p90 mosfet issue

THe_Silencer · October 1st, 2010, 18:33

I recently installed a mosfet I bought off RSOV http://rsov.com/index.php?target=pro...roduct_id=3896 over a year ago and everything was working fine and dandy. My ROF increased about 2 RPS on my 9.6v battery and there was no arcing on the trigger contacts.It even feeds better now that the air nozzle fully returned to the rear more frequently! I did notice that the mosfet got a bit hot though, not sure if that's normal. I then plugged in my 11.1v lipo, pulled the trigger and my gun started to fire uncontrollably without stopping! Luckily, the positive wire that connects to the motor came off and it stopped. I reconnected everthing and tried again with my 9.6v and it did the same thing, which is baffling b/c the trigger contact weren't even touching! I desoldered and resolderd everything and still got the same results. So I swapped the 2 mosfet wires that were connected to the trigger contacts and that seemed to solve the issue, my p90 wasn't firing uncontrollably anymore. BUT now my trigger contacts arc when the contact!. Just for shits and giggles I swapped the trigger wires around and it when back to the uncontrollable firing again. Anyone have a clue what's going on and how to fix it?

HKGhost · October 1st, 2010, 18:53

your mosfet is fried. get a new one.

THe_Silencer · October 1st, 2010, 18:57

Fuck! Already?! It's barely been 2 days since I installed it! Was it b/c
lipo+ shit mosfet =fail?

HKGhost · October 1st, 2010, 19:06

it could be that. Did you have a fuse installed?

Quote:

Originally Posted by THe_Silencer

Fuck! Already?! It's barely been 2 days since I installed it! Was it b/c
lipo+ shit mosfet =fail?

THe_Silencer · October 1st, 2010, 19:11

nope

HKGhost · October 1st, 2010, 19:13

no fuse + stock wires + lipo + cheap mosfet = KABOOM.

HKGhost · October 1st, 2010, 19:17

contact DonP for a new mosfet.

ThunderCactus · October 1st, 2010, 19:35

Some mosfets just aren't designed to handle that kind of current. And if your not running an SW-COMP, it's a REALLY good idea to have a fuse of the appropriate size for your LiPo installed in the circuit

THe_Silencer · October 1st, 2010, 19:45

Are there any decent ones that don't cost much more than $30?

Short Round · October 1st, 2010, 21:43

Well that is a buzz kill

ThunderCactus · October 1st, 2010, 22:41

http://unconventional-airsoft.com/we...roducts_id=198

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October 1st, 2010, 18:33	#1
THe_Silencer Trader rating Join Date: Jul 2009 Location: Hamilton,ON	p90 mosfet issue I recently installed a mosfet I bought off RSOV http://rsov.com/index.php?target=pro...roduct_id=3896 over a year ago and everything was working fine and dandy. My ROF increased about 2 RPS on my 9.6v battery and there was no arcing on the trigger contacts.It even feeds better now that the air nozzle fully returned to the rear more frequently! I did notice that the mosfet got a bit hot though, not sure if that's normal. I then plugged in my 11.1v lipo, pulled the trigger and my gun started to fire uncontrollably without stopping! Luckily, the positive wire that connects to the motor came off and it stopped. I reconnected everthing and tried again with my 9.6v and it did the same thing, which is baffling b/c the trigger contact weren't even touching! I desoldered and resolderd everything and still got the same results. So I swapped the 2 mosfet wires that were connected to the trigger contacts and that seemed to solve the issue, my p90 wasn't firing uncontrollably anymore. BUT now my trigger contacts arc when the contact!. Just for shits and giggles I swapped the trigger wires around and it when back to the uncontrollable firing again. Anyone have a clue what's going on and how to fix it? __________________ It is the mark of an educated mind to be able to entertain a thought without accepting it - Aristotle -Founder of Steel City Hamilton Infantry and Tactics -Certified level 43 Autosniper by Commander Amos

October 1st, 2010, 18:53	#2
HKGhost Trader rating Join Date: Nov 2009 Location: Mississauga, ON	your mosfet is fried. get a new one. __________________ Please email me as I'm not on ASC too often. Custom Build \| Upgrades \| Repairs \| Maintenance Contact: ghostgunwork@gmail.com / Private Message

October 1st, 2010, 18:57	#3
THe_Silencer Trader rating Join Date: Jul 2009 Location: Hamilton,ON	Fuck! Already?! It's barely been 2 days since I installed it! Was it b/c lipo+ shit mosfet =fail? __________________ It is the mark of an educated mind to be able to entertain a thought without accepting it - Aristotle -Founder of Steel City Hamilton Infantry and Tactics -Certified level 43 Autosniper by Commander Amos

October 1st, 2010, 19:11	#5
THe_Silencer Trader rating Join Date: Jul 2009 Location: Hamilton,ON	nope __________________ It is the mark of an educated mind to be able to entertain a thought without accepting it - Aristotle -Founder of Steel City Hamilton Infantry and Tactics -Certified level 43 Autosniper by Commander Amos

October 1st, 2010, 19:13	#6
HKGhost Trader rating Join Date: Nov 2009 Location: Mississauga, ON	no fuse + stock wires + lipo + cheap mosfet = KABOOM. __________________ Please email me as I'm not on ASC too often. Custom Build \| Upgrades \| Repairs \| Maintenance Contact: ghostgunwork@gmail.com / Private Message

October 1st, 2010, 19:17	#7
HKGhost Trader rating Join Date: Nov 2009 Location: Mississauga, ON	contact DonP for a new mosfet. __________________ Please email me as I'm not on ASC too often. Custom Build \| Upgrades \| Repairs \| Maintenance Contact: ghostgunwork@gmail.com / Private Message

October 1st, 2010, 19:35	#8
ThunderCactus Not Eye Safe, Pretty Boy Maximus on the field take his picture! Trader rating Join Date: Feb 2007	Some mosfets just aren't designed to handle that kind of current. And if your not running an SW-COMP, it's a REALLY good idea to have a fuse of the appropriate size for your LiPo installed in the circuit

October 1st, 2010, 19:45	#9
THe_Silencer Trader rating Join Date: Jul 2009 Location: Hamilton,ON	Are there any decent ones that don't cost much more than $30? __________________ It is the mark of an educated mind to be able to entertain a thought without accepting it - Aristotle -Founder of Steel City Hamilton Infantry and Tactics -Certified level 43 Autosniper by Commander Amos

October 1st, 2010, 21:43	#10
Short Round Najohn Trader rating Join Date: Aug 2009 Location: SkyDome	Well that is a buzz kill __________________

October 1st, 2010, 22:41	#11
ThunderCactus Not Eye Safe, Pretty Boy Maximus on the field take his picture! Trader rating Join Date: Feb 2007	http://unconventional-airsoft.com/we...roducts_id=198

p90 mosfet issue

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