Semisouth just announced a new depletion mode SiC JFET, the SJDP120R340. The voltage rating is 1200V like the other players, but with an RDSon of 340 mohm. This of course means a much smaller die area than previous products, which already have small die and a consequently somewhat challenged junction-to-case thermal resistance.
Having said that. this one might be just the thing for some maniacal line level app - get your thinking caps on! The price is supposedly $7 in 1k quantities, which should make it reasonably affordable even in small lots. It's so new that the data sheet wasn't up last time I looked (recently) at the Semisouth web site.
Having said that. this one might be just the thing for some maniacal line level app - get your thinking caps on! The price is supposedly $7 in 1k quantities, which should make it reasonably affordable even in small lots. It's so new that the data sheet wasn't up last time I looked (recently) at the Semisouth web site.
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That's the one - the data sheet wasn't up when I was looking around a couple of days ago - still isn't, to a certain extent, as there are almost as many TBDs in the spec sheet as there are real numbers. I guess I won't be holding my breath until I see product...
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we need to see the capacitance curves - some of these SiC JFETs look fine until you dive into the capacitance curves at the lower voltages you might want to use for a headphone amp.
who said anything about running low voltage? 😉 but I take your point.
the iron I would probably use is a potted transformer I bought some time ago for a dac build but went a different way and it has 2 x 25-0-25vac and 2 x 45-0-45vac secondaries for a total of 140va actually it might have been higher, thats the right voltages but I cant remember what I specced the current at
the iron I would probably use is a potted transformer I bought some time ago for a dac build but went a different way and it has 2 x 25-0-25vac and 2 x 45-0-45vac secondaries for a total of 140va actually it might have been higher, thats the right voltages but I cant remember what I specced the current at
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nice one, yeah i've been eyeing the r100A off too. what are you using for the VAS? more semisouth, or am I looking at it on the left?
6Ж9П and 6П41С for "VAS" and half of output stage. The rest is secret (commercial project) 😀
What you se there to the right of it, are transistors for voltage stabilizers and filament Shottky rectifier.
Edit: I never use "VAS". The whole amp amplifies power.
One more picture: http://wavebourn.com/forum/download.php?id=681&f=7
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I would like to comment but I just couldn't figure out anything worthwhile to say???
TBD
TBD
TBD
Oh, codo's wrenchone for finding a few interesting parameters but RdsON??? Are you kidding? This is a classA thread? I have a little bias there. If it isn't 10mohms or less I don't care. The last FET I played with a few weeks ago was an IRF6894 and whatever on top, but, I believe it's rated at .9mohms. I'm not braggin, or pushin this part but, RdsON? I guess if yor building something like an F5 Turbo RdsON is important...
O.K. enough of that, sorry wrenchone but, Semisouths introduction is a total flop to eveyone possibly interested IMHO 😕
Thanks for letting us know about this though wrenchone, it may prove to be another usefull part???
TBD
TBD
TBD
Oh, codo's wrenchone for finding a few interesting parameters but RdsON??? Are you kidding? This is a classA thread? I have a little bias there. If it isn't 10mohms or less I don't care. The last FET I played with a few weeks ago was an IRF6894 and whatever on top, but, I believe it's rated at .9mohms. I'm not braggin, or pushin this part but, RdsON? I guess if yor building something like an F5 Turbo RdsON is important...
O.K. enough of that, sorry wrenchone but, Semisouths introduction is a total flop to eveyone possibly interested IMHO 😕
Thanks for letting us know about this though wrenchone, it may prove to be another usefull part???
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Well, as I said. I'm looking at it for some sort of perverse line amp. Even its big brother the 085 has trouble dissipating a lot of power because of the small die size.
Really? I have some 085s but haven't done any testing yet. How much Pd do you expect at what temp for the 085? Or what where you pushing it to in your Le Mutant project?
Thx
Thx
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I use the 085 in my "SiC Puppy" SE amp. In that application, I push about 35W through the device.The thermal ruminations are gone through in that thread - I won't rehash them here. Any plans I might have for the new device are in abeyance until I actually see some, and I can finish up some of the other projects (way, way too many) that are littering my bench.
Here is some info you both might have. I need to do something with mine, but hte queue only grows instead of shrinking.
http://www.diyaudio.com/forums/pass-labs/190438-ss-120r085-depletion-mode-jfet-17.html#post2955976
http://www.diyaudio.com/forums/pass-labs/190438-ss-120r085-depletion-mode-jfet-17.html#post2955976
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