Hi
In my circuit I want to have a red HE LED light when my 9v pp3 battery is applied the WRONG way round as a warning light. problem is the reverse voltage of the led max is 5v and this is what it needs to be when the battery is the right polarity.
I have tested the led the wrong way round and it did not damage it but it worries me having it like this as I fear it may damage it if applied long enough, so I thought of using a resistor.
Its a 12v high effciency red and reverse amps is 10 micro amps. Using ohms law 9v-5v=4v, ohms law is volts = amp x ohms. So my 4v i want to illimante in the formula is 4v / 0.00001 = 400000 ohms or 400k or 0.4M, Is this correct.
I also wondered whether it would be better to put another diode that can take 9v reverse voltage in series with it rather than use a resistor
What would you do, use a resistor (tell me if I am wrong with this rating of ohms), the other diode in series or nothing at all and let the led take the 9v in reverse. I will attach the data sheet for the led.
Thank you for any help provided and for reading.
In my circuit I want to have a red HE LED light when my 9v pp3 battery is applied the WRONG way round as a warning light. problem is the reverse voltage of the led max is 5v and this is what it needs to be when the battery is the right polarity.
I have tested the led the wrong way round and it did not damage it but it worries me having it like this as I fear it may damage it if applied long enough, so I thought of using a resistor.
Its a 12v high effciency red and reverse amps is 10 micro amps. Using ohms law 9v-5v=4v, ohms law is volts = amp x ohms. So my 4v i want to illimante in the formula is 4v / 0.00001 = 400000 ohms or 400k or 0.4M, Is this correct.
I also wondered whether it would be better to put another diode that can take 9v reverse voltage in series with it rather than use a resistor
What would you do, use a resistor (tell me if I am wrong with this rating of ohms), the other diode in series or nothing at all and let the led take the 9v in reverse. I will attach the data sheet for the led.
Thank you for any help provided and for reading.