I'm installing an external EMS Warning light (LED) as depicted in the Installation Instructions.
The install manual (page 7-75) states the following:
Aircraft Spruce P/N 17-410 is an example of a light that will work for this application. An LED and resistor in series will also suffice. If you use an LED as the indicator, you must choose a resistor that delivers the appropriate current to the LED, and can accommodate the power required for its current and voltage drop. Also note that the power and ground connections on LEDs are not reversible.
Can anyone tell me the purpose of installing a resistor in series with the LED? Why is it necessary? I've experimented with several resistors: 10k, 5k, and 3.3k and they all seem to allow the LED to operate but at a much reduced intensity.
Any advice will be appreciated.
The install manual (page 7-75) states the following:
Aircraft Spruce P/N 17-410 is an example of a light that will work for this application. An LED and resistor in series will also suffice. If you use an LED as the indicator, you must choose a resistor that delivers the appropriate current to the LED, and can accommodate the power required for its current and voltage drop. Also note that the power and ground connections on LEDs are not reversible.
Can anyone tell me the purpose of installing a resistor in series with the LED? Why is it necessary? I've experimented with several resistors: 10k, 5k, and 3.3k and they all seem to allow the LED to operate but at a much reduced intensity.
Any advice will be appreciated.