Mosfet Suggestions

TheTJ · Mar 24, 2013

I've been playing for 10 years now, and I have never used a mosfet. Crazy, I know, but I think I want to diversify my profile here a little bit and give it a shot. I have been looking on extreme fire at their line of fets that are pretty cost effective, in terms of outfitting an army of aegs with mosfets, anyways.

I don't need special settings like 3 round burst or anything. Really, all I'm looking for is protection from energy spikes, trigger response time, protecting my contacts, and reducing heat.

One gun in particular, my EBR, I want a semi-only set-up. I don't exactly want to cut the selector switch or anything, so I figure a simple mosfet would be the best bet.

The rest of them I want high trigger response... This is in regards to my mp5k pdw, g3 sas, g3 ris, and mc 51. I want to retain semi and full auto, without all the flash, but gain the protection and everything else.

Does anyone have good suggestions for cheap fets that might line up with my parameters? The EBR I am more willing to spend a good amount of money on, but the others don't have to be fancy. Thanks!

vindicareassassin · Mar 24, 2013

Why not have a go at making your own :shrug:

I do, I've never bought an aftermarket FET, its buy far the cheapest option (see what I did there buy....by..... sometimes I think I should of been on the stage :hehe

, especially in veiw of you wanting to have a few :yup:

You can even make some of the Extreme-fires FETs your self as Gandolf over on ASM, who is Extreme-fire, has freely posted the schematics to some of his FETs in the High Tech section

To save you looking for them......

A good place to start if you've never done it before is Cerberus Airsofts 'How to', which is dead easy to follow, and gives you a very good base to work from.

Linky....... http://www.cerberusairsoft.co.uk/Mosfet/

I believe the FETs are now nolonger made but there's loads of equivilants, and a fair few that are better.

I cut my teeth on this one and still use it today.......

Thats the MAC I just finished last week :tup:

And my MP7s plus its capacitor bank......

Close up of the actual FET....

Get good at it and you could look at doing something like this....

Or this......

They're different designs I've built for my project M21 :nuts:

Schematic for the top one, its a copy of someone elses with some improvements made by me.......

I buy all my parts from RS Components and Farrnells here in the UK, but Digikey is worldwide so they're probably your best bet, and as your planning on doing a few it'll likely end up cheaper, as generaly the more of a component you buy the cheaper they become :yup:

The other good thing about making your own is if you enjoy tinkering with Airsoft guns, your gona love this :tup:

TheTJ · Mar 24, 2013

I love tinkering in airsoft guns, the mechanical aspect, but as far as the electrical goes I have very little basis of knowledge. Honestly, my electrical knowledge dates back to building some silly little robot in physics class back in 2007. I can solder and do simple things but when it comes to understanding exactly what's going on with those schematics you just posted... I really get lost without a "for dummies" guide.

brennon272 · Mar 24, 2013

I personally like the king kong mosfets there basically plug n play and are awesome and cheaper than most other mosfets.

vindicareassassin · Mar 24, 2013

TheTJ said:
I love tinkering in airsoft guns, the mechanical aspect, but as far as the electrical goes I have very little basis of knowledge. Honestly, my electrical knowledge dates back to building some silly little robot in physics class back in 2007. I can solder and do simple things but when it comes to understanding exactly what's going on with those schematics you just posted... I really get lost without a "for dummies" guide.

Aah, you'll not go far wrong if you follow the link to the cerberus FET, it really is idiot proof, and as you say you can solder your already half way there.

All you need to do is sort out a parts list, with quantities, and you've done the hard bit .

Trust I, your wallet will thankyou you did :yup:

Zardichar · Mar 24, 2013

brennon272 said:
I personally like the king kong mosfets there basically plug n play and are awesome and cheaper than most other mosfets.

No, those don't actually protect the trigger contacts.

vindicareassassin said:
Aah, you'll not go far wrong if you follow the link to the cerberus FET, it really is idiot proof, and as you say you can solder your already half way there.

All you need to do is sort out a parts list, with quantities, and you've done the hard bit .

Trust I, your wallet will thankyou you did :yup:

I've found that design to be overcomplicated. You can do essentially the same thing with a basic 3034 design.

vindicareassassin · Mar 24, 2013

Zardichar said:
I've found that design to be overcomplicated. You can do essentially the same thing with a basic 3034 design.

Its not that complicated, especially for an AB FET, but yes a 3034 FET is even simpler, requiring 1 less part and as long as you dont want or need braking :shrug:

Zardichar · Mar 24, 2013

vindicareassassin said:
Its not that complicated, especially for an AB FET, but yes a 3034 FET is even simpler, requiring 1 less part and as long as you dont want or need braking :shrug:

I don't like active braking as it wears down the brushes and makes the motor a bit hotter. I don't really see a huge advantage to AB unless you have bad overspin.

