Simple Circuits

Current Source for Grounded Load Schematic Circuit Diagram

Creating a current source (as opposed to current sink) for driving a grounded load can be a bit awkward. Admittedly the suggested circuit cheats a little in that the load is tied to virtual ground; still, it is potentially useful.

Current Source for Grounded Load Schematic Circuit Diagram

 

Two control loops are involved here:

Opamp A1 maintains the ‘cold’ end of the load at virtual earth and

A2 sets a current I = –V1/R1, which also flows through the load RL.

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