Why 2 resistors instead of one?maybe use two resistors for R2, 2.35 M 1%
and a 20 turn pot,
I don't know, the question is purely theoretical, I was also minding if the op amp itself would driftEverything has some temperature dependence. What tempco on the resistors, particularly the trimmer ?
Why 2 resistors instead of one?
I don't know, the question is purely theoretical, I was also minding if the op amp itself would drift
I was also minding if the op amp itself would drift
As Wayne already replied that (old soldier) op amp will be the weakest link for DC stability in that schematic among several (like PS rails).We have several ways to remove DC after an op-amp output, among them : AC coupling with a capacitor, Servo DC circuits, ..
I guess we could also bias one of the inputs, something like that :
View attachment 119254
Is that method reliable? Will it drift with temperature? Will it be stable over a long time?
Long term stability is always an issue with such trims.Originally, I was looking for ways to trim the differential offset of a THAT 1646 (for reasons that would be long to explain here), and I thought of trimming the op amp driving the 1646 to achieve the goal.
Then I was just minding if this way of biasing an op amp was stable enough, just for the sake of learning.
All drift, its when its not acceptable. NE5532 is strapped like that in many balanced line driver circuits. But I wouldn't use it as a buffer in an oscilloscope. So it depends on the application. DC coupling is the best.Why 2 resistors instead of one?
I don't know, the question is purely theoretical, I was also minding if the op amp itself would drift
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