2SK170/2SJ74
2SK369
However there's no data on temperature dependence of drain current in the datasheet.
Have fun, Hannes
EDIT: I just saw your RMI-amp uses the 2SK170; so what is your particular interest, the zero tempco for ID? I don't remember that spec in any jfet datasheet, but I only have the abbreviated pdfs.
2SK369
However there's no data on temperature dependence of drain current in the datasheet.
Have fun, Hannes
EDIT: I just saw your RMI-amp uses the 2SK170; so what is your particular interest, the zero tempco for ID? I don't remember that spec in any jfet datasheet, but I only have the abbreviated pdfs.
john curl said:I don't think this will have 0 tc Too much transconductance. You need about 0.7V bias voltage to get 0 tc, and a 170 will not get you there easily.
Zero Tc for k170 is at 13...14mA but at this current is has very high transconductance and it not sound good.
roender said:Characteristics:
low noise
Yfs > 10mS
zero Ids (Vgs) drift with temperature at any current in the range of 2...8mA
There is such device?
I don`t think you`ll easily find a jfet like that.
btw. I`m working on non-global-feedback amplifier and I`m using 2SK170BL/2SJ74BL in the input stage but with servo incuded.
Roender,
There is not (on this planet).zero Ids (Vgs) drift with temperature at any current in the range of 2...8mA There is such device?
AndrewT said:
I seem to recall he said the Vgs should be 800mV above Vpinchoff for closest to temp comp.
VGS = VP + 0.63V for zero TC
http://www.tkhifi.com/div/Erno_Borbely_fet_articel_1.pdf
jacco vermeulen said:Example , not exactly low noise but it has a nice zero TC curve.
Wow, 2n5564 price tag 56GBP at Farnell UK
Thanks, but no thanks!
You could also have a look at interfet, they have some good jfets. Replacements for japanese jfets, and theres also a p channel part. Full specs are not given beyond the obvious but they should be close to the japanese counterparts. IFN146 and 147 are very good. Heres a link maybe theres something you could use, www.interfet.com/pdf/j_equiv.pdf.
Jacco you seem to know where to obtain some difficult parts, have anywhere you know I could get hold of 2SC3067 in big quantaties, but in Europe, Im tired of ordering from east.
Jacco you seem to know where to obtain some difficult parts, have anywhere you know I could get hold of 2SC3067 in big quantaties, but in Europe, Im tired of ordering from east.
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