Noise generators ( 10 ) :

Noise generators are generally used in various measurements. The mostcommon way to generate noise signals are to use a randon-bit-sequence generator or to amplify the thermal noise of some electronic component(usually diode or transistor). The most commonly needed noise sourcesin audio measurements are "white noise" and "pink noise". White noiseis pure random noise, and the pink noise is specifically filtered whitenoise. In some digital telecommunication testing applications streams of random or semi-random bitstreans are needed. Those random orsemi-random bitstreams are generated using a random-bit-sequence generator.

• Audio Frequency Digital Noide 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. The circuit is in pdf format.   
• Circuit forms random-bit-sequence generator - A random-bit-sequence generator is basic equipment for prototyping and testing any data-transmission system. You use such a generator when measuring BER (bit-error rate) and pattern-dependent effects in a transmission system.    Rate this link
• Digital Generation of LFO's for Modulating Effects - pseudo-random signal generating circuit ideas    Rate this link
• Make noise with a PIC - Building a stable noise generator for audio-frequency purposes requires only a few components. This circuit relies on linear-feedback shift registers and some simple software.   
• Noise Generator - Sometimes there is a need for a noise generator: this will work well in the audio range and, without the 680pF capacitor, will extend in the radio frequency range up to 20-30MHz.   
• Pink Noise Generator (Flicker Noise) - This is an implementation of a flicker noise generator described in NBS technical note #604, "Efficient Numerical and Analog Modeling of Flicker Noise Processes" by J.A. Barnes and Stephen Jarvis, Jr. Unlike circuits employing zeners, reverse-biased transistors, and other noisy devices, this circuit gives a predictable and repeatable output level.   
• Pseudonoise generator doubles its speed - you can double the speed of a standard pseudonoise (PN) generator by using additional exclusive-OR gates and a fast 2:1 multiplexer   
• Random Noise Sources - Producing crypto-quality randomness in a computer is a perennial issue in cryptography, here are some ideas   
• Single IC forms pseudorandom-noise source - Trying to find a single IC noise source can be frustrating. You could use a single-chip microcontroller, such as Microchip's 12C508 for this application. This article gives you idea and software how to do that.   
• White and Pink (1/F) Noise Source   

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