to my MOSFET wiring Page
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First, some background on MOSFET Fire
When any switch is closed or opened,
there's an instant spark at the contacts.
This is because power is trying to flow
before the surfaces are completely together,
and when the switch is opened, the
current want to resist being interrupted.
That spark is material burning.
After a number of cycles, the condition
worsens as the contact points erode and result in increased
At some point, the
resistance is too much, and the switch fails to function.
Now in a stock AEG, this usually won't
become a problem during the service life of the assembly.
The contacts in most of them are pretty
robust. If your gun is staying stock, you're done reading
here, skip this whole process...
add a stronger spring, a beefed motor, etc, and the contacts
have to work harder.
electrical/electronic systems only use mechanical contacts for
VERY heavy loads, that are not frequently switched.
For anything less, the transistor is the
A transistor (in our case,
the Metal Oxide Silicon Field Effect Transistor) is a neat
little device that acts as an electronic "switch".
Usually, they are used to interrupt the
NEGATIVE power lead in a system.
is the opposite of nearly every circuit that uses switch
Including AEG's. This is
important, because it means the wiring the gun came with needs
to be changed in operation.
the trigger giving POSITIVE to the motor to activate it, we
are going to feed NEGATIVE to the motor to turn it on.
I've constructed a simple circuit to
illustrate MOSFET wiring:
Note that the
negative lead goes into the 'FET and back out, then going to
the black negative lead from the gun.
The red, positive lead from the gun goes
right to the positive lead from the battery.
The yellow lead is our new trigger wire.
When the trigger is pulled, the MOSFET is on, feeding negative
to the gun.
Going to the inset pic,
the leads on (most) 'FET's are laid out:
"GAIN" is the lead that waits for you to
pull the trigger or close a switch, giving it POSITIVE
"DRAIN" is the item needing
power, and suitably, "SOURCE" is the power available from the
negative side of the power source.
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