The bleeder resistor or LDO acting as such, confuses me still.
Whenever we add some leds across the tail switch we are sending power to the driver, albeit a very small amount.
When I added a glowing tail cap light on my Eagle Eye X2R the light works fine in all modes, but it loses its off time memory and operates as if it has next mode memory. I need to add a 680 ohm bleeder resistor to the driver and that’s supposed to make the memory work properly.
This is still one of those flashlight gray areas for me. Pilotdog68 might know more since he built a lot of tail switch led pcb’s.
I THINK, emphasis on think, that the job of the bleeder resistor is to cause the electrical current to bypass the driver which then allows the driver to function normally. The amount of current drawn from the tail cap LEDs needs to be taken into account in order to find the correct size of bleeder resistor.
Here is a bleeder on the X2R driver. It’s 680 ohm and goes from the battery positive to ground.
I’ll add some more pictures of bleeder resistors as I find them:
Below looks like 220 ohm.
Another 680 ohm below.
Below looks like 600 something.
Below is 680 ohm.
Link
I think I’m getting a feel for it. Try it without a bleeder resistor, if it needs one, just add it (500-700 usually).
Here is my own X2R with a 680 ohm resistor. Unfortunately it did not fix my memory problem.
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