphone amplifier board, which
incorporates a battery-charging circuit. To make a working amplifier, you will also need a 9V NiMH
rechargeable battery, an AC-to-DC adapter "wallwart" (for battery charging), and a Hammond
