Battery question.

[PT247]

wizards

 

[jcheeseright]

 

[CaptainSwoop]

metal–oxide–semiconductor field-effect transistor

http://en.wikipedia.org/wiki/MOSFET

http://en.wikipedia.org/wiki/Transistor

A transistor is a semi-conductor device used to amplify and switch electronic signals and power.

It uses a small control voltage to switch on and off a larger power voltage.As already posted a high voltage or current across a conventional metal contact switch can cause arcing that damages the switch contacts and can cause a drop in voltage.

Transistors are 'solid state' they don't have any physical metal contacts so their operation is faster and there is no arcing.

In Airsoft terms a 'Mosfet' is actually a small device made up of several components sometimes on a small circuit board, sometimes just encapsulated in shrink wrap. One or more of the components in the device is an actual MOSFET.

 

[AK47frizzle]

So I know what it does, trigger contacts etc. But I don't know how it does it? Sounds about right with my poor airsoft vocabulary

basically, if you wire it all up, the trigger contacts become a switch.

Think of it like a TV and a TV remote. The mosfet is like the tv remote and the TV uses the mains as a power supply.

So a Tv remote uses 2 AA batteries. They add up to 3 volts, not that much.

A TV, uses the mains which is 230V, and that 230v goes directly to the TV (then a transformer will step down the voltage to some lower number but you don't need to know that)

3 volts compared to 230v is not much. But is it enough to control the TV with the remote.

SO the trigger contracts become low powered like the TV remote and the motor takes on the full 7.4v or 11.1v from the battery and the trigger contacts tell it to turn on or off, like a tv remote; it can turn a TV on or off using a voltage supply.

That somewhat how a mosfet works. But if want to get into detail, click the spoiler.

Spoiler

So, a mosfet has a magnet in it (i think, i'm not too sure), 2 electrodes either side.

I think they require 2.4v generally to turn on but when it is turned on, the magnet will attract electrons inside it and it will all stick to the magnet in a very fine line, essentially making connecting the electrodes together like a bridge. This bridge allows electricity (flow of electrons) to pass through it and power your airsoft gun motor.

 

[Lozart]

So, a mosfet has a magnet in it (i think, i'm not too sure), 2 electrodes either side.

I think they require 2.4v generally to turn on but when it is turned on, the magnet will attract electrons inside it and it will all stick to the magnet in a very fine line, essentially making connecting the electrodes together like a bridge. This bridge allows electricity (flow of electrons) to pass through it and power your airsoft gun motor.

[electronics engineer]HHHNNNNGGGGNNGNGGGGGG!!![/electronics engineer]

You're just trying to give me an aneurysm now, aren't you?

 

[CaptainSwoop]

There are no magnets in a Mosfet. It is 'solid state' Read the links in my post above

 

[AK47frizzle]

that's why i said i'm not too sure

 

[Lozart]

There are no magnets in a Mosfet. It is 'solid state' Read the links in my post above

I think...think he was doing comedy.

 

[Ian_Gere]

that's why i said i'm not too sure

one of the more glaringly unnecessary pieces of reportage amongst today's contributions :lol:

Really? You're not sure? I would never have guessed!

 

[Ian_Gere]

Anyhoo, my two pen'orth on MOSFET's = if you're AEG is going to be in bits for any reason and you don't already have one fitted, at the very least put a Gate PicoSSR in there - they're not that expensive either from gunfire.pl or fire-support, they're tiny so there will be enough space in any gun and they make that first shot lovely and crisp even using an NiMh battery. While you're at it, as in strike while the soldering iron's hot (see that didja?), you should also change to Deans connectors b/c they provide a greater surface area of solid connection and far less tendency for micro-arcing, which not only damages contacts, it does a number of things which Loz is more qualified to explain to mess up the supply of power even though there is an established connection alongside that conducted across the connector by arcs. This is far more of a problem in my world of audio than AEG's, but nonetheless a motor is a massive coil and arcing is an electromagnetic signal...