Mini-Z, Kyosho Mini-Z Racer, MR-03, MR-02, MA-010, Forums, News, Pictures, Parts, and Shop - Mini-ZRacer.com
Forums, Mini-Z, MiniZ, Kyosho Mini-Z, Kyosho MiniZ, Kyosho Mini-Z Racer
Mini-Z Hop-Ups, Mini-Z Parts, MiniZ Hop-Ups, MiniZ Parts, Kyosho Mini-Z Hop-Ups, Kyosho Mini-Z Parts, Kyosho MiniZ Hop-Ups, Kyosho MiniZ Parts, Kyosho Mini-Z Racer Hop-Ups, Racer Kyosho Mini-Z Parts
Old 2017.01.23, 06:27 PM   #1
jdmgoodies
Registered User
 
Join Date: Dec 2012
Posts: 56
help with fets

can someone post links so i can read up on fets? mainly what fets do. why they are stacked in mini-z's the different types. chooseing the right ones and possibly the drawbacks of stacking fets. oh and can fets be stacked on a brushless system? my main reason for learning about fets is that i have a mb-010 and i think with the 32t pn motor im about to fry the fets and if on my brushless mb-010 if it can handle the atomic 12000kv motor or if i need to ad fets. thanks all
jdmgoodies is offline   Reply With Quote
Old 2017.01.23, 06:38 PM   #2
Traveler
of both Time and Space
 
Traveler's Avatar
 
Join Date: Apr 2008
Location: Winston-Salem, NC
Posts: 1,892
I can tell you there is lots of good info on the forums here about FETs. Just use the search feature.
Traveler is offline   Reply With Quote
Old 2017.01.23, 07:10 PM   #3
EMU
EMUracing
 
EMU's Avatar
 
Join Date: Oct 2004
Location: NYC
Posts: 7,417
Send a message via AIM to EMU
Can't speak for the brushless, but with a 32t on a buggy, you should definitely have stacked fets. The buggy puts more load on the motor load due to the extra weight, which I turn will draw more amperage through the fets.

To put it in basic terms... Stacking fets spreads the load through the fet. So the more fets in parallel (how they are stacked), the less load each one handles.

if you want a more in depth definition, use that search button. This topic has been explained repeatedly by more knowledgeable people than I.

http://mini-z-guide.com/mosfet.htm
__________________
EMUracing
Micro RC Syndicate /DG Designs /GSR /Reflex Racing /Fast By Faqish /MurderTown Racing

Last edited by EMU; 2017.01.23 at 07:31 PM.
EMU is offline   Reply With Quote
Old 2017.01.23, 08:49 PM   #4
jdmgoodies
Registered User
 
Join Date: Dec 2012
Posts: 56
thanks for the info guys ill try reading a bit and using the search
jdmgoodies is offline   Reply With Quote
Old 2017.01.25, 06:16 PM   #5
Minizorro
Registered User
 
Join Date: Aug 2015
Posts: 80
There's tons of info about fets for pre-mr03 boards.
That's when - from what I understand- installing fets did really matter.
MR03 boards can handle hotter motors but I support jdm when he's asking about brushless, I have no clue and would like to know. Is stacking fets on brushless helpful- in thinking buggy or ma020 cars.
Since I did stack a layer of fets just to try and found no difference whatsoever on a ma02 brushless... was I supposed to stack a layer onto the fets that are on the bottom side of the board as well?? I sort of guessed the fets on the underside were for reverse so I didn't bother but that might have been a mistake!
Minizorro is offline   Reply With Quote
Old 2017.01.25, 07:25 PM   #6
EMU
EMUracing
 
EMU's Avatar
 
Join Date: Oct 2004
Location: NYC
Posts: 7,417
Send a message via AIM to EMU
Electrically, the bottom fets are stacked with the top ones. They connect to the same traces, but are on the opposite side of the board. Adding one layer to the top essentially gives you a triple stack fets. Adding another layer to the bottom will give you a quad.

Being on opposite sides of the pcb, a stock asf/ad arrangement will offer better cooling to the fet than a single sided pcb with a dual stack. It also offers a marginal decrease in resistance due to the additional fet legs contacting the pads/trace rather than all current going through one fets legs to the pads.
__________________
EMUracing
Micro RC Syndicate /DG Designs /GSR /Reflex Racing /Fast By Faqish /MurderTown Racing

Last edited by EMU; 2017.01.25 at 07:28 PM.
EMU is offline   Reply With Quote
Old 2017.01.27, 01:40 PM   #7
Minizorro
Registered User
 
Join Date: Aug 2015
Posts: 80
Thanks for the very clear explaination!
Do you confirm that stacking fets on VE boards can be useful? As for me it made no difference. To be honest it was one of those impulse mods and i consider myself lucky I didn't ruin the board as I have no much experience in soldering!
Minizorro is offline   Reply With Quote
Old 2017.01.27, 02:40 PM   #8
EMU
EMUracing
 
EMU's Avatar
 
Join Date: Oct 2004
Location: NYC
Posts: 7,417
Send a message via AIM to EMU
I have little to no experience with brushless technology, so I cannot be of help there.
__________________
EMUracing
Micro RC Syndicate /DG Designs /GSR /Reflex Racing /Fast By Faqish /MurderTown Racing
EMU is offline   Reply With Quote
Old 2017.01.27, 05:40 PM   #9
Jshwaa
Registered User
 
