I have a circuit board from an electronic 4WD switch.
It had two "regular" green LEDs, not superbright or anything, just your average 3mm indicator LED. I don't know what the voltage of these LEDs are but the system voltage is 14.5V, and the LEDs use 690 Ohm resistors.
I replaced the green LEDs with super bright blue LEDs (3.4V, 20mA) but let the resistors in place.
The problem I'm experiencing now is when the system voltage is 12-14.5 V the blue LEDs I swapped in remain lightly lit when they should be off.
Which resistor value should I replace the 690 Ohm resistors with so that these blue LEDs are fully off when they're supposed to be off.
I may just experiment with it and drop in a higher value resistor. The LEDs do NOT need to be at full brightness when they're "on", they just need to be completely off when they're supposed to be off.
It had two "regular" green LEDs, not superbright or anything, just your average 3mm indicator LED. I don't know what the voltage of these LEDs are but the system voltage is 14.5V, and the LEDs use 690 Ohm resistors.
I replaced the green LEDs with super bright blue LEDs (3.4V, 20mA) but let the resistors in place.
The problem I'm experiencing now is when the system voltage is 12-14.5 V the blue LEDs I swapped in remain lightly lit when they should be off.
Which resistor value should I replace the 690 Ohm resistors with so that these blue LEDs are fully off when they're supposed to be off.
I may just experiment with it and drop in a higher value resistor. The LEDs do NOT need to be at full brightness when they're "on", they just need to be completely off when they're supposed to be off.