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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.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Ian Fritz via Synth-diy <synth-diy@synth-diy.org><br>
<b>Sent:</b> 13 December 2025 19:53<br>
<b>To:</b> Gordonjcp <gordonjcp@gjcp.net><br>
<b>Cc:</b> synth-diy@synth-diy.org <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] SMT transistor for white noise?</font>
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<div class="PlainText">Do they have these in monolithic pair packages?<br>
<br>
Ian<br>
<br>
> On Dec 13, 2025, at 12:27 PM, Gordonjcp <gordonjcp@gjcp.net> wrote:<br>
> <br>
> On Sat, Dec 13, 2025 at 11:11:54AM +0000, Mike Bryant wrote:<br>
>> 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.<br>
>> <br>
> <br>
> 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.<br>
> <br>
> Nope.<br>
> <br>
> Any two you pulled out of the bag at random would have the same Vbe down to *microvolts*.<br>
> <br>
> So that was a quicker evening than I anticipated.<br>
> <br>
> --<br>
> Gordonjcp<br>
> <br>
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