[sdiy] SMT transistor for white noise?

[Jay Schwichtenberg]

Looking at the EDN schematic again I think there is an error. Think C1 
should go from Q1's emitter and ground, not emitter and +12. I built 
mine with C1 going to ground.

Jay S.

On 12/13/2025 1:05 PM, Mike Beauchamp wrote:
> On 2025-12-13 09:35, Brother Theo via Synth-diy wrote:
>> I switched to the 2 transistor noise circuit and have had zero issues 
>> since. The Future Retro 777 re-release uses that circuit.
>
> Hi Timothy, doing some duckduckgo-ing, I found a few...
>
> https://www.edn.com/simple-white-noise-generator/
>
> https://www.nutsvolts.com/magazine/article/bipolar_transistor_cookbook_part_5 
> (figure 20)
>
>
> The EDN article is interesting. Seems like the second transistor is 
> just the amplification stage and the increased noise level is because 
> of the addition of C1. I don't understand the function of C1.. time to 
> get out the breadboard.
>
> Mike
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