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Circuit trade-offs minimize noise in battery-input power supplies

RF-communicating computers and other new mobile systems can act as portable generators of unwanted noise and EMI, thereby hampering their own market acceptance.

http://www.edn.com/archives/1996/011896/02df3.htm

A filter for a noise generator

Some computations involving analog computers require a random noise source - think, for example, of a system consisting of several masses which are coupled to each other using springs and dampers (like a car suspension system). Such a system may be excited by a random noise source, thus simulating a bumby road.

http://www.vaxman.de/projects/noise_filter/noise_filter.html

Building a Low-Cost White-Noise Generator

White noise, which is defined as noise with constant power spectrum, is useful for measuring and testing wide-band communication circuits. Commercially available white noise generators are usually very expensive. The design idea presented in this article is an inexpensive method that produces white noise up to several hundred MHz.

http://www.maxim-ic.com/appnotes.cfm/an_pk/3469

Pink Noise Generator for Audio Testing

For audio testing, a pink noise source is an invaluable tool. It is essentially a flat frequency response noise source, and will quickly show any anomolies in speaker systems, room acoustics and crossover networks.

http://sound.westhost.com/project11.htm

Tiny White Noise Generator

By using the programmable blocks of a Cypress MicroSystems CY8C25122 PSoC microprocessor, it is possible to construct a 100Khz bandwidth white noise generator that provides a unique output sequence for six hours before repeating.

http://web-ee.com/schematics/noise_generation/pseudo-random-white-noise/

Digital White Noise Source

Digital noise is a series of (more or less) random low/high pulses. Analog noise is an analog signal without any (apparent) order. There exist several types of noise, the most important ones being "white" noise, "pink" noise and "brown" noise.

http://www.triplespark.net/elec/oscillator/DWNoise0/

Audio Frequency Digital Noise Generator

When you need to test an audio circuit with broadband noise, this circuit works great. It uses just three inexpensive C-MOS ICs that generate a series of output pulses whose widths vary randomly. This circuit includes a level control pot.

http://www.imagineeringezine.com/PDF-FILES/noisegen.pdf