it keeps a bit of the dead battery out of the landfill, and this method provides a built-in connector for a 9v power source. In this case the circuit is built around a LM386 audio amplifier.

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 ...

Additionally, battery-operated power stations can be ran indoors ... To calculate watts, multiply voltage (usually 120 volts) by the amps (amperage) required to run the appliance (usually found ...

Boss’s Katana series amps have become favorites with guitarists looking for lightweight, durable and affordable amplifiers that offer the sound, feel and response of classic tube amps while ...

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 ...