There are a small handful of old tubes that need an impressively low voltage to work, though, and [J.G.] has put a few of them to work in this battery-powered audio tube amplifier. The key to the ...

Amazon has knocked a big 50% off this NEXPOW car battery jump starter in a major deal that also includes an extra discount on ...

Major audio amplifier market participants include Analog Devices, Cirrus Logic, Infineon Technologies, NXP Semiconductors, On ...

FiiO has announced the BTR17, a new portable headphone amplifier built ... the device to drive power-hungry headphones without draining the connected phone’s battery. The small FiiO BTR17 ...