Project overkill

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    • August 12, 2003 at 1:07 pm #11798
      VR-4
      Participant
      • Posts: 400

      just finished my new z mods.

      i have a 6 cell mod and 36fet z “hulls”

      for the 6 cell i just put a 2 cell aaa holder on the top and mounted the 36 fets on the side of that. but you can only use the high bodys like skyline clk ect.

    • August 13, 2003 at 3:06 pm #46838
      jamiekulhanek
      Participant
      • Posts: 2563

      Rightio, i thought the PCB could only handle 5 volts, and what does ‘hulls’ mean?

    • August 13, 2003 at 3:14 pm #46839
      VR-4
      Participant
      • Posts: 400

      its fast and the pcb can handle 6volts max. ben driveing it with no probs

    • August 14, 2003 at 4:42 pm #46853
      jamiekulhanek
      Participant
      • Posts: 2563

      I think rather than using a stack of 20 FETs you should look at using a larger MOSFET…..

    • August 14, 2003 at 5:06 pm #46855
      VR-4
      Participant
      • Posts: 400

      more fets more speed goin for 5 fets now i just ned some more money 🙁

    • August 15, 2003 at 5:42 pm #46865
      PandaBear
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      • Posts: 1866
      Quote:
      I think rather than using a stack of 20 FETs you should look at using a larger MOSFET…..

      In theory yes, but in practical life its hard to find suitable
      MOSFETs with the same/suitable drive & input specifications.
      They just aren’t simple signal transistors…

      So stacking FETs is easier, as parallel FETs gives lower resistance.
      But 20… erm, ya better cut some sunroofs in ya mZ shell baby. :p

    • August 15, 2003 at 6:19 pm #46867
      jamiekulhanek
      Participant
      • Posts: 2563

      I am sure there is one that is suitable for the job out there somewhere.

      I’ve done a 6×2 FET stack in my car, haven’t tested it yet…..but it does work.

    • August 15, 2003 at 6:34 pm #46871
      PandaBear
      Participant
      • Posts: 1866

      That IRF7389 is already a “compatible” chip… :smiley2:

    • August 15, 2003 at 6:56 pm #46873
      jamiekulhanek
      Participant
      • Posts: 2563

      BUT…….its still a crappy lil’ surface mount chip….im talking about a larger mosfet with a heatsink etc. That can handle alot of power.

    • August 15, 2003 at 6:58 pm #46874
      jamiekulhanek
      Participant
      • Posts: 2563

      Wills, check your PM’s……..

    • August 16, 2003 at 6:42 am #46883
      VR-4
      Participant
      • Posts: 400

      i can fit 20 inder the cover you just gotta sidestack after you run outta room

    • August 16, 2003 at 9:23 pm #46887
      trash
      Participant
      • Posts: 651

      I’m just going to get a thyrotron to replace my fets …. dump 20MJ straight into the motor.
      The explosion will propell the car forward !
      2 class A rocket motors for JATOs mounted on the sides. MiniZ drag cars … YEAH !!!!
      0 to 800kmph in 3 seconds !!!

      If you’re seriously uping you voltage to the motors but still want 6 volts for your controller,
      use a LM7806 voltage regulator.
      I haven’t put much thought into the motor circuit yet myself, but looking for batteries that have an internal impedence close to that of
      the motor might be an idea. The are some nice
      low impedence cordless phone batteries. 4.5V from
      memory. 2 of these for 9 volts, you just have to make some space.

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