White noise from 5V

The usual, analog way to create white noise for synths is via a transistor operated "the wrong way" / reverse biased with the collector left open; but: This requires a voltage of usually 12 volts; the 5V of AE is not sufficient for this technique. Therefore, the AE NOISE module uses a tiny microcontroller (Attiny13) that creates a random pulse sequence at rather high frequency, which results in an almost white noise after a little bit of filtering. Basically the same as electricdruid does with it's noise generator chip.

This is the hint in the reddit post (btw covering the topic quite well): 
"Hrnek_Bezucha BEITRAGSERSTELLER*IN vor 5 Jahren
Pseudo random noise with shift registers? That's it! LFSR pseudo-random generator is the next thing I'm doing. And it'll all go nicely with the rest of the CMOS circuit. Thank you! You just opened so many possibilities.."

Here is a simple LFSR register noise generator I designed to 5V.
You don't have to even use 71 bits, you can use 39 bits for example...more than enough.

rough noise generator for evaluation Model 5.pdf (18.84 KB)
I use this table to find what works with the cd4517 cd4094 combo


datacipy.cz/lfsr_table.pdf

LFSR have a minimum part count and unless you have the rare CD4006 it is tough for low part counts.

There are non-LFSR noise makers I have made, but the noise is very random and sometimes picks up 60 cycles.

I do have one of those 1980s 21bit? 8 pin noise makers I parted from a Siel DK-80.

Now there is low parts count.

I will scare up the circuit later.

But this chip is basically unobtanium. (after all , who uses a Siel)

Electric Druid can sell you something much better!


electricdruid.net/product-category/lfos-noise/