mosfet

[sanborn]

what is a mosfet its just i hear about them all the time and dont know what the do.

cheers.

[Widgit]

Re: mosfet

It basically sits between the battery and motor causing the current to go through a circuit based system as opposed to the more standard trigger switch. It means you get a better trigger response, and shouldn't burn out your trigger contacts.

[Fizzy]

Re: mosfet

http://www.zeroin.co.uk/search.php?searchid=1632116

There you go, knock yourself out...

[mack]

Re: mosfet

rather than start a new thread, has anyone tried a dream army mosfet?

[HuntR]

Re: mosfet

Yes, and they are crap

[mack]

Re: mosfet

il avoid them then lol

[sanborn]

Re: mosfet

so am i best getting one and if so what should i get,

[North West Outpost]

Re: mosfet

Yes, and they are crap

Why? They are a basic fet with a fuse. They do improve trigger response Ive tried them, I may even get round to swapping the fuse for thermal re setting fuses. Just to improve things.

There isn't much difference between those and other basic fets.

[HuntR]

Re: mosfet

It's basic which is why it's crap. There isn't a need for one unless your using a lipo. Which if you are you want an AB mosfet to stop motor overspin.

Just my personal opinion of course. If your going to get one i'd at least get a decent one that's worth getting

[No1_sonuk]

Re: mosfet

what is a mosfet its just i hear about them all the time and dont know what the do.

A MOSFET is a Metal Oxide Semiconductor Field Effect Transistor. It's a solid-state electronic switch with very low on resistance.
In the airsoft context, most people use the word "MOSFET" to refer to a MOSFET controller - a device which uses a MOSFET to replace the gun's trigger contacts.
This has 2 main effects:-
1- Because a very low current is needed to turn on the MOSFET (they work on voltage, rather than current), it removes the need for the high motor current to go through the trigger contacts, making them last longer.

2- The on resistance of the MOSFET is lower than that of the trigger contacts, meaning more of the battery's current can get to the motor.

Complexity ranges from the very simple single MOSFET and resistor that just replace the trigger contacts, to microcontroller-driven setups that include fire modes, battery monitoring, etc.

http://www.zeroin.co.uk/search.php?searchid=1632116

There you go, knock yourself out...

No Results...

[North West Outpost]

Re: mosfet

It's basic which is why it's crap. There isn't a need for one unless your using a lipo. Which if you are you want an AB mosfet to stop motor overspin.

Just my personal opinion of course. If your going to get one i'd at least get a decent one that's worth getting

So had you have put they are a basic fet without Active breaking, it would have been a better explanation rather than just crap.

So a better explanation would be. They are a basic fet that doesn't offer active breaking. You don't always need active breaking even with LiPo's if you use most 7.4's and a torque motor as that helps to slow the cycle as you know.

Conversly you can also blow your fet in super fast set ups using AB fets. Which ever way you look at it a simple fet is Neg and will take the strain from the trigger contacts and keep everything in order. When you add the P fet into the mix this is what shorts the motor out and stops it dead in its tracks. If you feel your motor getting hot in a super fast set up and big batteries it's the P fet doing that. If it all gets to hot it will be the P fet that goes first and takes the N fet with it. Unless there is a mechanical fault of course.

I am looking at trying some super fets and a completly different way of setting guns up right now. So there will be no need for AB fets, just some super simple fets with thermal resetting fuses, big springs and Ultra torque motors. But with site friendly fps and can be tuned quite accuratly for fps.

I can't use an AB fet im my dsg for example as they are way to fast to correctly use the breaking and will blow.

[mirlock]

Re: mosfet

I think i was reading somewhere once that some fets can be programmed for 1 complete cycle memory.
If this is the case wouldnt that rule out the need for AB in a fet ?

[North West Outpost]

Re: mosfet

Some of the burst fets do that.

[HuntR]

Re: mosfet

Agreed with Midas. I shouldn't have been so hasty with my reply.

[North West Outpost]

Re: mosfet

Hunter I wasn't having a go. But you are a regular and respected member of the forum and I think that if some of the younger and newer members see some of the remarks from older, longer standing members, they take notice of what they say.