Hi,

I found a voltage controlled current source circuit as follows:

http://www.daycounter.com/Circuits/Current-Servo/Current-Servo.phtml

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Is it a 'linear' or 'switching' circuit? The article mentions that Q1 is a MOSFET. In fact I wish to have a 'linear' type. For the rating shown in figure above, i.e. 150V and 3A, would you please recommend an MOSFET or BJT? The load is inductive and the current is DC current.

Another circuit:

http://www.luciani.org/geda/util/matrix/index.html

What's about this one? 'Linear' or 'Switching? Why is the feedback connected to non-inverting input of the op-amp?

Thank you very much.

I found a voltage controlled current source circuit as follows:

http://www.daycounter.com/Circuits/Current-Servo/Current-Servo.phtml

Is it a 'linear' or 'switching' circuit? The article mentions that Q1 is a MOSFET. In fact I wish to have a 'linear' type. For the rating shown in figure above, i.e. 150V and 3A, would you please recommend an MOSFET or BJT? The load is inductive and the current is DC current.

Another circuit:

http://www.luciani.org/geda/util/matrix/index.html

What's about this one? 'Linear' or 'Switching? Why is the feedback connected to non-inverting input of the op-amp?

Thank you very much.

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