Difference between revisions of "Noise Generator on ER-PROTO-01"

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* White Noise Generator
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[[File:tindie-mediums.png|link=https://www.tindie.com/products/28599/]]
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[[file:ER-PROTO-01_NOISE_P1090103-FR-B-720px.jpg]]
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== Features ==
 +
 
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* Eurorack 6HP, 3U module
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* Noise Generator
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** Based on Moritz Klein's [https://www.youtube.com/watch?v=0yB_h_wFkh4 Designing a white, pink & blue noise generator from scratch] design
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** [https://en.wikipedia.org/wiki/Colors_of_noise White, Pink, Blue noise outputs]
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** Outputs are all buffered
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* Built on [[ER-PROTO-01]] card
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* 10 pin Eurorack power connector
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=== Noise Generator ===
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* Credit Moritz Klein's Designing a white, pink & blue noise generator from scratch design
 +
 
 +
<video type="youtube">0yB_h_wFkh4</video>
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* Noise Generator
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 +
[[file:moritz_noise.PNG]]
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* White/Pink/Blue noise
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 +
[[file:moritz_WHITE_PINK_BLUE.PNG]]
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* High Pass Filter (Blue Noise)
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 +
[[file:moritz_HPF.PNG]]
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* Low Pass Filter (Pink Noise)
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 +
[[file:moritz_LPF.PNG]]
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== Build ==
 +
 
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=== White Noise Generator ===
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* Voltage Gain = 148
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* Switched from TL074 to TL084
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 +
[[file:ER-PROTO-01_NOISE_WHITE_Before.PNG]]
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 +
* Output seems pretty quiet (~200 mV)
 +
** Issue is 2N3904 is much quieter than a [https://www.mouser.com/ProductDetail/637-BC548B BC548]
 +
** Switched to [https://www.mouser.com/ProductDetail/637-BC548B BC548]
 +
* Offset errors = about 500 mV
 +
** Gain = 148, 500mV = 3.5mV offset voltage
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** Add offset voltage trimmer
 +
** [https://electronics.stackexchange.com/questions/34071/how-do-i-correct-the-offset-voltage-of-op-amps-which-have-no-explicit-offset-nul Circuit from here]
 +
 
 +
[[file:OpAmp_Offset_Adj.PNG]]
 +
 
 +
* Schematic with offset
  
 
[[file:ER-PROTO-01_NOISE_WHITE.PNG]]
 
[[file:ER-PROTO-01_NOISE_WHITE.PNG]]
  
−
* Blue/Pink Noise
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==== White Noise Scopecaps ====
 +
 
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* White Noise Scope capture
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* 2 mS / div
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 +
[[file:White_Noise_Scope_Cap-01.png]]
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* FFT, 25HKz range
 +
 
 +
[[file:FFT_White_Noise_25KHz.PNG]]
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 +
=== Blue Noise Generator ===
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 +
[[file:ER-PROTO-01_NOISE_BLUE.PNG]]
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==== Blue Noise Screencaps ====
 +
 
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* FFT 1mS scope setting
 +
 
 +
[[file:FFT_Blue_J4_Noise_1mS.PNG]]
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 +
=== Pink Noise Generator ===
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 +
[[file:ER-PROTO-01_NOISE_PINK.PNG]]
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 +
=== Pink Noise Scopecaps ===
 +
 
 +
[[file:Pink_Noise_Scope_Cap.png]]
 +
 
 +
[[file:FFT_Pink_J4_Noise_1mS.PNG]]
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 +
=== Pink Noise LTSpice ===
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 +
[[file:ER-PROTO-01_NOISE_Pink_LTSpice.PNG]]
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=== Jacks ===
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 +
[[file:ER-PROTO-01_NOISE_J38.PNG]]
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== Connectors ==
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=== J1 - White Output ===
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 +
* +/- 7.5V swing
 +
 
 +
=== J3 - Pink Output ===
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 +
=== J4 - Blue Output ===
 +
 
