[sdiy] SMT transistor for white noise?

[Mike Bryant]

I think you'll find the LM194 and its clones are the only monolithic ones left now.   There were others a few years ago but most others are now two very well matched but separate die in the same package.
________________________________
From: Synth-diy <synth-diy-bounces at synth-diy.org> on behalf of Ian Fritz via Synth-diy <synth-diy at synth-diy.org>
Sent: 13 December 2025 19:53
To: Gordonjcp <gordonjcp at gjcp.net>
Cc: synth-diy at synth-diy.org <synth-diy at synth-diy.org>
Subject: Re: [sdiy] SMT transistor for white noise?

Do they have these in monolithic pair packages?

Ian

> On Dec 13, 2025, at 12:27 PM, Gordonjcp <gordonjcp at gjcp.net> wrote:
>
> On Sat, Dec 13, 2025 at 11:11:54AM +0000, Mike Bryant wrote:
>> Too true 🙂   A large percentage of the world's small signal transistors now come from a huge fab in Chongqing and they just brand them to whatever their client wants.
>>
>
> Many years ago I bought a bag of something like 500 of the cheapest Chinesiest BC548-wannabes from Some Dude In Shenzen On eBay, expecting to maybe hand-match a couple of sets of a dozen reasonably close ones for filters.
>
> Nope.
>
> Any two you pulled out of the bag at random would have the same Vbe down to *microvolts*.
>
> So that was a quicker evening than I anticipated.
>
> --
> Gordonjcp
>
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