Mosfet upgrade

mcguyver · December 16th, 2006, 15:14

Diodes are rated for reverse bias breakover voltage. The minimum that should be used is 5amp 1000v. 50v would not be sufficient and 1 watt at 10 volts is 0.1A. Diodes are not rated in watts, only resistors.

Perhaps you should leave manufacture of such devices to those with electronics experience. These are very basic concepts.

I also noticed that you have mosfets rated for 250A for 30sec.? Not likely and not in a TO-220 case you don't. Maximum I've seen in 15 years has been 75A and they were extremely expensive. A FET in this case size may handle 250A, but for milliseconds prior to its destruction. Any case larger than TO-220 and you'll have problems fitting the board into any gun except a full-stock M4 or MP5.

Purchase the premade ones for $40 U.S. and save yourself the trouble

MadMax · December 16th, 2006, 15:27

You can probably easily get away with 35A rated FETs if you heatsink them to a hunk of metal like an outer barrel. There isn't much point in extreme amp FETs when your battery pack can't come close to providing that much current. Biggest pack I've heard of in airsoft is a 14.8v 4.6Ah Lion pack which can supply 86A continuous and I've got it. I call it the weld pack. Still, it's massive overkill as I don't think any AEG motor can sink that much current before making that burning electronics smell.

Kos-Mos · December 17th, 2006, 02:09

here is part number. check it out by yourself...

SUM110N02-03P
Made by Vishay Siliconix

And I did a mistake... it is rated 300A pulsed.

here is a direct link to the datasheet.

As for the diode, I don't really mind since I can add then anytime later. If the FETs can't handle the feedback pulse, then I will had some kind of protection.

Package is TO-263 D2PAK

Mantelope · December 17th, 2006, 02:14

Quote:

Originally Posted by Kos-Mos

here is a direct link to the datasheet.

http://www.vishay.com/docs/72096/72096.pdf

Kos-Mos · December 17th, 2006, 05:20

ya thx forgot to paste it.

SEALs · December 29th, 2006, 02:49

Beside, I just found this on the net, its in russian but you can figure out how systema did theres

http://www.black-wolf.ru/makenotes/makenotes014.bwc

Kokanee · January 4th, 2007, 00:05

It's a wintereenmas miracle!

http://www.wgcshop.com/pcart/shopper...-MOSFET_srch_1

- MOSFET Unit completed as a single package, replacing Mechanical Main Switch
- High Quality USA-Made 16 Gauge Wire for Input & Output
- Battery input up to 15V
- Recommended up to M150 / 300% springs

Advantages of MOSFET instead of Mechanical Switch
* Reduces lost of power during contact of switch.
* Prevent sparkle which leads corrosion of switch contacts ( especially semi-auto ).
* Mechanical switch remains as signal switch for greater durability.
* Fast Response and high efficiency, suitable for high power upgrades.

Kos-Mos · March 8th, 2007, 17:23

Finally done the MOSFET unit...

works well... and I don't need to add any protection (ie diode or anything)

I used an other motor than the one in the mechboxes for the testings... bigger and draining a lot more current. The FETs got a bit hot, but stay cold when using in the gun.

I also have noticed an increase in ROF. Will have to test this later at a field.

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December 16th, 2006, 15:14	#16
mcguyver Trader rating Join Date: Aug 2005 Location: Northern Alberta	Diodes are rated for reverse bias breakover voltage. The minimum that should be used is 5amp 1000v. 50v would not be sufficient and 1 watt at 10 volts is 0.1A. Diodes are not rated in watts, only resistors. Perhaps you should leave manufacture of such devices to those with electronics experience. These are very basic concepts. I also noticed that you have mosfets rated for 250A for 30sec.? Not likely and not in a TO-220 case you don't. Maximum I've seen in 15 years has been 75A and they were extremely expensive. A FET in this case size may handle 250A, but for milliseconds prior to its destruction. Any case larger than TO-220 and you'll have problems fitting the board into any gun except a full-stock M4 or MP5. Purchase the premade ones for $40 U.S. and save yourself the trouble __________________ Age verifier Northern Alberta Democracy is two wolves and a sheep discussing what's for dinner. Freedom is the wolves limping away while the sheep reloads. Never confuse freedom with democracy. Last edited by mcguyver; December 16th, 2006 at 15:31..

December 16th, 2006, 15:27	#17
MadMax Delierious Designer of Dastardly Detonations Trader rating Join Date: Dec 2001 Location: in the dark recesses of some metal chip filled machine shop	You can probably easily get away with 35A rated FETs if you heatsink them to a hunk of metal like an outer barrel. There isn't much point in extreme amp FETs when your battery pack can't come close to providing that much current. Biggest pack I've heard of in airsoft is a 14.8v 4.6Ah Lion pack which can supply 86A continuous and I've got it. I call it the weld pack. Still, it's massive overkill as I don't think any AEG motor can sink that much current before making that burning electronics smell. __________________ Want nearly free GBB gas?

December 29th, 2006, 02:49	#21
SEALs Trader rating Join Date: Dec 2001 Location: Watchin' your 6.	Beside, I just found this on the net, its in russian but you can figure out how systema did theres http://www.black-wolf.ru/makenotes/makenotes014.bwc __________________ If you're short of everything except enemies, you're in combat. D.O.W. SEALs Father of fear, reckless and widowmaker

December 17th, 2006, 02:09	#18
Kos-Mos Trader rating Join Date: Nov 2005 Location: Lévis (QC)	here is part number. check it out by yourself... SUM110N02-03P Made by Vishay Siliconix And I did a mistake... it is rated 300A pulsed. here is a direct link to the datasheet. As for the diode, I don't really mind since I can add then anytime later. If the FETs can't handle the feedback pulse, then I will had some kind of protection. Package is TO-263 D2PAK

December 17th, 2006, 05:20	#20
Kos-Mos Trader rating Join Date: Nov 2005 Location: Lévis (QC)	ya thx forgot to paste it.

January 4th, 2007, 00:05	#22
Kokanee Ministry of Peace Trader rating Join Date: Mar 2002	It's a wintereenmas miracle! http://www.wgcshop.com/pcart/shopper...-MOSFET_srch_1 - MOSFET Unit completed as a single package, replacing Mechanical Main Switch - High Quality USA-Made 16 Gauge Wire for Input & Output - Battery input up to 15V - Recommended up to M150 / 300% springs Advantages of MOSFET instead of Mechanical Switch * Reduces lost of power during contact of switch. * Prevent sparkle which leads corrosion of switch contacts ( especially semi-auto ). * Mechanical switch remains as signal switch for greater durability. * Fast Response and high efficiency, suitable for high power upgrades.

March 8th, 2007, 17:23	#23
Kos-Mos Trader rating Join Date: Nov 2005 Location: Lévis (QC)	Finally done the MOSFET unit... works well... and I don't need to add any protection (ie diode or anything) I used an other motor than the one in the mechboxes for the testings... bigger and draining a lot more current. The FETs got a bit hot, but stay cold when using in the gun. I also have noticed an increase in ROF. Will have to test this later at a field.

Mosfet upgrade

Upgrades & Modifications