TheTJ · Mar 24, 2013

When I'm using any gun other than the EBR I do not so much care about the active breaking. On the EBR I want to ensure I can set up a semi-only mode regardless of anything else. AB would be an added bonus... And seeing as the most any of my magazines that I carry around can hold is 180 rounds, I will not be putting much strain on the motor anyways. It may get hot occasionally during defense missions where I basically have the greatest range/accuracy of any of my teammates set aside the BASR's, but during any other routine scenario, I play rather conservatively. I am lucky to waste one magazine.

vindicareassassin · Mar 24, 2013

Sounds like we play very similarly, I'd say go with the AB in the EBR as you say, and ordinary FETs in the rest.

The time they do produce heat is when your giving it proper yeehaa on semi, but you can counter it with a heat sink.

I did right out a whole load of guff in a thread on here not so long back that gave a stack of info on how to tune your motor etc to prevent arcing/heat build up, brush blueing etc

EDIT

Found it, it's the thread a little way down the first page regarding AB FETs and ARL removal

TheTJ · Mar 25, 2013

I've been reading through all of your information there. It all makes sense to me, but I still have some anxiety with electronics like that. I can build computers, but I can't work on a board for the life of me. You wouldn't be able to send any premade 'fets to the states, would you? I'll gladly pay for the parts/labor.

I've always wanted to try to drop a gun in the mail to you and see the kind of work you do because you have a damn plethora of information in that noggin of yours, but hell even Redwolf guns that are shipped here get ripped apart by customs and show up missing pieces. I could only imagine that a gun shipped from civilian to civilian would get destroyed in transit.

Honestly, money isn't much of an issue to me, I guess I've fallen into that bracket where my work is starting to take over my life so much that I don't have time to spend my money, so it usually just sits there in my bank account.

Let me know if you have any interest in being a supplier ^_^

Zardichar · Mar 25, 2013

TheTJ said:
I've been reading through all of your information there. It all makes sense to me, but I still have some anxiety with electronics like that. I can build computers, but I can't work on a board for the life of me. You wouldn't be able to send any premade 'fets to the states, would you? I'll gladly pay for the parts/labor.

I've always wanted to try to drop a gun in the mail to you and see the kind of work you do because you have a damn plethora of information in that noggin of yours, but hell even Redwolf guns that are shipped here get ripped apart by customs and show up missing pieces. I could only imagine that a gun shipped from civilian to civilian would get destroyed in transit.

Honestly, money isn't much of an issue to me, I guess I've fallen into that bracket where my work is starting to take over my life so much that I don't have time to spend my money, so it usually just sits there in my bank account.

Let me know if you have any interest in being a supplier ^_^

I make basic 3034 fets, but they don't have AB. You can find out more here:
http://www.airsoftsociety.com/classifieds/zardichars-tech-work-price-list-mosfets-too-5677.html

vindicareassassin · Mar 25, 2013

TheTJ said:
I've been reading through all of your information there. It all makes sense to me, but I still have some anxiety with electronics like that. I can build computers, but I can't work on a board for the life of me. You wouldn't be able to send any premade 'fets to the states, would you? I'll gladly pay for the parts/labor.

I've always wanted to try to drop a gun in the mail to you and see the kind of work you do because you have a damn plethora of information in that noggin of yours, but hell even Redwolf guns that are shipped here get ripped apart by customs and show up missing pieces. I could only imagine that a gun shipped from civilian to civilian would get destroyed in transit.

Honestly, money isn't much of an issue to me, I guess I've fallen into that bracket where my work is starting to take over my life so much that I don't have time to spend my money, so it usually just sits there in my bank account.

Let me know if you have any interest in being a supplier ^_^

To be honest mate, much as I'd love to make something for you, by the time I ship stuff in make it and then ship it off to you it'd be quicker and easier if you order a cheetah off terry at Extreme-fire, as anything I make will be similar, if not the same, as that :shrug:

TheTJ · Mar 30, 2013

vindicareassassin said:
To be honest mate, much as I'd love to make something for you, by the time I ship stuff in make it and then ship it off to you it'd be quicker and easier if you order a cheetah off terry at Extreme-fire, as anything I make will be similar, if not the same, as that :shrug:

Gotcha man, thanks for the heads up. I think for now I'm going to buy a premade for my M14, and maybe pick up a side hobby for my other guns to work on these schematics you provided. I'll let you know how everything goes.

Mosfet Suggestions

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vindicareassassin

TheTJ

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Zardichar

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Zardichar

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TheTJ

Zardichar

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TheTJ

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