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  • about Test & Measurement
  • Published in issue 7/2010 on page 66
About the article

LED Tester

(Summer Circuits 2010 article)

In some circumstances it may be necessary to select LEDs with closely matched characteristics. This design makes the job a whole lot easier. It uses two tracking current sources to allow the comparison of the two LEDs under test. LED current is adjustable by potentiometer P1 giving a range from 1 to 50 mA.

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