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Mosfet reliability and failure modes

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Old July 19th, 2013, 16:57   #1
TheYellowDart
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Join Date: Aug 2003
Location: Vancouver, BC
Mosfet reliability and failure modes

How are today's off the shelf airosft mosfets in terms of reliability and failure mode?

The first and last time I tried using a mosfet a couple of years ago, it fried after less than a couple dozen shots over the course of two days. It failed closed, so the aeg wouldn't stop firing on full auto until I unplugged the battery. Freaked out my wife too.

I'm thinking about trying a mosfet again, but don't want it to fail and get stuck on full auto. Especially if using a Lipo in a sealed up buffer tube that's cumbersome to get to.
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Old July 19th, 2013, 17:25   #2
lurkingknight
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don't buy a cheap mosfet unit. I swear by extreme-fire.com products because of Terry's overwhelmingly good service and track record. He has a very low failure rate and his units are very well built.
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Old July 19th, 2013, 18:24   #3
wind_comm
 
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if you really dont want it to fail, get an extreme-fire.

there are also plenty of homemade fets from reputable makers on ASM.
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Old July 19th, 2013, 19:11   #4
K3vX
 
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Speaking of ExtremeFire mosfet. Can you disable the AB on the computerized FETs?
Which one would you recommend for ROF control without AB.
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Old July 19th, 2013, 19:45   #5
RaisinBran
 
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Look for a hamster fet on ASM, apparently they are amazing and I have one on the way.
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Old July 19th, 2013, 20:18   #6
cetane
 
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The gate ones stealth has on airsoftstore.ca ok too
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Old July 19th, 2013, 20:51   #7
Oshiha
 
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The cheetah 2N with triggermaster software let's you turn AB on and off, and let's you control the ROF as well. I have one and it was a great investment. Any problems, and terry usually replies to you in about 24 hours.
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Old July 19th, 2013, 20:53   #8
KenTsui
 
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I've been using my home-made 3034 mosfet for over 3 years now. Still works fine.
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Old July 19th, 2013, 20:56   #9
Hectic
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Gate merf 3.2. Nuff said. All the features you can shake a stick at round 60 bucks.
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Old July 19th, 2013, 21:32   #10
K3vX
 
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Quote:
Originally Posted by Hectic View Post
Gate merf 3.2. Nuff said. All the features you can shake a stick at round 60 bucks.
This one's nearly perfect, except I want the ability to turn AB on and off, and I'm stuck with deans (not a con, but I can't try other things).
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Old July 19th, 2013, 21:48   #11
Ron-E
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I have installed 4 MERF 3.2s on 4 different rifles and have yet to see one fail. I run them on 2 of my own rifles, not able to turn off AB sucks but the other features make up for it.
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Old July 19th, 2013, 22:07   #12
TANNER
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+1 for the Gate fet's from airsoftstore. Never had one fail. Not a huge fan of the Xtreme fire fets as I always worry about the wires falling out (which they do often).
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Old July 20th, 2013, 18:39   #13
IggysPiggy
 
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No matter what anyone says or builds Terry's track record can't be beat. Extreme-fire all the way.
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