[sdiy] Dual Matched N JFET from Linear

[brianw]

Wow!

The Application Note for the LSK389 was written by Bob Cordell. I have his excellent book on Designing Audio Power Amplifiers. It's always nice when technology companies employ talented technical writers to explain their products. It's usually like getting a free course in electronics design.

I could not find a date on the App Note, but it cites references as recent as 2019 (that most recent one being his own book, ha!).

Brian Willoughby

https://www.linearsystems.com/_files/ugd/7e8069_5339d0e5c21c409abccc4701d82d1976.pdf


On Jun 20, 2025, at 1:52 PM, Mike Bryant <mbryant at futurehorizons.com> wrote:
> LSK389 is hardly new.  Been around for a long time, although availability varies.
> But the price never seems to vary.  
> 
> From: Tim Parkhurst
> Sent: 20 June 2025 21:34
>  
> Hey, Analog Hounds, 
> 
> Linear Systems is promoting a new Matched Dual JFET, and you might even be able to get a sample or two. Useful? Not? 
> 
> https://www.linearsystems.com/post/why-engineers-choose-the-lsk389-for-high-precision-analog-design?utm_campaign=d2b0395f-db24-487d-8e02-adcff714e7a8&utm_source=so&utm_medium=mail&cid=a05ef50a-a9c5-473d-950b-37f3f1a2d83d
> 
> Tim (define "useful") Servo