mosfet mod for the ZZ monster truck!

This topic has 8 replies, 6 voices, and was last updated 19 years, 5 months ago by TallduDe.

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- November 16, 2004 at 7:32 pm #10367
  ph2t
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  Posts: 2088
  These trucks are nuts! a rare 1/64 purchase for me these days.
  
  Here’s what I’m doing currenty. It’s by no means finished, but hell they are fun!
  
  Looking at the top of the pcb, I removed the following. The red are the D9D driver trannies, the yellow are the S1A trannies. All four are removed.
  
  On the underside I also removed the S2A pnp trannies…
  
  Here’s what i then do to the top portion of the PCB.
  
  1) Remove all 4 marked trannies.
  2) Solder two irlml2502 mosfets in place of the original S1A’s, pin for pin mapping.
  3) Run a wire from the Base pad to the Gate pad for each direction.
  4) Run a wire from the Gate pad of each new mosfet to the bottom side of the PCB. They will be jumpered to the “flipped” mosfets on the other side. Still working on the pics for that.
  
  I soldered the two fly leads to the flipped nchan’s on the other side of the pcb, bridged the blue wires, she runs! yeah!
  
  I get 4.87V for the fwd mosfet drive, that’s great! Rev is less though, 4.66V. Might explain why (when stock) rev is a little less punchy than fwd. This excellent fact of a high voltage drive (>4V) means a lot when it comes to turning on mosfets, trying hard not to bar up over this, lol…..
  
  video soon! the monster truck will be going under some LiPOsuction first, :smiley2:…..
  
  ph2t.
- November 16, 2004 at 7:42 pm #24979
  TallduDe
  Participant
  Posts: 1430
  nicccccceeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee.
  
  to anyone who hasnt got a monster get one! no two!
  
  they are really worth it. and if ph2T can make em go mach speed (scale of cource) they can be hellar cool.
  
  btw try to get some music for this vid of urs LOL. :p
- November 17, 2004 at 1:43 am #24973
  betty.k
  Participant
  Posts: 2487
  zz monsters ROCK HARD!!!!!!!!!:p:8ball:
- November 18, 2004 at 12:25 am #24870
  micro_Amps
  Participant
  Posts: 1290
  Nice work Ph2t.
- November 18, 2004 at 10:15 pm #24856
  TallduDe
  Participant
  Posts: 1430
  so who else owns one of these things?
- November 21, 2004 at 11:00 pm #24778
  Impreza
  Participant
  Posts: 1124
  Nice work as always ph2t. I have been jumping mine (stock) of my coffee table (2ft high) on to the carpet. It rolls and lands on its wheels 70% of the time:)
- November 25, 2004 at 8:19 pm #24534
  biohazard
  Participant
  Posts: 23
  Great job on the tutorial ph2t, Just got done with mine and using the 21,000-RPM motor it will pull a wheelie off the start.
- November 25, 2004 at 9:00 pm #24533
  ph2t
  Participant
  Posts: 2088
  so you got it working without any problems dude? great to hear!
  
  spread the knowledge I say!
  
  ph2t.
- November 26, 2004 at 6:39 pm #24512
  biohazard
  Participant
  Posts: 23
  I think I am going to make a mini monster truck track layout. I have already made a micro 1/64 scale sled just have to modify the zz truck for the hook-up
  here is a link to the sled picture http://www.rcmod.com/cmalbum/thumbnails.php?album=101
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