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-   -   UGS MUSES Scion Preamplifier. (https://www.diyaudio.com/forums/analog-line-level/339502-ugs-muses-scion-preamplifier.html)

Oneminde 5th July 2019 07:27 PM

I don't know what you are doing, but I am writing an article or more correctly, collecting material for the JFET Companion where the goal is to have as much as possible collected on JFET functionality, mathematical calculations & formulas, definitions, explanations of different amplification architectures and illustrations. For someone who does not know these things (like me), this will be a great document once its done.

Oneminde



PRR 6th July 2019 01:54 AM

> collecting material for the JFET Companion where the goal is to have as much as possible collected on JFET functionality, mathematical calculations & formulas, definitions, explanations of

https://www.amazon.com/Designing-Fie.../dp/0070575371

http://www.bitsavers.org/components/...stors_1981.pdf

Oneminde 6th July 2019 10:16 AM

Thanks for the material, I will go over it and check if it contain something useful that I can add.



Oneminde 10th July 2019 04:48 PM

The JFET Companion is complete.

- The JFET companion was written to be a support for learning and understanding JFETs and assorted quality factors. It contains both definitions and key descriptions found in different lectures and articles. The reference material can be found at the end of this paper if you wish to read the sourced material in its entirety. Due to different “styles” used in describing what JFETs are, their function and how to operate them, I have taken the liberty to reorganize the literature in such a way that it is more coherent and linear, from simple to advanced.

- This document was created in part to teach myself what JFETs are in order to quantitatively and objectively perform calculations, simulations and measurements, and as support for a preamplifier project I am working on. It’s the authors first time being involved in an electronics project on this scale, so it was important to collect information and data such that the project could proceed with a focus on quality and great understanding of what’s involved when selecting JFETs and controlling their range of operation with a minimum set of damaging and destructive parameters for music reproduction.

- Although this document will focus on JFETs, I have included a bonus section which will cover a few amplification stages and topologies as well as describing the underlying structure of the preamplifier that I am personally working on. The preamplifier use something called a Voltage and Current Buffer and what that is among other things will be covered in the bonus section, but is not essential for the JFET section.

You can read online or download: The JFET Companion.pdf - Google Drive

Oneminde



AuroraB 15th July 2019 07:11 PM

Very nice!! I'll study it in detail.... and to your previous question - yes , I am..;)

Oneminde 15th July 2019 07:48 PM

Quote:

Originally Posted by AuroraB (https://www.diyaudio.com/forums/analog-line-level/339502-ugs-muses-scion-preamplifier-post5853011.html#post5853011)
Very nice!! I'll study it in detail.... and to your previous question - yes , I am..;)

Cool.
99% of the material in the companion isn't mine, but a friend of mine who is rather clever when it comes to math found a few flaws with some of the formulas. So we'll eventually go over it and correct the mistakes and upload an edited version asap we have some time left over.



AuroraB 15th July 2019 08:23 PM

- but who are you at HFS?

Oneminde 15th July 2019 08:25 PM

Quote:

Originally Posted by AuroraB (https://www.diyaudio.com/forums/analog-line-level/339502-ugs-muses-scion-preamplifier-post5853085.html#post5853085)
- but who are you at HFS?

No one. I went over UGS thread as a precursor to the original French threads. Still have some left to go over.

Oneminde



Alex_twn 20th July 2019 03:12 AM

Great thread Oneminde, very interesting and detailled.
I'll follow this with a lot of interest ;).

PRR 20th July 2019 04:26 AM

You have a link to Rod Elliot's site. This month he began moving it off an annoying host-service to another host and URL.
Elliott Sound Products (ESP) website

I would object to the notion that "BJTs are current controlled" (pg5) but it does depend on the user's level of enlightenment. Enhancement vs depletion normal biasing is also different. Cherry-Hooper Low Pass Amplifiers is a thick read but gives a unified insight.


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