Yeah I’m more of a hack than an engineer, I can’t understand diagrams very well so I don’t make them myself.
In the tailcap there is simply a resistor (or pot) and an LED in series, both parallel to the main power switch. So when the clicky switch is ‘off’, a small amount of power flows through the tail LED.
On the driver there is a “bleeder resistor” that bleeds power form Batt+ to the battery tube, completely bypassing the driver. With the right value bleeder, I’m sure the MCU sees some voltage but not enough to boot up or keep an OTC charged.
It’s all very experienced based as far as how it works, I’m not sure what other things influence the operation.
edit: This is the closest I have made to a diagram. I used the “ground” symbol to refer to the flashlight body. It also doesn’t show any bleeder. You get the idea. This is from the original discussion thread Feb ’15
