2N datasheet 2N component 2N integrated circuit 2N schematic 2N application note N 2N 2N34 2N3. 2N Description = Low Power Field Effect Transistor ;; Case Style = TO18 ;; Geometry = FN ;; Page Number = E28+E Page 1. This datasheet has been downloaded from at this page. Page 2.
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I can sort of understand why TI wouldn’t bother updating an old app note, but I find it strange that LT wouldn’t update one of its “solutions” on its website. Null 4, 10 22 Note that the LM is very old. Post as a guest Name.
The old solutions still work! I understand that the 2N JFET is there to remove the beta error caused by connecting the BJT base directly to the op amp output as in this circuit. Probably updating solutions is not a business priority.
2N_PDF Datasheet Download IC-ON-LINE
If the opamp is powered so that its output can swing to 12 V or so, then just a single modern MOSFET would suffice, even for very large currents. However, you’d need to be careful about the gate capacitance causing stability problems. Both of the example circuits are old; the 2N transistor is a metal-case unit no longer easily available.
Why — was it an electrical limitation or cost or something else? Sign up using Email and Password. Olin Lathrop k 30 That’s what makes it a “precision” current source. The important point here is that all the current goes thru R1. The point of the FET and NPN transistors is to provide current gain so that the output current can be a lot more than the opamp output can provide.
2N3456 – N-CHANNEL SILICON JUNCTION FIELD-EFFECT
In fact, in this case the opamp output current is ideally 0.