Electronics > Beginners

LED strip tester will it work

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Zero999:
The only way to prevent reverse polarity from killing an LED strip would be to add a diode in series or reverse parallel with it. There's no way to make the LED tester which will not kill the LEDs, if they're connected up backwards.

DarkZero:
im just trying to figure out how the tester in the video doesn't kill LED's when he reverse bias them and how does voltage doesn't rise above 18v in the video, its demonstrated that it can be done i just cant think of mechanism

Zero999:

--- Quote from: DarkZero on April 13, 2019, 01:36:12 pm ---im just trying to figure out how the tester in the video doesn't kill LED's when he reverse bias them and how does voltage doesn't rise above 18v in the video, its demonstrated that it can be done i just cant think of mechanism

--- End quote ---
I doubt there's anything special about the LED tester being used there. Not all LEDs are killed by reverse voltage. AS long as the current is limited to a very low level, old red LEDs and lime green ones just act like a zener diode and non-destructively conduct, when subjected to overvoltage. Modern blue and white LEDs are much more sensitive and can be more easily destroyed, when reverse biased with too higher voltage, although some of the more expensive, higher powered ones have a built in reverse parallel diode to protect against reverse voltage.

DarkZero:
ah ty Zero999 i didn't know all that. guess its impossible to implement it if its not built into the strip/diode :(

thx alot so much nice info  :-+
 

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