[sdiy] What do people use for matched transistors these days?

Quincas Moreira quincas at gmail.com
Sat Sep 9 19:07:58 CEST 2023


Ah, I see. That’s what I meant :)
Still, never a problem with neighboring transistors from a strip :)

On Sat 9 Sep 2023 at 11:01 Ian Fritz <ijfritz at comcast.net> wrote:

> Once again, matching is for temperature stability, not for tracking.
>
> On Sep 9, 2023, at 6:36 AM, Quincas Moreira via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>
> 
>
> 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
>
> On Fri 8 Sep 2023 at 17:36 Scott Bernardi via Synth-diy <
> synth-diy at synth-diy.org> wrote:
>
>> 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.
>>
>> 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.
>>
>> For npn's, THAT-300 or MAT14 are the best, also pricey.
>>
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