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Designing JFET Audio PreAmplifiers
http://www.rason.org/Projects/jfetamp/jfetamp.htm#:~:text=The%20Junction%20Field%20Effect%20Transistor%20%28JFET%29%20offers%20very,conventional%20bipolar%20transistors%20but%20offers%20superior%20overall%20performance.
JFETs: The New Frontier, Part 1 | audioXpress
https://audioxpress.com/article/JFETs-The-New-Frontier-Part-1
JFETs provide extremely high resolution, bringing out more details, sounding cleaner, clearer, and more natural than the best bipolar transistors …
An All-JFET Amplifier: Exploring Modern JFETs Circuits ...
https://audioxpress.com/article/an-all-jfet-amplifier-exploring-modern-jfets-circuits
Toshiba Semiconductors manufactured many junction field-effect transistors (JFETs) for audio applications: the 2SJ74/2SK170, the 2SJ103/2SK246, and the 2SJ104/2SK364 to name a few. Once production of these through-hole …
Audio Amplifiers - JFET - InterFET
https://www.interfet.com/audio-amplifiers/
JFETs and MOSFETs
https://www.sound-au.com/articles/fet-applications.htm
JFETs for RF applications will usually have lower capacitance than devices intended for low noise audio (for example). The capacitance is primarily due to the thickness (or otherwise) of the P-N junction that separates the gate from the channel.
Which JFets for audio use? (other than the 2SK170,389,109 ...
https://www.diyaudio.com/community/threads/which-jfets-for-audio-use-other-than-the-2sk170-389-109-and-74.50364/page-4
Do you know of any JFETs that are still in production and are worth considering for audio applications? (Other than the Toshiba clones LSK170 and LSJ74 by Linear Systems). The BF862 shows up in projects from time to time. People who have done measurements say it has good to excellent performance, even though it is NOT characterized for audio use.
Simple JFET Audio Preamps - Ciphers By Ritter
http://www.ciphersbyritter.com/RADELECT/PREJFET/JFETPRE.HTM
Here is a tested design for a simple, relatively low-noise, JFET-input, 3-transistor audio preamp, designed to satisfy various goals: Minimum Components: Three amplifying transistors and a few resistors and capacitors. Battery Operation: Use a single 9V battery down to 4V. Low Current: Typically under 2mA down to 0.5mA or less.
EETimes - Discrete audio amplifier basics - Part 2: JFETs ...
https://www.eetimes.com/discrete-audio-amplifier-basics-part-2-jfets-mosfets-and-other-circuit-configurations/
JFETs mainly have good high-frequency characteristics, particularly the N-channel types, of which there are some designs capable of use up to 500 MHz. Modern types can also offer very low noise characteristics, although their very high input impedance will lead to high values of thermal noise if their input circuitry is also of high impedance; however, this is within …
The Power JFET Amplifier – Zen Variations #8 - PassDiy
https://www.passdiy.com/pdf/ZV8_power_jfet.pdf
attractive for audio amplifier design. Small signal JFETs are routinely used in the input stages of the finest solid-state amplifiers and preamplifiers, where they give very high input impedance, high linearity, and very low noise. JFETs are routinely extolled in promotional literature for their “tube-like” qualities.
The Beast with a Thousand JFETs. - FIRST WATT
https://www.firstwatt.com/pdf/art_beast.pdf
Being complementary types, they make excellent follower (“buffer”) circuits for audio applications. Here is an example of such a circuit: An “N” channel Jfet (2SK170) and a “P” channel Jfet (2SJ74) are joined at the Source and Gate pins, and the Drains are attached to V+ and V- power supply voltages. The relationship
Low-Noise JFETs Ð Superior Performance to Bipolars
https://www.vishay.com/docs/70599/70599.pdf
Low-Noise JFETs Ð Superior Performance to Bipolars Introduction Junction field effect transistors continue to outperform the best bipolar transistors on low-frequency noise at source impedances as low as 5 k . With higher source impedances, common in sensitive transducers, the JFET amplifiers exhibit dramatically lower noise figures.
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