Electronic – How to build a noise generator based entirely on logic gates

digital-logicgeneratornoisettl

I would like to build a noise generator based on logic gates. It could be white noise generator or a random bits generator that sound similar to a noise source. I need a circuit recommendation or an idea how to make it.

Updated: The purpose is to make an electronic music device. Any kind of noise can be interesting for me.

Best Answer

How about one of these: -

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Taken from here.

It is described as a white noise source: -

24 Stage Linear Feedback Shift Register (LFSR)

This circuit can be used to generate a pseudo-random sequence of 0's and 1's -- that is "white noise" or "static." The schematic shows a 24 stage shift register with XNOR taps at registers 7, 16, 22, and 24 using the Fibonacci configuration. With these taps, the circuit generates a "maximal length sequence" of pseudo random values which repeats only after (2\$^{24}\$ - 1) clock pulses.

Or maybe just use an analogue one based on the emitter-base breakdown voltage of transistor Q1: -

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