Electronics > Beginners
LED connection in series
james_s:
It's pretty easy to determine the forward voltage, many multimeters have a diode check function that will do it, or you could hook up a single LED in series with a 1k or so resistor to a 9v battery and measure the voltage across the LED.
Zero999:
--- Quote from: james_s on December 12, 2018, 12:37:54 am ---It's pretty easy to determine the forward voltage, many multimeters have a diode check function that will do it, or you could hook up a single LED in series with a 1k or so resistor to a 9v battery and measure the voltage across the LED.
--- End quote ---
The meter diode check often only works up to 2V, so a 9V battery and 1k resistor is better. Watch out though, as the maximum reverse voltage rating for some LEDs is below 9V, although I've personally never destroyed an LED by subjecting it to 9V reverse bias, so it could be the manufacturers covering themselves.
james_s:
My Fluke meter goes up higher than that, but it varies from one meter to another.
I wouldn't worry about damaging an ordinary LED with a 9V battery so long as the current limit is reasonably low. You only need to test a sample anyway, once you know the forward drop of that color you can assume the others of its type are about the same.
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