Go Back   XmodSource.com > Xmods > XMOD Electronics
Register FAQ Members List Calendar Gallery iTrader Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Display Modes
  #21  
Old 07-26-2007, 12:52 PM
garder121's Avatar
garder121 garder121 is offline
Life is like a game
 
Join Date: May 2007
Location: brooklyn ny
Posts: 288
Trader Rating: (0)
Default

no matter wat any1 tells me about fets i still won't comprehend it i know its for the current flow but i don't understand the point of stackin them and flat4 racin has a point can some1 show a pic of all this
__________________

Quote:
Originally Posted by garder121 View Post
not so secret anymore but this is so sexy i'm gonna mix spanish and english together muy=very + sexy=sexy = smexy *very sexy* but i love the version more than the stock it just looks so nice idk how to explain myself.
Reply With Quote
  #22  
Old 07-27-2007, 12:30 AM
bondo's Avatar
bondo bondo is offline
All 6's and 7's
 
Join Date: Oct 2006
Location: charleston south carolina
Posts: 1,427
Trader Rating: (8)
Send a message via MSN to bondo
Default

Quote:
Originally Posted by garder121 View Post
no matter wat any1 tells me about fets i still won't comprehend it i know its for the current flow but i don't understand the point of stackin them and flat4 racin has a point can some1 show a pic of all this
all of the info you need is at your fingertips.
if your not willing to look and learn then there isnt much point is there?

your here so you obviously have the internet and access to every bit of info that every modder that came before you has/had.

personally i though Bart explained it rather well.
__________________
Time you enjoy wasting is not wasted time....
Reply With Quote
  #23  
Old 07-27-2007, 02:07 AM
BART's Avatar
BART BART is offline
XMS Administrator
 
Join Date: Dec 2006
Location: Ohio
Posts: 2,621
Trader Rating: (5)
Default

Thanks Bondo...I tried but I guess you cant reach everyone.
Reply With Quote
  #24  
Old 01-23-2008, 08:12 PM
kenney's Avatar
kenney kenney is offline
Elite member
 
Join Date: Mar 2006
Posts: 309
Trader Rating: (0)
Default fet

Do you or anyone have or know the fet's electrical schmatic?


Quote:
Originally Posted by ZX9RBART View Post
There seem to be so many questions about fets that i thought i would explain what they are and what they do. I'll try to make it make sense...let me know if it needs more.

Not copied or pasted, these are my words. Fets, or field effect transistors control the power that is put out to your motor. You can search for pics but they are easy to pick out...they are small black squares with 3 shiny terminal coming off of them soldered to the board, there are 2 of them. They are gated and pretty much controlled by a square wave (-_-_-_-_-_-) when turned on they allow current to flow and when turned off they stop said current. The frequency or amount of time they are on compared to off determines how much current is fed to the motor. The power that goes to the motor is therefore actually pulsed but at such a great speed that it becomes seamless. A stock fet can only handle so much current so stacking doubles the available current (does not however double speed). The same goes for larger or upgraded fets. This is a pretty general and low tech explanation but I feel it should answer most questions about fets and stop the endless questions about them.
Reply With Quote
  #25  
Old 01-23-2008, 09:56 PM
BART's Avatar
BART BART is offline
XMS Administrator
 
Join Date: Dec 2006
Location: Ohio
Posts: 2,621
Trader Rating: (5)
Default

I'm sure donzi can dig something up to copy and paste for you, If not just pm her and ask her to post it here for all to see.
Reply With Quote
  #26  
Old 01-24-2008, 12:49 AM
Mooshu_Beef's Avatar
Mooshu_Beef Mooshu_Beef is offline
Stage 1 member
 
Join Date: Jan 2008
Posts: 59
Trader Rating: (0)
Default

If you don't get his explanation, think of it like this:

Think of the electricity water. FETs are like the dam that regulates the flow of the water. Stacking FETs opens up more gates, and allows the water to flow more freely. Some motors work so hard that they need the flow to be strong to make it work.

