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<p>I acquired a bunch of THAT 320 and 300 and used them for quite a
few ircuits. Sometimes it was likely overkill, like when i built a
ladder filter with them. I found them to be easy to work with and
quite stable. They do cost but i think i either got a deal or
bought a quantity. It was a decade ago. I did score about 20 LM394
cans but it was just as i packed up my lab to storage, I'm
interested in what's what now. I have made a tester and matched
them myself, as already menioned quite easy these days. I started
matching resistors, too, which was quite easy. I also built plenty
of modules with just transistors from a new lot that sounded just
fine.<br>
</p>
<div class="moz-cite-prefix">On 9/9/2023 6:21 PM, Paul Glass-Steel
via Synth-diy wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAFtw5sgXRxmC4_3kK+fg5cOdxy-c6LeYeyrt8mi5v59tQaMeoQ@mail.gmail.com">
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<div dir="auto">I’ve had good results with those too. </div>
<div><br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat, Sep 9, 2023 at 4:20
AM Mike Bryant <<a
href="mailto:mbryant@futurehorizons.com"
moz-do-not-send="true" class="moz-txt-link-freetext">mbryant@futurehorizons.com</a>>
wrote:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)">
<div dir="ltr">
<div
style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">Nxperia
also do dual transistors without the base resistors e.g.
BC856S. They are on the same die so will be well
matched.<br>
</div>
<div
style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)"><br>
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<hr style="display:inline-block;width:98%">
<div id="m_3205686289458010314divRplyFwdMsg" dir="ltr"><font
style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(0,0,0)"
face="Calibri, sans-serif"><b
style="font-family:Calibri,sans-serif">From:</b>
Synth-diy <<a
href="mailto:synth-diy-bounces@synth-diy.org"
target="_blank"
style="font-family:Calibri,sans-serif"
moz-do-not-send="true" class="moz-txt-link-freetext">synth-diy-bounces@synth-diy.org</a>>
on behalf of Scott Bernardi via Synth-diy <<a
href="mailto:synth-diy@synth-diy.org"
target="_blank"
style="font-family:Calibri,sans-serif"
moz-do-not-send="true" class="moz-txt-link-freetext">synth-diy@synth-diy.org</a>><br>
<b style="font-family:Calibri,sans-serif">Sent:</b> 09
September 2023 00:33<br>
<b style="font-family:Calibri,sans-serif">To:</b> SDIY
List <<a href="mailto:synth-diy@synth-diy.org"
target="_blank"
style="font-family:Calibri,sans-serif"
moz-do-not-send="true" class="moz-txt-link-freetext">synth-diy@synth-diy.org</a>><br>
<b style="font-family:Calibri,sans-serif">Subject:</b>
[sdiy] What do people use for matched transistors
these days?</font>
<div> </div>
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<div dir="ltr">
<div>
<div dir="auto">
<div dir="ltr">Right now I'm looking at matched
pnp's, suitable for a VCO. Something like the
THAT-320 quad pnp would be ideal, but they are kind
of pricey. The quad is nice because you have an
extra matched transistor you can use for high
frequency tracking adjustment.
<div><br>
</div>
<div>I ordered some BCM856's to see how they will
pan out. I think the VBE match will be good
enough, I'm wondering about the base resistance
that causes deviation from ideal log conformance.</div>
<div><br>
</div>
<div>For npn's, THAT-300 or MAT14 are the best, also
pricey.</div>
<div><br>
</div>
</div>
</div>
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