What are MOSFETS?

[bvsciguy]

I saw a vid of a MOSFET Bit had alot of torque and it also looked likfe it would be pretty fast. Is a MOSFET kindof like a brusless for Bits? I am completely in the dark please help.
Thanks

[crazydave]

MOSFETs perform the same function as transistors, but with 1/10th of the resistance. Which means more current flows, and less juice is burned off as heat.

The MOSFET mod requires that you replace the transistors on your PCB with MOSFETs , it's not an easy mod that I would reccomend to beginners, but it's probably the best mod you can do to improve the efficiency of your car.

[Namuna]

Couldn't have explained it better myself, especially since I never knew the specific definition either!

Thx CD

[FoeverClownin]

i also had the same question but wut i was going to do is just take of the chips and thats it i was not going to put new 1s i heard that that will fry my bord because to much amps ant volts are passing through

[crazydave]

The only "chip" on the board would be the IC (integrated circuit) underneath that black blob of epoxy, that is the "brain" of your car, remove that, and your cars dead beyond repair.

If your referring to the row of transistors, those are NPN switching/amplifying type transistors. They turn the signal on and off, remove them, and there's nothing to make your car go.

MOSFETs do not draw current, they just pass it. The motor draws draws the current, and the battery produces the current and voltage. The motor can not draw more voltage. The motor can not draw more current than the battery can produce.

Because the MOSFETS have a lower resistance, they will allow more current to flow, with less heat build up. Irrellevant on a tiny RC, but if you were to use larger batteries, and a larger slot car motor, so you you were drawing more current from a source with more current, then in that case the PCB with the MOSFETs would be more effecient, and less like to burn up.



Seriously, there is a wealth of electronic information on the internet, and your public library. I suggest you guys do some reading before you go poking around where you don't understand.

[SuperFly]

Ok, dad.

[ph2t]

One thing you will find using MOSFETs (which incidentaly stands for Metal Oxide Semiconductor - Field Effect Transistor) is that the car will actually run for a longer time 'cause now there is less energy being wasted by the fets than was previously used by the original transistors. More energy means a longer runtime. I'm sure Fly and CD have noticed this as well.


ph2t.

[crazydave]

Originally posted by SuperFly
Ok, dad.

Lol

Well I didn't mean to come off like that, but I get a little bothered by reports of dead cars, and I'm just trying to help some people before they kill their cars.

...and yeah I noticed the longer runtime. At first I was surprised by this, but then remembered that that's the way it was with my 1/10 scale cars because there is less resistance, so I should have been expecting it, duh.

[SuperFly]

Hehe, I was just joking ya, Dave. But you knew that. That last paragraph just sounded eerily familiar, like the time I had the TV in pieces in the garage and my dad came home for lunch. doh!

Yeah, it amazes me the people who can least afford to ruin a chassis are the ones most likely to rip it apart without studying up on what they're doing. The internet is an incredible resource. A little deductive reasoning and research skill and there's no reason you can't begin any project fully armed with all the information you would need.

[jedclampit]

talk about those who can least afford it, that's why I'm into these little suckers, mod'em, race'em anywhere until they need another rebuild or just say screw it and order a few more for 10 bucks a pop then mod'em, race'em again. I'm all out of mods until the guru's kick in something else for me to try, cant think of anything original meself, just a dumb bio major. The FET mod is the greatest mod for these little cars, forget about the dual battery thing.

Cant imagine what the price of my ginea pig mentality would be on anything bigger and higher quality.

[dr1zz]

Originally posted by jedclampit
The FET mod is the greatest mod for these little cars, forget about the dual battery thing.

amen to that!

unless it a dual batt/fet'd zip..