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#1
02-20-2007, 11:14 PM
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FET explaination
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. 
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#2
02-20-2007, 11:18 PM
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that helps out alot tho!
__________________
project drift-mustang 80% done project crawler-hummer 75% done all i need now is $ 
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#3
02-20-2007, 11:19 PM
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Very good explanation! That clears up many things for me!
__________________
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#4
02-20-2007, 11:21 PM
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correct me if im wrong but is a fet sort of like a anti resistor (opposite of a resistor) this is just me seeking more intellectual understanding not saying thats what it is just inquiring...
good job on the fet explanation!
__________________
+{[<Go fast or go home>]}+ Scion Tc-stock 06 Mustang- Awd Hummer- Awd
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#5
02-20-2007, 11:24 PM
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#6
02-20-2007, 11:27 PM
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good stuff... i was just wondering... i guess i dont get the whole fet concept...
__________________
+{[<Go fast or go home>]}+ Scion Tc-stock 06 Mustang- Awd Hummer- Awd
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#7
02-20-2007, 11:30 PM
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#8
02-20-2007, 11:32 PM
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no i understand what they do...just not why they are there...
__________________
+{[<Go fast or go home>]}+ Scion Tc-stock 06 Mustang- Awd Hummer- Awd
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#9
02-20-2007, 11:37 PM
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They are there for speed control, without them (using old school technology) the size of an xmod would be impossible. An old 3 step servo controlled speed controller would take up nearly half of an xmod by itself.
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#10
02-20-2007, 11:40 PM
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yeah don't worry about it im one of those people who like to have a complete understanding of things... i like to know things its weird... thanks for helping though...
__________________
+{[<Go fast or go home>]}+ Scion Tc-stock 06 Mustang- Awd Hummer- Awd
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#12
02-21-2007, 09:44 PM
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#13
02-21-2007, 10:05 PM
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when i upgraded i reused to stock fets and stacked them on another vehicle with great performance changes.
__________________
http://forum.psfights.com/index.php
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#15
02-22-2007, 09:51 PM
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97Supra? Are you on other forums?
FET's have limit current on some board. For example, the Micro-T. No matter how much current you feed the board, the motor still only gets 2.9v... I'll talk to ph2t about more on this, but I recall him saying this about the Xmods and Mini-Z boards as well...
__________________
After a thousand years of oppression,
Let the berserks rise again, Let the world hear these words once more: "Save us, oh lord, from the wrath of the Norsemen"
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#16
02-22-2007, 09:57 PM
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#17
02-22-2007, 10:21 PM
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Er. Sorry. It's hard to explain, but the FET's on some cars limit the amount of VOLTAGE the motor recieves, meaning no matter how many batteries you get, it will still run the same, maybe just cooler... Not sure of this on the xmods, but I'll get back to it..
__________________
After a thousand years of oppression,
Let the berserks rise again, Let the world hear these words once more: "Save us, oh lord, from the wrath of the Norsemen"
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#18
02-22-2007, 10:25 PM
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#19
02-25-2007, 08:26 PM
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Not sure if this is off topic, if so sorry, but does it matter when stacking fets if its an evo or a gen1 cuz i want to stack fets on my mustang evo
__________________
My Real Cars Pt Crusier  gets me from A to Ba broken 95 nissan alt  My Xmods... 06 Mustang (awd, bearing, stage 2) Titan (awd)
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#20
02-26-2007, 07:42 PM
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I'm a total newb to all this stuff, and electronics in general. Is there any way that you could post a pic of what FETS are, or something?
__________________
-Dan Real Cars 1994 Chevrolet B4C Camaro 2005 Subaru Impreza WRX STi XMods 1967 Chevrolet Camaro 2004 Subaru Impreza WRX STi
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