Uploaded June 2021 | Updated September 2026, 2 weeks ago
PCBWay Supports High Precision Advanced PCBs: pcbway.com
White noise and pink noise generators are useful for audio synthesis projects. This PCB uses a 31 bit linear feedback shift register (LFSR) implemented in an ATTiny85 to create pseudo random white noise. The noise is buffered with an op amp before going to a header.
The white noise is also low pass filtered at -3 dB/octave using resistors/capacitors to create pink noise, which is also op amp buffered and made available on a header.
0:00 Intro/background
0:54 Schematic design
3:09 Digital pseudo noise generation method
4:54 FFT of noise on the scope
5:22 Noise spectrum and sound samples in Audacity
Sketch github.com/GadgetReboot/White_Noise_LFSR
Schematic github.com/GadgetReboot/White_Pink_Noise
Bare PCBs at PCBWay.com pcbway.com/project/shareproject/White_Noise_Pink_Noise_Generator.html
Referenced videos for more info about this design:
LFSR more info youtube.com/watch?v=Antpjin7Hp4
Choosing op amp resistor values youtu.be/B_XrTqrQqT0
Pink noise -3 dB/octave filter design/test youtu.be/WkxOJcZEWtU
Useful links:
Transistor white noise freenrg.info/Physics/Scalar_Vector_Pot_And_Rick_Andersen/Rick_Andersen_Noisegen.htm
LFSR info en.wikipedia.org/wiki/Linear-feedback_shift_register#Fibonacci_LFSRs
LFSR tap points jmargolin.com/patents/atari3.pdf
Desmos scientific calculator desmos.com/scientific
If you'd like to support the channel, you can:
Support me on Patreon: patreon.com/gadgetreboot
Shop through my affiliate links!
Banggood banggood.com/custlink/3vKYLANH8N
Aliexpress https://s.click.aliexpress.com/e/_AFeHwB
Amazon.com amazon.com/?&_encoding=UTF8&tag=gadgetreboo05-20&linkCode=ur2&linkId=952875a3564e2204d1786f94b9e1a8d3&camp=1789&creative=9325
Amazon.ca amazon.ca/?&_encoding=UTF8&tag=gadgetreboot-20&linkCode=ur2&linkId=70fa82315ac48f03342938bd4fb93535&camp=15121&creative=330641
Videos are mirrored at LBRY/Odysee: odysee.com/@GadgetReboot:4
#ElectronicsCreators
PCBWay Supports High Precision Advanced PCBs: pcbway.com
White noise and pink noise generators are useful for audio synthesis projects. This PCB uses a 31 bit linear feedback shift register (LFSR) implemented in an ATTiny85 to create pseudo random white noise. The noise is buffered with an op amp before going to a header.
The white noise is also low pass filtered at -3 dB/octave using resistors/capacitors to create pink noise, which is also op amp buffered and made available on a header.
0:00 Intro/background
0:54 Schematic design
3:09 Digital pseudo noise generation method
4:54 FFT of noise on the scope
5:22 Noise spectrum and sound samples in Audacity
Sketch github.com/GadgetReboot/White_Noise_LFSR
Schematic github.com/GadgetReboot/White_Pink_Noise
Bare PCBs at PCBWay.com pcbway.com/project/shareproject/White_Noise_Pink_Noise_Generator.html
Referenced videos for more info about this design:
LFSR more info youtube.com/watch?v=Antpjin7Hp4
Choosing op amp resistor values youtu.be/B_XrTqrQqT0
Pink noise -3 dB/octave filter design/test youtu.be/WkxOJcZEWtU
Useful links:
Transistor white noise freenrg.info/Physics/Scalar_Vector_Pot_And_Rick_Andersen/Rick_Andersen_Noisegen.htm
LFSR info en.wikipedia.org/wiki/Linear-feedback_shift_register#Fibonacci_LFSRs
LFSR tap points jmargolin.com/patents/atari3.pdf
Desmos scientific calculator desmos.com/scientific
If you'd like to support the channel, you can:
Support me on Patreon: patreon.com/gadgetreboot
Shop through my affiliate links!
Banggood banggood.com/custlink/3vKYLANH8N
Aliexpress https://s.click.aliexpress.com/e/_AFeHwB
Amazon.com amazon.com/?&_encoding=UTF8&tag=gadgetreboo05-20&linkCode=ur2&linkId=952875a3564e2204d1786f94b9e1a8d3&camp=1789&creative=9325
Amazon.ca amazon.ca/?&_encoding=UTF8&tag=gadgetreboot-20&linkCode=ur2&linkId=70fa82315ac48f03342938bd4fb93535&camp=15121&creative=330641
Videos are mirrored at LBRY/Odysee: odysee.com/@GadgetReboot:4
#ElectronicsCreators