If you have a really high metabolism but you can't eat very quickly, you're going to die pretty much. A high amp draw motor will demand a lot of amps, but the FETs won't allow that much because it only allows a certain amount of amps.

Yeah I am really tired, so that probably doesn't make sense
__________________
I am a man of few words.
Reply With Quote
  #27  
Old 01-24-2008, 12:57 AM
texan_idiot25's Avatar
texan_idiot25 texan_idiot25 is offline
Yes, 1945 Cadillac Tank
 
Join Date: Jun 2006
Location: Austin, TX
Posts: 3,366
Trader Rating: (5)
Send a message via AIM to texan_idiot25
Default

Thats actually how most my electronics was taught to me, think of it as water

That's how I've tried explaining it too.
__________________
You know what I'm gonna do? I'm gonna get myself a 1967 Cadillac Eldorado convertible, hot pink, with whale
skin hubcaps and all leather cow interior and big brown baby seal eyes for headlights. Yeah! And I'm gonna drive
around in that baby at 115 miles an hour, getting 1 mile per gallon.

I may be king of the idiots, but my kingdom is vast and my subjects are everywhere
Reply With Quote
  #28  
Old 07-06-2008, 05:45 PM
amorton94's Avatar
amorton94 amorton94 is offline
RC CRAWLING ADDICT!
 
Join Date: Jul 2008
Posts: 625
Trader Rating: (2)
Send a message via MSN to amorton94 Send a message via Skype™ to amorton94
Default

Quote:
Originally Posted by ZX9RBART View Post
true...that is the whole purpose of stacking them...to allow more current flow (torque)
how do you stack them?
__________________
IN NEED OF MONEY FOR MRC!!!!
Reply With Quote
  #29  
Old 07-09-2008, 02:25 PM
Mooshu_Beef's Avatar
Mooshu_Beef Mooshu_Beef is offline
Stage 1 member
 
Join Date: Jan 2008
Posts: 59
Trader Rating: (0)
Default

if you're asking how to stack them, you might have some trouble replacing/putting FETs in anyways.

Atomic mods has a tutorial here:

http://www.atomicmods.com/Categories...tallation.aspx
__________________
I am a man of few words.
Reply With Quote
  #30  
Old 12-06-2008, 11:04 AM
Doc Moddin''s Avatar
Doc Moddin' Doc Moddin' is offline
Stage 1 member
 
Join Date: Dec 2008
Location: Somewhere, NY
Posts: 30
Trader Rating: (0)
Default

Sorry, couldn't help notice the "Dueling Banjos" of Sweed and ZX9RBART.

I admire Librarian for wanting to know more about electronics...even though (he admits) it may not expand his ability to improve his XMOD. Never stop asking questions, man!

What ZX9RBART was trying to explain is the difference between amperage and voltage:

Imagine standing on a cliff with a boulder. Voltage is like a way of measuring how high the cliff is. The higher the cliff, the more energy a falling boulder will have. The height of the cliff is the voltage.

Amperage is a related concept. Amperage is the amount of force that the boulder strikes the ground with. Amperage is affected by voltage (how high up you drop the boulder) but is also affected by other factors:

1. the weight of the boulder. Obviously dropping a 1lb. rock won't hit the ground as hard as a 50lb. boulder. This is because force=mass times acceleration. Increasing the mass, increases the force.

2. Wind resistance. Obviously, if you attached a parachute to the boulder, it wouldh't strike the ground with as much force as if it were in true free-fall. This is related to Resistance. In electronic-ese, the better your wires (conductors) the less resistance--i.e., more current reaches the motor with copper wires than with, say aluminum wires. An FET works on this principle--it is a programmable road block to current--from the batteries to the motor. Like ZX9RBART (come on, get an easier to remember screen name! eheheh) said, the FET mod is like getting a bigger spiggot to allow more current to flow.

