If incase we don't have any idea about the forward current ratings for an L.E.D while purchasing or getting it from somebody then how to calculate the maximum required forward current rating ???
I dont know my friend, I see you stuck with these LEDs. :smile:
Sometimes is easier to buy new from catalog with known manufacturer, model ID and good datasheet then to experiment and destroy LEDs on test.
LEDs what you show in previous thread 3mm 5mm or 8mm THT LEDs usually have current ratings 25mA 35mA, not more. Monitor heating of LEDs body and legs on short and long time.
If LEDs are white, supply 3,4V to LED and measure current.
I dont know my friend, I see you stuck with these LEDs. :smile:
Sometimes is easier to buy new from catalog with known manufacturer, model ID and good datasheet then to experiment and destroy LEDs on test.
LEDs what you show in previous thread 3mm 5mm or 8mm THT LEDs usually have current ratings 25mA 35mA, not more. Monitor heating of LEDs body and legs on short and long time.
If LEDs are white, supply 3,4V to LED and measure current.
You can try, but for testing current you need more current reserve. This small tiny battery maybe is old and weak to supply needed current and this can give wrong reading in your test.
You can try, but for testing current you need more current reserve. This small tiny battery maybe is old and weak to supply needed current and this can give wrong reading in your test.
As LED's are current sensitive devices, testing them with a direct variable power supply or 3.6 volt battery is never recomended. Try searching a constant current source to test led's. Connecting the X led to the tester and measuring the voltage across will give you the 99% perfect forward voltage of a unknown LED. make a small handly circuit shown below to test almost any through hole LED's
As LED's are current sensitive devices, testing them with a direct variable power supply or 3.6 volt battery is never recomended. Try searching a constant current source to test led's. Connecting the X led to the tester and measuring the voltage across will give you the 99% perfect forward voltage of a unknown LED. make a small handly circuit shown below to test almost any through hole LED's
As LED's are current sensitive devices, testing them with a direct variable power supply or 3.6 volt battery is never recomended. Try searching a constant current source to test led's. Connecting the X led to the tester and measuring the voltage across will give you the 99% perfect forward voltage of a unknown LED. make a small handly circuit shown below to test almost any through hole LED's