Is there an already baked schematic of an Aleph J with N-channel JFETs on the input?
I have bought some 2SK170 parts on speculation and they appear to be genuine with some good matches. So far, no luck fining genuine 2SJ74 on spec that are genuine and are resonably priced.
I am matching for Idss and gain around the 5mA bias point.
I have bought some 2SK170 parts on speculation and they appear to be genuine with some good matches. So far, no luck fining genuine 2SJ74 on spec that are genuine and are resonably priced.
I am matching for Idss and gain around the 5mA bias point.
btw. MMBFJ271 is cheap
of course , you need some setup for matching ...... an you still can solder these with decent solder station ....
Thank you for the inverted links. I will save those designs.
Is the MMBFJ271 as low noise as the 2SJ74?
I bought a SOT23 socket and this might be a good part to start using that socket with.
for line level duty , which is the case here , I don't care for noise difference between Toshiba JFets and J271
no direct complement , though I have bunch of J309 with bunch of J271
one day I'll maybe make something of them , together
Thanks. I will order some of the SOT23 version of the J271 and see how they measure and how they work in circuit. You are correct that the SOT version is much less cost than the TO92 version. More important, they are actually in production and available.
The SOT23 version datasheet is very quiet about noise. The TO92 datasheet says that noise is maybe 10X of the Toshiba part. As of today, I do not have a way to measure the noise. That is on the list to acquire or build.
You might find this thread interesting:
UDNeSS, or You don't need Semisouth's
This is a J2-like topology using j113 for the input stage.
UDNeSS, or You don't need Semisouth's
This is a J2-like topology using j113 for the input stage.
making Aleph J from Babelfish ᄅſ....or FW J2 on Steroids .... or Not your Father's J2! is trivial
You have a natural talent for making complicated designs.
BTW, there is something weird going on with Q2's emitter and Q3's base.
yup, deleted resistors
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