I know I still would like to buy the lowest noise jfets for the application, I will use them at various circuit not just for this place, and some will be amplifiers.
Just to make sure I understand, will I get the same noise with all jfets, in this application ?
Will it be buried under the other noise, or will it add up, noticeable or not ?
By the way the signal will be amplifier after.
Just to make sure I understand, will I get the same noise with all jfets, in this application ?
Will it be buried under the other noise, or will it add up, noticeable or not ?
By the way the signal will be amplifier after.
Thank you very much this is gold, that is what I want to learn.
J113 to92 look like the perfect price/performance/availability I will start with this one.
I am looking between the 113 and for buffer alone these :
- 2N4117/A, 2N4118/A,2N4119/A
https://www.mouser.fr/datasheet/2/676/jfet-2n4117-2n4118-2n4119a-interfet.r00-1649084.pdf
- J210, J211, J212
https://www.mouser.fr/datasheet/2/676/jfet-j210-j211-j212-interfet.r00-1649154.pdf
I don't want to go look for discontinued devices.
1mA to 2mA seems to be a universal sweet spot even for tubes !
J113 to92 look like the perfect price/performance/availability I will start with this one.
I am looking between the 113 and for buffer alone these :
- 2N4117/A, 2N4118/A,2N4119/A
https://www.mouser.fr/datasheet/2/676/jfet-2n4117-2n4118-2n4119a-interfet.r00-1649084.pdf
- J210, J211, J212
https://www.mouser.fr/datasheet/2/676/jfet-j210-j211-j212-interfet.r00-1649154.pdf
I don't want to go look for discontinued devices.
1mA to 2mA seems to be a universal sweet spot even for tubes !
Hello All,
This thread is back by request.
I intend to test pairs and groups of four Jfets alone and in composite.
with op-amps
in cascode (in cascode the Jfets produce less heat, less distortion)
Thanks DT
This thread is back by request.
I intend to test pairs and groups of four Jfets alone and in composite.
with op-amps
in cascode (in cascode the Jfets produce less heat, less distortion)
Thanks DT
Went to Mouser and ordered a fistful of ON J113 Jfets. According to the ON product data sheet the J113 has a min of 2ma Idss, no max is given. According to the Mouser page the J113 Idss range is 2ma to 9ma. I hope that this range is not to far from the truth.
The J113 are cheep and easy to get, so we will test them first.
Thanks DT
The J113 are cheep and easy to get, so we will test them first.
Thanks DT
H
HAYK
Just a small question. What is Id of bf862 when gm is 12.5mS.
Among all, I found this jfet most appropriate for LTP pair biased at 12.5mS.
Thank you for this great job, very useful for designers.
Among all, I found this jfet most appropriate for LTP pair biased at 12.5mS.
Thank you for this great job, very useful for designers.
H
HAYK
There is huge difference between DS and measurements of 2sk117,
Post in thread 'JFET’s J113, 2SK170, 2N5457 and others' https://www.diyaudio.com/community/threads/jfets-j113-2sk170-2n5457-and-others.340796/post-5870416
Post in thread 'JFET’s J113, 2SK170, 2N5457 and others' https://www.diyaudio.com/community/threads/jfets-j113-2sk170-2n5457-and-others.340796/post-5870416
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Few years ago i buyed 500 pcs.
53 pcs 9-13mA Idss
182 pcs 13-17 mA Idss
rest 17-26 mA idss
Measured at 15vds, same as Vds at datasheet.
Please compare your batch. Maybe there is difference related to Idss spread.