If you are using a 5v (no battery) PT the computer USB port won't supply enough amperage to power LR cartos, and will even be a reduced voltage with a SR carto.
You need to use a powered USB hub rated at 2 amps or higher. The computer USB port is only 1.5amp.
True, but I'm actually using it on my computer and it works. I'm probably not using the full potential/5 volts of the passthrough, but it does fire solid and reliably. Interestingly enough, it will only fire for a second or two and then stop when I try to use my 5v 2amp usb wall powered adapter - I have no idea why, because this is how you're 'supposed' to do it, and that's the only reason I bought the wall adaptor. I also realize that the potential is there to harm the usb port, but the 2.0 ohm boge carto seems to be working in this setup (with the computer power).
Even if the PT is reduced in performance, it's still a satisfying experience. The computer usb port even fires 2.0 dual coils as well, but won't fire 1.5 ohm dual coils. The 2.0 dual coil also acts funny on the 2amp usb wall wart, so the wall adaptor is probably the problem now that I think about it. My 2 amp car usb adapter works fine with everything mentioned though. Weird huh
