Is there any problems with applying a reverse V that is
- posted
16 years ago
Is there any problems with applying a reverse V that is
As long as you are sure that the reverse voltage is not more than the rated Vr, the LED will be fine. The series resistor doesn't help, because if the voltage is high enough for it to do anything (meaning that the resistor is controlling the reverse current), the LED is already damaged.
Usually, no problems, especially if resistor-limited.
In my experience, it is common for LEDs to be rated for max. 5 volts reverse voltage and have a high rate of doing nothing wrong with 12 volts reverse. Problem here: If anything goes wrongo, blooie or blammo then it's on the one making products with LEDs being "abused".
Some things to keep in mind:
- Don Klipstein ( snipped-for-privacy@misty.com)
A 10,000 ohm resistor? that seems high for a led forward bias resistor and any reasonable power supply voltage.
Just play it safe and put a diode in there to protect it against reverse bias.
Most leds are rugged enough to take some current limited reverse voltage so it may work fine, but if the led costs money or is hard to change out, a 5 cent diode makes more sense.
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No.
No need.
Graham
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