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MOSFET AUDIO AMPLIFIER(Low Noise and High Gain) : 6 …
https://www.instructables.com/MOSFET-AUDIO-AMPLIFIERLow-Noise-and-High-Gain/
Small signal MOSFETs - Nexperia
https://www.nexperia.com/products/mosfets/small-signal-mosfets/
Low noise high voltage mosfet or jfet - diyAudio
https://www.diyaudio.com/community/threads/low-noise-high-voltage-mosfet-or-jfet.351404/
(MOSFETs are prone to 1/f rumble so rarely a first choice in low-noise work.) And if this potentiometer *reduces* signal, then the hiss is dominated by the stage *after* the pot. Not the buffer before the pot. Having 350V when you need 30V is a minor problem. There are many ways to reduce DC voltage, and you can also design-in filtering.
1. Noise sources in MOSFET transistors. - Nikhef
https://www.nikhef.nl/~jds/vlsi/noise/sansen.pdf
Planet Analog - Amplify small signals in low-noise circuit ...
https://www.planetanalog.com/amplify-small-signals-in-low-noise-circuit-with-discrete-jfet/
Amplify small signals in low-noise circuit with discrete JFET. Amplifying the small signals produced by sensors in a low-noise circuit is a very common but difficult problem. Designers will often use an operational amplifier (op amp) with bipolar inputs to achieve this amplification, given their inherently low flicker (1/f) and broadband noise.
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