Elektor published a matchbox radio project that pushed the limits of miniaturization. It was a compact, fully functional AM radio.

Introduction Many commercially available headphone amplifiers utilize design topologies such as Class AB, Class D and Class G and are found in the output stage of ICs such as DACs and codecs. Key ...

This forms the basis of [Ratti3]’s amplifier, but with the added interest of a battery supply and a Bluetooth connection. The tube circuit is a very conventional anode follower using an EF95 ...

With signature FiiO power, innovative engineering and sleek aesthetic sensibility, the K15 is a full-system desktop DAC/amp ...

Austrian Audio’s Full Score One is a terrific headphone amplifier that takes an unvarnished approach to music replay ...

Headphone Amps TEAC’s HA-507 Headphone Amp and Preamp Eschews Digital Circuitry For All-Analog Experience At $1,999, the Technics HA-507 is a pure analog headphone amplifier and preamplifier with a ...

A powerful, affordable desktop solution offering balanced audio, Wi-Fi, and Bluetooth, all for $549. Compare with top ...

555-based class-D headphone driver makes great practice amp This class-D audio amp “plays” to the 555’s strengths. Boost and modify square waves Build your own signal-conditioning modules to provide ...

A typical headphone amp amplifies the left and right audio channels at once from the same IC (integrated circuit). G6 has a bi-amp that individually amplifies the left and right channels individually.

To allow the comparison of different op-amps in a headphone amplifier, [Stephan Martin] has created a stereo amplifier board complete with sockets to take single or dual op-amp chips.

The MAX9724 is a 60-mW DirectDrive stereo headphone amplifier with high RF noise rejection. This device delivers audiophile audio quality with 0.02% ...