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Full Version: what is a mosfet and what does it do?
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I keep on reading about a mosfet. what is it and what does it do?
QUOTE (deadjoker08 @ Jul 26 2010, 10:28 AM) *
I keep on reading about a mosfet. what is it and what does it do?

This isn't the most precise explanation, you can google mosfet if you want to know more than the basics:

A mosfet is a switch; It requests an on/off signal from 1 low load source and actuates the circuit for a higher load source. It's a lot like a relay.

The benefits in airsoft are that that, instead of flowing the full current through the trigger contacts then into the motor, you use the trigger contacts for your low load source, and route the current from the battery through the mosfet and directly into the motor. This keeps your trigger contacts from getting burnt up as well as allowing a less resistive path for the current going to the motor. This translates to longevity for your trigger contacts and quicker trigger response via less resistive pathing.
wow that sounds pretty complicated and expensive for me lol. how much would it cost to do something like that? and is there a parts list and a place to get all this stuff?
You can buy MOSFETs premade, however it is usually cheaper to make them. I bought my MOSFET for around $50 (pre made) and installed it myself. I highly recommend, however you can also check out AWS airsoft, and Infected Armory for cheaper MOSFETs. (Realize that IA MOSFETS are not very good and I have heard several stories of them failing.
MOSFETS are sort of like a computer chip I have seen them for sale into the hundreds. I would use them if you use a lipo battery though.
im just a every saturday player and play with my buddies at his house should I even worry about it then? I mean my m4 works perfectly fine.
I'd say they are always a good idea, but you don't need them. If you ever start using lipo batteries or anything larger than a 9.6v you should get them.

When you pull the trigger, you connect a circuit, causing your motor to turn. The higher the voltage, the more energy is flowing through your trigger. There are stories of people putting 11.1v lipo batteries into their guns and their trigger becomes overloaded with power and actually melt and fuse together. Mosfets redirect the power so it just goes straight from the battery to the motor, and only a trickle goes through the trigger itself.

I've got mosfets in both of my guns, but I'm also only running 9.6v batteries. One has a special $75 mosfet, the other has a good cheap $25 one.

Check out the upgrades and modifications pinned topics, one of them is about mosfets and how to make them. From what I understand you can make a good one for just a couple of dollars, if you have the soldering and electrical know how to do it.
based on what your saying about being a back yard player; the fact that you didn't know what a mosfet was or anything about their pricing, I would conclude you probably need to overlook it. This isn't said to offend you, but even the purchase and installation of mosfets requires at least a working knowledge of electronics / wiring / soldering. It doesn't sound like you're in a situation where you need one, so skipping it is probably your best option.
plus, if you have an upgraded gun, especially one that shoots at a high ROF like you would get with a mosfet, your freinds will probably not want to play with you for fear of getting their censored2.gif shot of. thats what happens whenever I play with my friends in the backyard, so I use one of my guns that I havent upgraded. my jg m4 s-system... good gun by the way.

Does this answer your question?

If your willing to do enough research and teach yourself how to solder, making your own mosfet might be worth it, even if just for the experience.

Also, they are MUCH cheaper to make your self. The actuall MOSFET itself only costs a few dollars (if that) plus a few resistors, which are pocket change cheap. The most expensive part could end up being the soldering iron.
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