But since every transistor has a different breakdown voltage and every transistor will render different noise quality, selection of this component will require some research on your part. The basic schematic looks like this:Īlthough not pointed in the above schematic, I ended up using the good old BC107B transistor. For the build I tried a whole bunch of transistors – nothing significant, simply what I had in the junk box. Like so many old designs, this one also depends on noise inherent in an NPN transistor between its emitter and base. Okay, I like to experiment! First off, this is a pretty minor revision. For example, white noise is used there typically to recreate percussive instruments such as cymbals and snare drums which have high noise content in their frequency domain ( ). White noise is also used extensively in the audio electronics domain for making electronic music. Personally, I’m using a homemade white noise machine as a sleep aid to drown out annoying noises in and around my bedroom at night ( ). Since white noise includes all audible frequencies, it’s often used to mask other sounds. White noise is so named because it’s analogous to white light which is a blend of all visible wavelengths of light. In principle, white noise is random noise that has a flat spectral density, that is to say, the white noise has the same amplitude, or intensity, throughout the 20Hz to 20kHz audible frequency range. Nevertheless, I’ll be doing some more work with this concept, so keep an eye out for a future post on the subject. In this article, you can see a few basic design ideas as a result of those experiments. Now I’m building some white noise and pink noise generators for an upcoming amateur audio project.
Welcome to the lovely sound of analog electronics!
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