I created for myself a x100 gain low-noise measuring amplifier with NE5534AN. It is powered from 2x 9V batteries and has a DC blocking input capacitor.
A microphone pre-amplifier with a DC blocking capacitor should work. You may have one already.
Ed
Ed
2SK3557-6-TB-E is a possible replacement. One could try 2SK209 as well. Since I had a enough BF862 to build mine, I did not try 2SK3557-6-TB-E, even though I bought enough of them to use but did not perform a second build.
This is the Mouser shopping cart I put together for my build
https://www.mouser.ca/ProjectManage...jectGUID=3a263434-d02b-4f65-859b-ffa8831c6f0a
This is the Mouser shopping cart I put together for my build
https://www.mouser.ca/ProjectManage...jectGUID=3a263434-d02b-4f65-859b-ffa8831c6f0a
Attachments
cph3910
< https://www.digikey.de/de/products/...-E/4847608?s=N4IgTCBcDaIMYAcAWBmAnARgAwgLoF8g >
Fits on sot-23, 16 pcs. in par. got me 0.35 nV/rt Hz at Id = 47 mA total.
NSVJ3910 is the same, IIRC even same marking. You cannot tell them apart
when taken out of the tape.
There are also JFE140 by TI, not pin compatible, but with protection diodes.
There is a thread on them started by TI FAEs in the sellers section.
Performance-wise in the same class. I have a few, but not tested.
< https://www.diyaudio.com/community/threads/ultra-low-noise-jfets-from-texas-instruments.375079/ >
< https://www.digikey.de/de/products/...-E/4847608?s=N4IgTCBcDaIMYAcAWBmAnARgAwgLoF8g >
Fits on sot-23, 16 pcs. in par. got me 0.35 nV/rt Hz at Id = 47 mA total.
NSVJ3910 is the same, IIRC even same marking. You cannot tell them apart
when taken out of the tape.
There are also JFE140 by TI, not pin compatible, but with protection diodes.
There is a thread on them started by TI FAEs in the sellers section.
Performance-wise in the same class. I have a few, but not tested.
< https://www.diyaudio.com/community/threads/ultra-low-noise-jfets-from-texas-instruments.375079/ >
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The CPH3910 is an RF JFET, it will likely have a high 1/f knee as this usually isn't important for RF devices (except those meant as oscillators).
BTW the TI part is the JFE150, not JFE140.
BTW the TI part is the JFE150, not JFE140.
BF862 is a RF jfet as well but that’s what Sam chose to use so I followed along.
So is 2SK3557-6-TB-E, intended for RF, to bad no 1/f graphs in the specs.
Maybe 2SK209 is a better choice since it’s not an RF jfet.
So is 2SK3557-6-TB-E, intended for RF, to bad no 1/f graphs in the specs.
Maybe 2SK209 is a better choice since it’s not an RF jfet.
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Something strange just happened to the Mouser shopping cart I referenced above, there is only one item in the cart now, so how did that happen?
I'll call Mouser support
I'll call Mouser support
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What web page? "Cart:SG LN preamp"
Were you in there deleting all the parts? I have an investigation going on as to what happened to all the items in the cart.
Were you in there deleting all the parts? I have an investigation going on as to what happened to all the items in the cart.
If you use this link what do you see?
https://www.mouser.ca/ProjectManage...jectGUID=3a263434-d02b-4f65-859b-ffa8831c6f0a
does it take you to
https://eu.mouser.com/
https://www.mouser.ca/ProjectManage...jectGUID=3a263434-d02b-4f65-859b-ffa8831c6f0a
does it take you to
https://eu.mouser.com/