[sdiy] SMT transistor for white noise?

[Gordonjcp]

On Sat, Dec 13, 2025 at 12:55:30AM -0500, Mike Beauchamp wrote:
> I'm noticing my latest batch of MMBT3904 by ONSEMI are barely creating any
> white noise, requiring about 8000x gain to get up to +/- 5V.
> 
> Previous batches of the MMBT3904 only required about 500x gain to get up to
> +/- 5V. When I was using TH 2N3904, I think the gain required was only about
> 200x.

I'm guessing you've got cheap Chinese ones this time round. They're far too high quality to use as noise sources.

You need to pay a bit extra to get American-made dodgy counterfeit components for this.

-- 
Gordonjcp