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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Why — was it an electrical limitation or cost or something else? Note that the LM is very old. The important point here is that all the current goes thru R1.
Home Questions Tags Users Unanswered. The old solutions still work! Post as a guest Name. That’s what makes it a “precision” current source. Whit3rd 4, 10 Sign up using Email and Password. In fact, in this case the opamp output current is ideally 0. 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.
Probably updating solutions is not a business priority.
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However, you’d need to be careful about the gate capacitance causing stability problems. There is no error due to base current.
(PDF) 2N3456 Datasheet download
Both of the example circuits are old; the 2N transistor is a metal-case unit no longer easily available. Sign up using Facebook. Olin Lathrop k 30 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.
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 datasueet in this circuit.