 +
=== Eurorack Power ===
 +
 
 +
[[file:ER-PROTO-01_U1_PWR.PNG]]
 +
 
 +
== Build Details ==
 +
 
 +
* Three card set
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** [[ER-PROTO-01]] Front Panel card
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** [[ER-PROTO-01]] Controls card
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** [[ER-PROTO-01]] Daughtercard
 +
 
 +
[[file:ER-PROTO-01_NOISE_P1090115-720px.jpg]]
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 +
=== On Controls Card ===
 +
 
 +
[[file:ER-PROTO-01_NOISE_P1080760-JacksRework-720px.jpg]]
 +
 
 +
* Install J1, J3, J4
 +
* Wire J1-S to J3-S
 +
* Wire J3-S to J4-S
 +
 
 +
=== On Daughtercard ===
 +
 
 +
[[file:ER-PROTO-01_NOISE_P1090110-720px.jpg]]
 +
 
 +
* Transistor Noise Source wiring
 +
 
 +
[[file:ER-PROTO-01_NOISE_P1090111-720px.jpg]]
 +
 
 +
* Opamp wiring
 +
 
 +
[[file:ER-PROTO-01_NOISE_P1090112-ANNOTATED-720PX.jpg]]
 +
 
 +
== References ==
  
−
[[file:ER-PROTO-01_NOISE_PINK_BLUE.PNG]]
+
[https://www.schmitzbits.de/noise.html schmitzbits White Noise Source]

Latest revision as of 18:51, 11 March 2023

Tindie-mediums.png

ER-PROTO-01 NOISE P1090103-FR-B-720px.jpg

Features

Noise Generator

  • Credit Moritz Klein's Designing a white, pink & blue noise generator from scratch design

  • Noise Generator

Moritz noise.PNG

  • White/Pink/Blue noise

Moritz WHITE PINK BLUE.PNG

  • High Pass Filter (Blue Noise)

Moritz HPF.PNG

  • Low Pass Filter (Pink Noise)

Moritz LPF.PNG

Build

White Noise Generator

  • Voltage Gain = 148
  • Switched from TL074 to TL084

ER-PROTO-01 NOISE WHITE Before.PNG

  • Output seems pretty quiet (~200 mV)
    • Issue is 2N3904 is much quieter than a BC548
    • Switched to BC548
  • Offset errors = about 500 mV
    • Gain = 148, 500mV = 3.5mV offset voltage
    • Add offset voltage trimmer
    • Circuit from here

OpAmp Offset Adj.PNG

  • Schematic with offset

ER-PROTO-01 NOISE WHITE.PNG

White Noise Scopecaps

  • White Noise Scope capture
  • 2 mS / div

White Noise Scope Cap-01.png

  • FFT, 25HKz range

FFT White Noise 25KHz.PNG

Blue Noise Generator

ER-PROTO-01 NOISE BLUE.PNG

Blue Noise Screencaps

  • FFT 1mS scope setting

FFT Blue J4 Noise 1mS.PNG

Pink Noise Generator

ER-PROTO-01 NOISE PINK.PNG

Pink Noise Scopecaps

Pink Noise Scope Cap.png

FFT Pink J4 Noise 1mS.PNG

Pink Noise LTSpice

ER-PROTO-01 NOISE Pink LTSpice.PNG

Jacks

ER-PROTO-01 NOISE J38.PNG

Connectors

J1 - White Output

  • +/- 7.5V swing

J3 - Pink Output

J4 - Blue Output

Eurorack Power

ER-PROTO-01 U1 PWR.PNG

Build Details

ER-PROTO-01 NOISE P1090115-720px.jpg

On Controls Card

ER-PROTO-01 NOISE P1080760-JacksRework-720px.jpg

  • Install J1, J3, J4
  • Wire J1-S to J3-S
  • Wire J3-S to J4-S

On Daughtercard

ER-PROTO-01 NOISE P1090110-720px.jpg

  • Transistor Noise Source wiring

ER-PROTO-01 NOISE P1090111-720px.jpg

  • Opamp wiring

ER-PROTO-01 NOISE P1090112-ANNOTATED-720PX.jpg

References

schmitzbits White Noise Source

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