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  1. mamu

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

    Thanks for the heads up, branflan! I'm totally stashed with Raptors now. :laugh:
  2. mamu

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

    I should mention that idle current drain from the converter is off with the way the N-FET is wired, but the N-FET even when off will draw idle current. The idle current from the N-FET is the Zero Gate Voltage Drain Current (Idss). This idle current is usually 1 microAmp which is 0.001...
  3. mamu

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

    1. Yes, connect to Batt - else if you connect to Raptor GND you'll have to press the atty switch to read input volts. 2. Yes, P-FET Source connects to Vin, but zener connects to On/Off Control, Fire switch connects to Gate of N-FET. 3. Master is not required. 4. Yes, connect all converter...
  4. mamu

    OKR-T10 passthru w/ volt-ohm meter...

    I don't have a topic on the OKR-T10 here except for my passthru mod. You can join us on our FB buck regulator builds - I have all my latest wiring guides there ( Buck regulator builds ) and also at my forum ( Login ).
  5. mamu

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

    I'm sorry, BJ - I missed this post. No, I nixed the Raptor and the OKL2 for my passthru mod and used an OKR-T10. The enclosure I wanted to use was too small to fit the Raptor and OKL2 boards.
  6. mamu

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

    I've been working on the LVC (low volt cutoff) circuit for the OKL2-T20 off and on these last couple of weeks and finally got my ducks in a row with it. I was getting forgetful of paying attention to the low volt LED indicator I had installed with my OKL2 mod and thought I ought to get this...
  7. mamu

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

    lol I'd say they are more expensive and the continuous drain current is way overkill for our needs, but no harm in that though. All the other specs look great. I had emailed Vishay a few weeks back when I was thinking of making a lipo mod with one of these buck converters and didn't want to...
  8. mamu

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

    I see now. You tied Vin plus on/off control plus zener together on one side of the switch and gate on the other side of the switch, correct? So the 47K at the gate doesn't affect the zener then. Cool! Way cool that the zener cutoff voltage is working. How was it working with the small...
  9. mamu

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

    Can you show a sketch how you wired it and also what N-FET you are using, BJ? Are you using the 47K pull-down on gate and also the 7.5K on on/off control? Where exactly did you tie in the zener and what is the voltage across the zener? My wiring is based off how we wired the Fistpack way...
  10. mamu

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

    I'm working on a low volt cutoff for this converter and am testing it now. If it's good to go, I'll post the diagram. Welcome, AfterI. There is possibility for USB charging, but it is complicated and complex to wire it. It's not something I have attempted. Welcome, Visus. lol me too I...
  11. mamu

    OKL2-T20 Box Mod

    Parts look correct. As mentioned, you will need 18awg or 20awg wire for input and output (carries current - Vin, Vout, GND). 24awg is only for low load wiring.
  12. mamu

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

    Ok guys - help me out here. Will this work? Comments/feedback? Negative batt is isolated from the converter and 510 ground until both the kill switch and fire switch are on. Turn on the master switch, press the fire switch and good to go. Master off = no power, no current drain, or output...
  13. mamu

    External fuse for both overcurrent and reverse polarity protection with the DNA...

    The FET you linked should be doable for the DNA30 for reverse polarity protection. You would wire it the same as I wired the Si4477. For fuses, I like Littelfuse LoRho for smt type and for leaded fuses I like the RGEF series that TE Connectivity makes and the 16R series that Littelfuse...
  14. mamu

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

    I never thought anyone would actually run Raptor at 20A, but I guess they are. I updated the wiring guide for 2x 10A fuses then so no inadvertent trip issues if running at 20A. @ LowOhms - I had been using a Weller 30W for these last years, but recently bought a soldering station with a hot...
  15. mamu

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

    This has become a bit frustrating for me. I was asked to do a schematic version of the wiring for this converter. I thought well ok I hadn't done that before but sounded like a good idea and I can take the time to do that if that's what people want, but I'm receiving more and more requests to...
  16. mamu

    About fuses and choosing the appropriate fuse for your mod

    @ EDog13 - the DNA30 has max input current 12A. If using 4x 18650 batts in parallel, you would use 1x 3A fuse per batt (12A / 4 batts = 3A). @ sphongled1990 - the SX350 has max input current of 12A (actually 12.5A, but close enough to round it down to 12A). For 2x 18650 batts in...
  17. mamu

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

    The P version was not available when I bought this converter. Digikey and mouser have both versions available now.
  18. mamu

    Infinity DNA30

    Cool idea, Stereo. The shape of this case is nice as it snugs into the hand.
  19. mamu

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

    Getting ready to put this converter in a mod. I chose a 6.4v low voltage cutoff (resistor sets unloaded cutoff). All the resistors, caps, and N-FET are tied to the board. Makes a nice small 1" x 1" package...
  20. mamu

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

    Three 221 versions are available - I ordered one of each from TI. Gotta love getting free samples. :laugh:
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