Circuits for all noise generator

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Discussion Overview

The discussion revolves around designing a noise generator circuit capable of producing various colors of sound, including white noise. Participants are seeking circuit diagrams, particularly for filters that can switch between different noise colors, and are exploring both theoretical and practical aspects of the design.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related
  • Debate/contested

Main Points Raised

  • One participant is looking for a circuit diagram for a noise generator that can produce all colors of sound.
  • Another mentions that white noise can be filtered into other colors and provides a link for further reading.
  • Several participants express the need for circuit diagrams specifically for filters and switching mechanisms.
  • A suggestion is made to use op-amps for building filters and to switch between outputs or use a mixer for fading between colors.
  • One participant notes the importance of pink noise for audio applications due to its perceived flat response in human hearing.
  • A participant shares a diagram involving three op-amps and discusses the need for a suitable output for speakers and a power supply for the op-amps.
  • Another participant shares a personal experience with using an oscillating fan as a source of white noise for sleep, indicating a practical application of noise generation.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and capability regarding the complexity of the project. There is no consensus on the best approach or design, and multiple viewpoints on the feasibility and methods remain present.

Contextual Notes

Some participants indicate uncertainty about the complexity of the task and the adequacy of their knowledge, suggesting that assumptions about the required skills and resources may vary.

Who May Find This Useful

This discussion may be useful for students or hobbyists interested in audio electronics, particularly those looking to design noise generators or explore sound filtering techniques.

fpop
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i am trying to find a circuit diagram for a noise generator that can change between all the colours of sound. it is driving me made and was wondering if anybody can help please
 
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There was a thread about white noise a little bit ago.

Long story short, you can filter white noise into the other colors.

http://rane.com/par-n.html#noise_color
 
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i need to get a circuit diagram for the filters and how to switch between them
 
fpop said:
i need to get a circuit diagram for the filters and how to switch between them
I googled gyrator audio filter and got lots of hits. Here's a pretty good one to start you off:

http://www.rane.com/note122.html
 
fpop - if you know how to use an opamp then its somewhat simple, you can search for lots of circuit diagrams for filters. You simply switch between the outputs or could build a simple mixer to fade between them.

What is this for?

If you're demonstrating something, a computer with software like Cool Edit (now Adobe Audition or something) will let you generate and filter the signal to your heart's content in seconds and will be very easy to use in comparison.

If you're doing something with audio gear, pink noise is the standard color because of its similarity to human hearing that roughly deems equal power per octave to be a 'flat' response. Look up Fletcher-Munson for a lot more detail on how the amplitude level affects this relationship.
 
i need it for school i have to design and build a white noise generator that can switch between the colours using filters but i think I am out of my depth
 
Sounds a little advanced. I found this diagram and it uses a three op-amps (ignore the bottom half of the pic).
http://www.synthfool.com/schematics/polynoise.gif

You could just use a regular SPDT switch to go between the two colors but would need an output suitable for driving a speaker (if you don't have a power amp) and you also need a power supply for the opamps.

I would think there would be an easier way to accomplish the task.
 
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I too need http://www.speechprivacysystems.com/white-noise" to sleep and i always use an oscillating fan for years now as the noise of it puts me to sleep easily and also blocks out any background noise at nite i.e. car alarms, train whistle, dog barking etc.
 
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