Jshwaa's Avatar
 
Join Date: Dec 2014
Posts: 215
Quote:
Do you confirm that stacking fets on VE boards can be useful? As for me it made no difference. To be honest it was one of those impulse mods and i consider myself lucky I didn't ruin the board as I have no much experience in soldering!
Stacking probably won't do much for you with brushless. You may be able to get away with a heavier kv rated motor, but that won't change the switching speed of the inverter (controller). Stacking FET's was a big mod back in the older rev's of mini-z and when xmods were a thing. As previously mentioned, the MR-03's were impressive in how much current they could deliver. I didn't stack, but upgraded to heavier FET's and bonded a heat sink to them to draw out the heat. The benefits of stacking are limited. The circuit that turns them on and off can only provide the FET so much signal, and the more FET's you stack, the stronger the signal required to turn them all on and off.
__________________
Electrical Engineer
Mini-Z/RC Enthusiast
Jshwaa is offline   Reply With Quote
Old 2017.01.28, 04:04 AM   #10
Minizorro
Registered User
 
Join Date: Aug 2015
Posts: 80
Very useful information many thanks!
Minizorro is offline   Reply With Quote
Old 2017.03.26, 08:37 PM   #11
byteme909
Registered User
 
Join Date: Aug 2005
Posts: 64
looking for some info as well and didn't want to start a new thread. I have some stock ASF MR03 boards (RA22B w/tiki mode) and I wanted to put in a hotter motor than the X-Speed from Kyosho. Tried locating some R246 motors for NiMH to no avail. I think I saw some PN Racing S03 in stock but that is 39T motor. Do I need to have the boards FET modded to accept the motor? I saw some threads saying yes and then some websites saying the MR03 ASF boards can accept pretty much any motor.
byteme909 is offline   Reply With Quote
Old 2017.03.27, 07:09 AM   #12
Traveler
of both Time and Space
 
Traveler's Avatar
 
Join Date: Apr 2008
Location: Winston-Salem, NC
Posts: 1,892
Quote:
Originally Posted by byteme909 View Post
Do I need to have the boards FET modded to accept the motor? I saw some threads saying yes and then some websites saying the MR03 ASF boards can accept pretty much any motor.
No! I've run the PN 32T on stock ASF MR-03 board with no issues, so you can run a 39T on stock ASF MR-03 board, but the S03 is a really old PN motor. I would recommend one of the newer ones. The PN 43T and 39T are good, depending on what you are looking for. I like the 35T too!
Traveler is offline   Reply With Quote
Old 2017.03.27, 11:31 AM   #13
byteme909
Registered User
 
Join Date: Aug 2005
Posts: 64
thank you for the response. if we can go down to a PN 32T on the stock board then I guess we can fit an atomic chili motor at 35T?

my objective was to fit my MR03 cars with something faster than the x speed motor but has to be ball raced and no mods to the FETS.

I also want something for a MR015 ASF I just purchased. I think its the RA18 board? Does the RA18 board need FET job to accept motors as well?
byteme909 is offline   Reply With Quote
Old 2017.03.27, 12:15 PM   #14
Traveler
of both Time and Space
 
Traveler's Avatar
 
Join Date: Apr 2008
Location: Winston-Salem, NC
Posts: 1,892
The Atomic Chili is one of my favorite motors out there for a large track and runs fine on stock ASF MR-03 board. If the F1 board has 2 pairs of FETs like the ASF 03 board, it should be fine. A 52T down to a 43T would be good for the F1 car.
Traveler is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
where to find Steering FETs....? danieluki Parts and Hop-ups 4 2008.05.20 04:50 PM
Vishay Si4501 fets 3x2, works great.. CrashTestJohnny Parts and Hop-ups 1 2007.01.29 06:28 AM
Using Certain Hotter Motors on Stock FETs cbkia Mini-Z Science 0 2005.10.09 11:10 AM
one more question about FETs minizmaniac Motor Tech 4 2003.04.22 09:57 PM


All times are GMT -5. The time now is 11:25 AM.


Powered by vBulletin® Version 3.8.3
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2011 Mini-ZRacer.com
Mini Inferno Sale - Up to $85 Instant Savings!
Micro-T Hop-Ups
RC18R, M18, Micro RS4, Mini-LST, TamTech-Gear, Minizilla, RC18T, RC18B, RC18MT
shop.tinyrc.com Products

more»
Tiny RC Community News
[03/22/17] MZR was on vacation, didn't... : All kidding aside, the host experienced a bit of a server meltdown last week and efforts to restore the site to a new server took longer than anticipated. The current server is temporary until - more»
[11/25/15] Did You Hear? Our Black... : Hey Racers,
We're getting started a bit early with our Black Friday sale this year.  Generally we're not supporters of retailers opening early on Thanksgiving, but in our case, we're - more»
[06/30/15] shop.tinyrc.com: Have You... : Hey All! Just a quick reminder to everyone that we post all of our shop.tinyrc.com Newletters here on the MZR Forum. If for some reason you miss them in your email inbox, you can always see the - more»
Mini-Z, Mini-Z Racer, MR-02, MA-010
M18, M18T, RC18T, Mini-LST, Mini-T, Micro RS4, XRay, 1/18, 18th scale
XMODS, XMOD, Micro Flight, ZipZaps, ZipZaps SE, Bit Char-G, MicroSizers, TTTT, Plantraco Desktop Rover, SuperSlicks, Digi Q
Mini Inferno, Mini Inferno ST, half EIGHT, 1/16, 16th scale
Epoch, Indoor Racer, 1/43, 43rd scale
E-Savage, eSavage, eZilla, e-Zilla, HPI
Robots, Bots, Bipeds, Wheeled, Manoi, Roomba, NXT, Lego, Hacking
Crawling, Crawlers, Micro, RC, Losi Mini-Rock Crawler, Duratrax Cliff Climber
Kyosho Minium, Caliber 120, Minium Forums
Mini-Z Hop-Ups, Mini-Z Parts, Mini Inferno Hop-Ups, Mini Inferno Parts, M18 Hop-Ups, M18 Parts