Maybe because J310 has Idss in the range of 24...60mA, and for microphones we select specimens with small Idss.
JFET shootout
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Wavelength
Well-known member
If not added I would look at LSK170 and LSK189, 2 of my favs. Both super low noise and both have matched pairs available. The LSK189 is really nice as it has a high bias voltage. I use them in pedals and High End Audio all the time.
Great thank for that information. Do you have an supplier, I found this one https://www.digikey.fr/fr/products/detail/linear-integrated-systems-inc/LS846-TO-92-3L-ROHS/14312177. Thank you
Yes, LS846 can be used with very good results. Choose it with small Idss.
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I'm tying to find an IDSS tester / do you any tester that could do the job? I found this on Aliexpress. Thank You
https://fr.aliexpress.com/item/1005...m0dCsrfW&utparam-url=scene:search|query_from:
or
https://fr.aliexpress.com/item/1005...moTDowiR&utparam-url=scene:search|query_from:
https://fr.aliexpress.com/item/1005...m0dCsrfW&utparam-url=scene:search|query_from:
or
https://fr.aliexpress.com/item/1005...moTDowiR&utparam-url=scene:search|query_from:
I recommend something more complex, very useful for DIY. Oscilloscope, signal generator, multitester.
I use it everywhere, I am very satisfied with it.
https://a.aliexpress.com/_omLjN3Q
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Cqwet Dbdfte
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- Oct 2, 2023
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Right, the dynamic range, including noise floor, is defined by the number of bits in an A/D Converter. (How common are full chain non-digital products?)
Noise is sometimes added on purpose to randomize out unpleasant (monotonic) digital artifacts. Noise is unfortunately a fact of life. If not truly random it is a problem.
Depending on "musical" content (opinions vary) , the final product may often, sadly, be compressed to a limited dynamic range, squashing all intents of low noise.
Vinyl records has more limitations on dynamic range, at both ends, and thus enforces some boundaries on program content, which actually may be a good thing.
A two mike Blumlein or three mike a la RCA living stereo, recorded in a slightly reverberant setting, may be too much of a challenge, and underappreciated and a thing of the past.
Noise is sometimes added on purpose to randomize out unpleasant (monotonic) digital artifacts. Noise is unfortunately a fact of life. If not truly random it is a problem.
Depending on "musical" content (opinions vary) , the final product may often, sadly, be compressed to a limited dynamic range, squashing all intents of low noise.
Vinyl records has more limitations on dynamic range, at both ends, and thus enforces some boundaries on program content, which actually may be a good thing.
A two mike Blumlein or three mike a la RCA living stereo, recorded in a slightly reverberant setting, may be too much of a challenge, and underappreciated and a thing of the past.
They have a quite high input capacitance Cgs, about 40pF, which makes them unsuitable for low capacitance capsules.
They also need to operate at significantly higher curret (>2mA) for low noise.
Different applications.
Wavelength
Well-known member
I just buy direct from Linear Systems.
French dist' for Linear Systems:
France
CATS (Solutec & Microel)
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+33-1-69070824 or +33-1-69592150
The 189 is their process 50 replacement and has the exact same specs as the 3819, including an input capacitance of 4pf. Are you thinking of something else or is there something I don't know
Sorry, I confused 189 with 389.
apologies though, i was also wrong in the specifics. the 189 is a single channel version of the 489, which is more of a low impedance version of the 389. it's intended to be a "designer jfet" for low noise impedance conversion. the LS846 is their process 50 replacement. though it is true that both will work in a headamp circuit
Well, my understanding is the lowest-impedance is the 389, and the 489 is kind of medium impedance, with the typical 2N3819 being high impedance, if I'm allowed this simplification.
It will be interesting to see how the 846 performs as a replacement for 2N3819 in a typical common-source stage..
It will be interesting to see how the 846 performs as a replacement for 2N3819 in a typical common-source stage..
Sorry it was late. I meant input capacitance, so the reverse of what I said. My brain swapped the words
