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ultra-low noise transistors. | diyAudio
https://www.diyaudio.com/community/threads/ultra-low-noise-transistors.17285/
If you are looking for ultra low voltage noise (2 ohm base resistance), BFG16A (SOT223A) or BFQ17 (SOT89) might be interesting. Mind you, hFE is not very high and as far as I remember the 1/f corner is not particularly low, so these are not the right transistors if you want low current noise. See www.semiconductors.philips.com for more info.
Low noise transistors | Nexperia
https://www.nexperia.com/products/bipolar-transistors/special-feature-transistors/low-noise-transistors/
Low noise transistors - Minimizing noise in audio and sensing systems Noise is a critical factor in many applications, especially those involving audio or sensing operations. To keep transistor noise to a minimum in your design, look no further than our low noise devices - we're certainly not keeping quiet about their quality performance and small packages.
Search results for: low noise Transistors – Mouser
https://www.mouser.com/c/semiconductors/discrete-semiconductors/transistors/?q=low%20noise
Bipolar Transistors - BJT Low Noise,Matched Dual NPN Transistor Enlarge Mfr. Part # SSM2212RZ. Mouser Part # 584-SSM2212RZ. Analog Devices: Bipolar Transistors - BJT Low Noise,Matched Dual NPN Transistor. Learn More. Datasheet. 31 In Stock. 3,326 On Order View Dates. Alternative Packaging ...
Low Noise Small Signal Transistors | Audiokarma Home Audio ...
https://audiokarma.org/forums/index.php?threads/low-noise-small-signal-transistors.815432/
Anyway, the noise was gone but having no TT at the moment I did not rally test it. This MC amp is a single transistor common base design, I wonder, would such Zetex transistor be a good choice there? The transistor has 2.6 Volts over C to E and a 1k emitter resistor (where the input connects) so it consumes some 2.6 milliamps.
Ultra low noise amplifiers - Dicks-website
http://dicks-website.eu/low_noise_amp_part3/part3.html
Diramics | Ultra Low Noise Transistors
Proven low noise transistor technology used by ESA in their ground stations for >10 years. We offer customizable ultra low noise performance pHEMTS. Hybrid ultra low noise amplifiers by Yebes using the pH-100 technology.
Lowest noise BJT transistor? | diyAudio
https://www.diyaudio.com/community/threads/lowest-noise-bjt-transistor.222485/
For extremely low voltage noise, the Philips/NXP BFW16A used to be a good choice because of its low base resistance, but it is out of production. You could try a more modern low-noise wideband transistor, such as the BFU760F (RB=3.32 ohm according to its Spice model). It will be difficult to keep it stable due to its high transition frequency.
Ultra low noise amplifiers - JanasCard
http://www.janascard.cz/PDF/Design%20of%20ultra%20low%20noise%20amplifiers.pdf
Amplifiers with bipolar transistor offer very low noise but have also some drawbacks – low input impedance and high input current noise, so they are suitable especially for signal sources with low output impedance, typically below 1 kOhm. If high input impedance or very low input noise current is necessary, an input stage with
The Design of Low-noise Audio-frequency Amplifiers
http://www.keith-snook.info/Stuff-you-should-read/Faulkner%20-%20The%20design%20of%20Low-noise%20audio%20frequency%20amplifiers.pdf
The Design of Low-noise Audio-frequency Amplifiers By E. A. FAULKNER, M.A., Ph.D., C.Eng., F.I.E.R.E., M.I.E.E·t Summary: This paper contains: (a) an account of the phenomenological theory of noise in linear amplifiers operating from resistive signal sources; (b) a discussion of the noise parameters of bipolar and junction field
Best transistor to use for audio amplifier - Electrical ...
https://electronics.stackexchange.com/questions/97827/best-transistor-to-use-for-audio-amplifier
Input transistors should be low noise. BJT tend to be lower noise if the correct source impedance (for op amps you can look this up in the datasheet by looking at voltage noise / current noise which for NE5534A at 30Hz is ~5.5/0.0015 = 3k7). JFET has super low current noise so they will tend to have better noise performance with high Z inputs.
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