So for Sweed, it's true, a FET doesn't change how high the cliff is, it reduces wind resistance as the boulder falls (i.e., the boulder is more "aerodynamic").

The reason there is an FET at all on the cars is because it regulates the amount of current per unit time that reaches the motor. Anyone who has overheated a motor understands the usefulness of an FET. The trick is to maximize the amount of current reaching the motor without overheating it.

The manufacturers have "FETed" the cars with a large margin of error so that the motors don't overheat. What the modders have done is basically say, "Yeah, yeah...I know, I don't want to overheat the motor but I think I can put a little more juice through the motor and still not burn it up."

I'm sure I made an error or two in my explanations. Anyone who wants to polish my analogies is welcome to do it. If I left anything out, please feel free.

Hang loose,

--Doc
Reply With Quote
  #31  
Old 01-18-2009, 12:54 PM
TripleXmodder(akaXXX)'s Avatar
TripleXmodder(akaXXX) TripleXmodder(akaXXX) is offline
Working Class Hero
 
Join Date: Oct 2008
Location: Here and There... Cali right now
Posts: 1,251
Trader Rating: (32)
Send a message via MSN to TripleXmodder(akaXXX)
Default

Good information. Try WIKIPEDIA when your not sure what somthing is. Here is WIK for FETS.

http://en.wikipedia.org/wiki/Field_effect_transistors
__________________

XXX FREE modding Service: http://www.xmodsource.com/forum/showthread.php?t=17800
PM me for a quote or any questions. HAPPY MODDING

100% Positive Itrader feedback http://www.xmodsource.com/forum/itrader.php?u=6901
Reply With Quote
  #32  
Old 01-18-2009, 01:28 PM
Donziikid's Avatar
Donziikid Donziikid is offline
XMS Administrator
 
Join Date: Apr 2007
Location: West Branch, MI
Posts: 3,564
Trader Rating: (5)
Send a message via AIM to Donziikid
Default

Quote:
Originally Posted by TripleXmodder(akaXXX) View Post
Good information. Try WIKIPEDIA when your not sure what somthing is. Here is WIK for FETS.

http://en.wikipedia.org/wiki/Field_effect_transistors
Yes, use Wiki, because everyone is going to understand what the following means:
Quote:
Originally Posted by wiki
The field-effect transistor (FET) is a type of transistor that relies on an electric field to control the shape and hence the conductivity of a 'channel' of one type of charge carrier in a semiconductor material.
And the above does what for an Xmod...?

This thread was meant to put it into simple terms for people to understand what an FET has to do with Xmodding, not what its actual meaning is.
__________________
XMS Rules & Guidelines | B/S/T Rules | How To Post Pictures

Greyscale Racing Member

The Collection:
Mitsubishi Pajero | AE RC18MT
TLMicroCrawler | Xmod ShowRoom | 'Yota XTruck
"The fun begins when the pavement ends."

Reply With Quote
  #33  
Old 01-18-2009, 01:50 PM
TripleXmodder(akaXXX)'s Avatar
TripleXmodder(akaXXX) TripleXmodder(akaXXX) is offline
Working Class Hero
 
Join Date: Oct 2008
Location: Here and There... Cali right now
Posts: 1,251
Trader Rating: (32)
Send a message via MSN to TripleXmodder(akaXXX)
Default

Quote:
Originally Posted by Donziikid View Post
Yes, use Wiki, because everyone is going to understand what the following means:


And the above does what for an Xmod...?

This thread was meant to put it into simple terms for people to understand what an FET has to do with Xmodding, not what its actual meaning is.

Sorry, Take the simple expllanation and read up up the technical stuff. That's how we use are brains and learn stuff. I didn't mean anything by that, just throwing in some references.
__________________

XXX FREE modding Service: http://www.xmodsource.com/forum/showthread.php?t=17800
PM me for a quote or any questions. HAPPY MODDING

100% Positive Itrader feedback http://www.xmodsource.com/forum/itrader.php?u=6901
Reply With Quote
  #34  
Old 01-18-2009, 05:35 PM
Doc Moddin''s Avatar
Doc Moddin' Doc Moddin' is offline
Stage 1 member
 
Join Date: Dec 2008
Location: Somewhere, NY
Posts: 30
Trader Rating: (0)
Default

I understand what XXX was talking about.

