A new version of Roland's hugely popular portable combo amp first introduced in 2007 has been announced. The Cube Street II now wears a Boss logo on the grille, comes with twice the output oomph and ...

Ventura, Calif. [July 7, 2010] – After a string of firefighter injuries and deaths related to radio communication in the 2000s, the International Association of Fire Chiefs formed a special ...

We published a design for a stereo microphone preamplifier with balanced inputs and a phantom power supply. The heart of this circuit was a special Analog Devices IC, the SSM2017. Unfortunately, this ...

The circuit is a microphone amplifier for use with low impedance (~200 ohm) microphones. It will work with stabilized voltages between 6-30VDC. If you don’t build the impedance adapter part with T1, ...

Questyle’s Sigma Pro ($899) and Sigma ($599) portable DAC with headphone amplifiers offer Current Mode Amplification, Bluetooth LE, and LDAC. Previewed at CanJam London 2025, the new Questyle Sigma ...

Monoprice’s Monolith Portable Headphone Amplifier and DAC will bring out the best in your headphones, but the unit’s form factor, analog input, and smudge-prone surface hold it back from earning ...