Home » Audio » Group Build » Red & Green 5 mm LED (Graphs - Uf / If / rD.)
Red & Green 5 mm LED [message #87823] Sun, 15 April 2018 14:04
FL152 is currently offline  FL152
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Registered: April 2011
Chancellor
NOS Siemens LR5360-DG standard diffused 5 mm red LED measured / calculated values (If = 10 mA) :

If = 10 mA, Uf = 1,605 V , rD = 3,54 Ω


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Figure 1: Forward voltage Uf against applied current If for 5 mm red LED LR5360-DG


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Figure 2: Dynamic resistance rD vs. applied current If for 5 mm red LED LR5360-DG


Cheap "no name" 5 mm standard diffused green LED measured / calculated values (If = 10 mA) :

If = 10 mA , Uf = 1,98 V , rD = 10,05 Ω


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Figure 3: Forward voltage Uf against applied current If for green "no name" 5 mm LED


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Figure 4: Dynamic resistance rD vs. applied current for green "no name" 5 mm LED


Measured and calculated values are pretty in line with previously published values for similar LEDs, see for example „Valve Amplifiers 4" by M. Jones, pages 44-45.
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