The Art of Noise

RE: The Art of Noise

cstanton — Mon, 14 Jun 2021 14:42:02 GMT

I love seeing electronics explored just to see what happens with them [View:/resized-image/__size/16x16/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-69f29e5d-8c88-4b3d-a26b-a8a2dbee9e92/contentimage_5F00_2516.png:16:16]

RE: The Art of Noise

navadeepganeshu — Sat, 05 Jun 2021 08:13:55 GMT

Very nice art of noise!

[View:/resized-image/__size/1366x695/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-69f29e5d-8c88-4b3d-a26b-a8a2dbee9e92/contentimage_5F00_207970.jpg:1366:695]

I tried it with BC547 and 4.7K,47K and boom, there is the noise generated. It starts coming after exact 12V and I like the way it works. At the output, starts at 0V, slowly rises, and when input is 12V, noise starts generating and the voltage level settles down. When turned off, the capacitor takes it full negative and slowly comes up to 0 at full discharge. Btw, this is the first circuit I am trying with the new RedPitaya scope!

[View:https://www.youtube.com/watch?v=qRXRiXFY2to:740:466]

RE: The Art of Noise

Jan Cumps — Thu, 27 May 2021 20:40:52 GMT

I have the same transistors, but used BC547B.

12V,

10 K and 100 K

[View:/resized-image/__size/437x900/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-69f29e5d-8c88-4b3d-a26b-a8a2dbee9e92/contentimage_5F00_207969.png:437:900]

RE: The Art of Noise

shabaz — Mon, 24 May 2021 11:11:15 GMT

as though it were sketched with a pencil or crayon

It really does look like that! : ) Maybe that's a new use-case for such a random-signal generator : ) create innovative unique digital brushes for artists : )

RE: The Art of Noise

shabaz — Sun, 23 May 2021 21:25:25 GMT

Hi Jon,

Very interesting blog post, I had not known noise could be generated at these levels with such a simple circuit!

I wish I could remember now how it was implemented (it too was analog) but in an early job I recall that white noise was deliberately inserted in certain receiver audio paths instead of silence, when there was no received signal, to reassure the user that the system was functioning.

Regarding the Art of Electronics book, I tried copying one of the circuits there, which was for pseudo-random noise, it lends itself well to programmable logic so I used a CPLD for it, here: Pseudo-Random Noise; Using it and How to Create it

I recently bought some flickering LEDs from AliExpress (they are supposed to simulate candlelight) I wonder what algorithm or noise method they are using! I might try to connect a photodiode and capture the output (or the current consumption) someday out of curiosity.

RE: The Art of Noise

michaelwylie — Sun, 23 May 2021 19:44:17 GMT

Interesting. Can you show us a spectrum of the noise generated? Maybe 30 seconds worth?

RE: The Art of Noise

fmilburn — Sat, 22 May 2021 23:26:22 GMT

By coincidence I became interested in these circuits recently, mostly with the idea of making a random number generator. Horowitz and Hill have one in the Art of Electronics but I also found a good article on the internet: Really, Really Random Number Generator | Make: (makezine.com). They present an algorithm by John von Neumann and a circuit that can be added to remove weighting away from the center for a binary RNG.