We must learn to stand and walk before we can run (with any degree of success).

I think XXX was just saying that now the basics have been laid down in this thread, the Wiki reference is a good place to EXPAND ones knowledge. And if there are any difficult terms in Wiki's entry...that's what google is for...to help find word definitions.

I wonder if any of the flames targeted at XXX come from the mentality that it is always better to take a class on something/go to college to learn something than to try and self-educate.

I am reminded of the bar scene in "Good Will Hunting" where Matt Damon disses a pseudo-intellectual History Major--made me want to stand up and cheer.

The study of any subject begins by learning the subject's language...its jargon. If understanding of concepts can't be achieved on one's own, that is what these forums are for.

p.s. If you click on XXX's link and scroll down to the FET operation segment, it explains in more detail ZX9RBART's description of "wave shape"...to give an idea of how the current is modified by the transistor.
__________________
"Well, it's a bit like being drunk."
"What's wrong with being drunk?"
"Go ask a glass of water."

Last edited by Doc Moddin'; 01-18-2009 at 05:51 PM..
Reply With Quote
  #35  
Old 01-18-2009, 07:00 PM
BART's Avatar
BART BART is offline
XMS Administrator
 
Join Date: Dec 2006
Location: Ohio
Posts: 2,621
Trader Rating: (5)
Default

Wow, just realized it's been 2 years since I wrote that. I dont really care whats posted as long as someone gets something out of it. I wrote that as simple as I could as I usually go wildly too deep when explaining things and just confuse people (electronics are a passion of mine as well as a career). This thread has seemed to gain some popularity lately and I will probably clean it up here soon so that the info and answers are easier to locate without wading through pages of posts.
Reply With Quote
  #36  
Old 01-18-2009, 07:20 PM
TripleXmodder(akaXXX)'s Avatar
TripleXmodder(akaXXX) TripleXmodder(akaXXX) is offline
Working Class Hero
 
Join Date: Oct 2008
Location: Here and There... Cali right now
Posts: 1,251
Trader Rating: (32)
Send a message via MSN to TripleXmodder(akaXXX)
Default

Yeah I didn't mean anything by that, I was just posting more info. I even started the post with "good information" (directed to ZX9RBART for the thread)
__________________

XXX FREE modding Service: http://www.xmodsource.com/forum/showthread.php?t=17800
PM me for a quote or any questions. HAPPY MODDING

100% Positive Itrader feedback http://www.xmodsource.com/forum/itrader.php?u=6901
Reply With Quote
  #37  
Old 01-23-2009, 11:54 AM
Doc Moddin''s Avatar
Doc Moddin' Doc Moddin' is offline
Stage 1 member
 
Join Date: Dec 2008
Location: Somewhere, NY
Posts: 30
Trader Rating: (0)
Default

This thread got me thinking some more. Here are some abbreviations and simple formulas to demonstrate the relationship between the different values.

I = Current. Measured in Ampheres or, "Amps"

V = Voltage. Measured in Volts.

R = Resistance. Measured in Ohms.

P = Power. Measured in Watts

V = I x R

P = (I)2 x R

Sorry, that "2" is supposed to be an exponent. I - squared. My old computer used to allow me to make superscripts for exponents.

To simplify, P = I x V

Here's a cool link for a voltage-drop calculator:

http://http://www.electronicsteacher.com/electronics-calculator/voltage-drop-calculator.php

Hope that wasn't confusing. I also hope it explains how an FET modifies current, without changing voltage.

--Doc
__________________
"Well, it's a bit like being drunk."
"What's wrong with being drunk?"
"Go ask a glass of water."
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

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


All times are GMT -4. The time now is 02:42 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.