Adjustable Current Source – 0 to 1A

  • Rajkumar Sharma
  • 88 Views
  • moderate
  • Tested
  • SKU: EL143488
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This voltage-to-current (V-I) converter delivers a well-regulated current to a load. The circuit accepts an adjustable input voltage from Trimmer potentiometer PR1 and converts it to an output current from 0A to 1A. The current is regulated by feeding the voltage across a low-side, current-sense resistor R9 back to the OPAMP. The output Darlington pair allows for higher current gain. Feedback components R8 and C6 provide frequency compensation to ensure the stability of the circuit during transients. They also help reduce noise. R8 provides a DC feedback path directly at the current setting resistor, R9, and C1 provide a high-frequency feedback path that bypasses the NPN pair.

Note: The project can support higher current and voltage ranges by changing the sense resistor, BJT transistor, and Input voltage. It is important to use an appropriate heatsink for Q1 to take care of overheating.

Features

  • Supply 24V
  • Output Current 0 to 1A (Adjustable)
  • PCB Dimensions 41.59 x 30.48 mm
  • 4 x 2.5 mm Mounting Holes

Connections

  • CN1: Pin 1 = GND, Pin + Load Supply 24V DC
  • CN2: Pin 1 = + Load Supply, Pin 2 GND
  • D1: Power LED
  • PR1: Current Adjust 0 to 1A

Schematic

Parts List

Connections

Gerber View

Photos

Video

OPA197 Datasheet

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