<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">Once again, matching is for temperature stability, not for tracking.</div><div dir="ltr"><br><blockquote type="cite">On Sep 9, 2023, at 6:36 AM, Quincas Moreira via Synth-diy <synth-diy@synth-diy.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="auto">For a long time I’ve just been using neighboring resistors from the same strip. Manufacturing processes are more precise these days, All my oscillators track well this way</div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri 8 Sep 2023 at 17:36 Scott Bernardi via Synth-diy <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>> wrote:<br></div><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="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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