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  1. mamu

    Raptor Flip-Top VV Mod with 20A, 120W dc/dc converter...

    Why would you do that? There's nothing to stop output if it's directly connected to input.
  2. mamu

    Raptor Flip-Top VV Mod with 20A, 120W dc/dc converter...

    Double-check the pull-down resistor's soldered connections then to make sure it's secured. Also, double-check the wiring to the fire switch's contacts to make sure nothing is touching each other there.
  3. mamu

    Arlo - dual 18650 DNA20/30 step-by-step how-to

    Great idea, Nomoreash. Sweet mod you made. The carbon fiber really does give it pizzazz.
  4. mamu

    Raptor Flip-Top VV Mod with 20A, 120W dc/dc converter...

    Sounds like you don't have the pull-down resistor wired in.
  5. mamu

    PTH08T221W - 16A 88W w/ UVLO...

    After tinkering with various value resistors and seeing what actual cutoff voltage is vs calculated cutoff voltage, I think we're lucky that we have a narrow cutoff voltage range and that range seems to be in a linear portion because the fudge factor of calculated vs actual is the same for our...
  6. mamu

    Raptor Flip-Top VV Mod with 20A, 120W dc/dc converter...

    20A is my limit, and that is even way beyond my usual amp draw, so no don't have plans working with any converter with higher amps. I believe there's thread here though with a 60A one.
  7. mamu

    PTH08T221W - 16A 88W w/ UVLO...

    Hi ecat! Thanks so much for helping. I already have pin 11 wired with the UVLO resistor between it and ground as that's the only way to get UVLO regulation (see pic below). Edited to make this the short version. :laugh: The converter is working aok with the N.O. switch how I have it wired...
  8. mamu

    PTH08T221W - 16A 88W w/ UVLO...

    It's still a work in progress. FET with no pull-up resistor causes firing with and without pressing the switch. FET + pull-up resistor with N.O. switch works, and no FET with N.C. switch works.
  9. mamu

    Raptor Flip-Top VV Mod with 20A, 120W dc/dc converter...

    Sense is a part of the converter's feedback loop that monitors (senses) if there is any voltage drop between the board and the load (atty) and if there is, the converter will compensate for it. Sense wasn't mentioned anywhere in the Raptor datasheet, except as a figure in the Turnable Loop...
  10. mamu

    Raptor Flip-Top VV Mod with 20A, 120W dc/dc converter...

    If you are referring to using an on/off/on switch as a master kill switch, it would need to be rated to carry a high amp load.
  11. mamu

    Tinkering with the OKL2-T20 20A 110W dc/dc converter...

    I am not steeljan lol
  12. mamu

    PTH08T221W - 16A 88W w/ UVLO...

    Update: a work around for not having to use an NC switch and instead use an NO switch has been tested and is working aok. Thanks so much to MJarvis for his help in locating the schematic that shows this - and of all things with an Evercool board. I should call this converter Evercool on...
  13. mamu

    PTH08T221W - 16A 88W w/ UVLO...

    Features: 16A, 88W Input: 4.5 - 14V Output: 0.69 - 5.5V Adjustable UVLO 2 versions - PTH08T220W and PTH08T221W. I chose to work with PTH08T221W (ceramic cap version). Datasheet here: PTH08T221W Tiny profile for a 16A module (23mm x 20mm x 9mm)... Size comparison with the OKR-T10...
  14. mamu

    Tinkering with the OKL2-T20 20A 110W dc/dc converter...

    I revised the OKL2-T20 wiring guide to more of a schematic type and already I get a request to bring the old one back lol. I don't like the huge Hammond cases, so I used my Sam case (2x C battery box - 83mm x 57mm x 30mm) and it's fully loaded with P-FET, fuses, low battery indicator, voltage...
  15. mamu

    Raptor Flip-Top VV Mod with 20A, 120W dc/dc converter...

    I just ordered a 16A 88W DC-DC Converter to tinker with. What drew my interest to it is that it has programmable UVLO - I can set low voltage cutoff to what I want with just a single resistor on the inhibit pin. The converter has a nice low profile and size for being a high amp converter...
  16. mamu

    Raptor Flip-Top VV Mod with 20A, 120W dc/dc converter...

    What would be way cool would be to figure how the Raptor sets the UVLO at 4.2v and change that to 6.2v or so with a few resistors or what nots. I have no idea if that is even doable, but without a Raptor schematic I wouldn't know where to begin.
  17. mamu

    Raptor Flip-Top VV Mod with 20A, 120W dc/dc converter...

    I think so too. I love love what the high drain lipos do for us vs cylindrical. And lipos have much much lower internal resistance than cylindrical, so that helps with longer vape times too.
  18. mamu

    Raptor Flip-Top VV Mod with 20A, 120W dc/dc converter...

    I hear ya. I was really disappointed that the supervisory IC at the cutoff voltage we need is only available in an ant size package and needs a proper PCB to mount on, so I kinda put off searching other ways. I haven't given up though. I want to do a lipo pack mod with the Raptor like you...
  19. mamu

    Raptor Flip-Top VV Mod with 20A, 120W dc/dc converter...

    You don't need a 20A switch. We were talking about this at breaktru's and David4500 suggested parallel wiring a DPST or DPDT switch. This would double the current rating and lower resistance of the switch. Gotta love this paralleling stuff. :laugh: Plus, as breaktru had said, we're not...
  20. mamu

    Raptor Flip-Top VV Mod with 20A, 120W dc/dc converter...

    I'm not sure why a MOSFET with the base driven by a voltage divider, including a zener diode, wouldn't work, but on thinking about it you may not get a sharp cutoff and have too much power dissipation from the MOSFET. A comparator though would provide a sharp cutoff for the MOSFET.
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