Precision current source using OPAMP and MOSFET

Precision current source using OPAMP and MOSFET

 

Bill of Material:


Design Considerations:

  • Resistor R2 must be selected such that there is enough current drive to the load
  • Zener diode D1 must be selected such that the GATE drive is below threshold
  • It is preferred that opamp has low offset characteristics
  • Ensure that R1 is selected such a way that Power dissipation of the Zener is not exceeded

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