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.

Of the commonly recorded physiological potentials, the electroencephalogram (EEG) presents the most difficulties because of the low voltage (10–1,000 µV.) and low frequency (1–50 c./s.) of ...

AWT Global has launched a new product line of low noise amplifiers: the LNA1 Series. The new compact Low Noise Amplifiers (LNAs) are suited as RF measurement amplifiers and for signal boosting ...

The 1/f (one-over-f) low frequency noise region of amplifiers seems just a bit mysterious. Reader “tweet” asked for a discussion of 1/f noise—a challenging topic for a short blog. It’s also called ...

This is a very nice ‘hack’, especially with multi-op-amp packages. Noise is reduced by the square root of the number of amplifiers. The 8 amplifier circuit cuts noise by a factor of 1/2.8 or ...

Home Theaters and dedicated listening rooms often exhibit poor low frequency response with significant emphasis at modal resonances. This is especially true when they are sonically well isolated, due ...

This very-low-frequency sine- and square-wave generator requires few components, ... The output of op amp U1 is applied to the first section of the phase-shifting network via R1 and C1.

High Gain and Low Distortion Characteristics over a wide bandwidth: Traditional circuits for Low Noise Amplifiers require a frequency range from 950 to 2150 MHz for broadcasting satellite bandwidth ...