Where to get Electronis parts?

Stercus Accidit

For mosfets etc.

I'm looking into making a few mosfet units, so I can use semi more and with a high voltage.

Is there a shop online I can get the mosfets, high grade wire, solder and heat shrink?
I think I will need a heat sink also, and tbh havnt a clue how to create active breaking to prevent peaks in the voltage when releasing the trigger.
Apparently the bridging with a high resistor method doesnt work as well as its supposed to.

I've read conflicting reviews of the philipino airsoft method, and some about the guarder and systema pre-made units, some slating the methods used.

Should I try and make a pcb rather than just wire the whole thing up? And what is the best design for a mosfet with fet active breaking, for say, 10.8 volts and lots of semi use.

This is going to be a real electronics fest.

Dex.... Where are you! (hes very much in demand at the moment..)

extremetaz

best bet is online, radionics, farnell, rapid electronics.. all have good stocks and quick delivery.

they're not all that cheap though so might be a notion to make up a list of a few bits you need and buy it all in one go.

Motosam wrote: »

For mosfets etc.

I'm looking into making a few mosfet units, so I can use semi more and with a high voltage.

Is there a shop online I can get the mosfets, high grade wire, solder and heat shrink?
I think I will need a heat sink also, and tbh havnt a clue how to create active breaking to prevent peaks in the voltage when releasing the trigger.
Apparently the bridging with a high resistor method doesnt work as well as its supposed to.

I've read conflicting reviews of the philipino airsoft method, and some about the guarder and systema pre-made units, some slating the methods used.

Should I try and make a pcb rather than just wire the whole thing up? And what is the best design for a mosfet with fet active breaking, for say, 10.8 volts and lots of semi use.

This is going to be a real electronics fest.

Dex.... Where are you! (hes very much in demand at the moment..)

kdouglas

I use IRF3707's from radionics for mosfets, they're decent enough, although for my 10.8v setup, I run two of them in parallel to handle the extra load.

Wiring it all up without stripboard can be messy, so it's easier to use them, i've yet to do a setup with active braking, but you'll need a pair of mosfets to do it, one N-channel, the other P-channel (IRF3707 is N-channel)

Stercus Accidit

Do you etch the board yourself?

ir3707s, what made you decide on them? n and p, how do you integrate them in the same circuit?

The active braking isn't needed imo for wear, but the peaking of the voltage when the trigger is released worries me, how will this affect the aeg?
I think an FET unit is used, but how is this wired in?

Stercus Accidit

http://www.arniesairsoft.co.uk/classifieds/showproduct.php/product/669/cat/7/date/1154345982

Look good?

Found this by accident, do those ratings look good?

Anyone with mosfet knowledge, to me, this looks like a decent deal, seeing as I'm a electrotard, the soldering it in will be a challenge alone for me

Mark_Sc

kdouglas wrote: »

I use IRF3707's from radionics for mosfets, they're decent enough, although for my 10.8v setup, I run two of them in parallel to handle the extra load.

Wiring it all up without stripboard can be messy, so it's easier to use them, i've yet to do a setup with active braking, but you'll need a pair of mosfets to do it, one N-channel, the other P-channel (IRF3707 is N-channel)

Uh... WHAT!?!???

...I've never flt so ignorent:(

Boston

Mark_Sc wrote: »

Uh... WHAT!?!???

...I've never flt so ignorent:(

Here, try this.

heres some more.

In away I find this thread depressing as it reminds me of all the stuff I've forgotten.

Mark_Sc

Nice one!

Mark_Sc

So on a scale of one to ten, how hard is adding these mosfet thingys?

Boston

Okm heres a step by step guide to how to install the mosfet kdoughlas mentioned. Its well doable from that guide. But it all depends on how good you are at your electronics. Personally I'd like to see it being done first.

And this is what I was looking for. From that anyone could wire one of these up.

Stercus Accidit

Completed ones, well, easy I guess.

Google how to solder, great stuff.

kdouglas

if your not comfortable soldering or have never made a circuit before, i'd recommend buying one rather than making one yourself, much easier. extreme-fire.com are pretty good for them, there's also a version with active braking.

then there's the brand new computer controlled mosfet which has active braking, battery monitor/low battery warning via motor vibration and 3-round burst, have one sitting on my desk but haven't had a chance to install it yet, they look pretty sweet

just to clarify, a mosfet is useful for higher voltages because it stops your trigger contacts wearing out too quickly from the contacts arcing
active braking can help increase the life of your gearbox, especially in high rate of fire setups and for single shot since it actively stops the motor once you've let go of the trigger (or the cut off lever activates in single shot mode) an active braking circuit is a bit more complex than a single mosfet but not incredibly so, i've yet to actually try one though.

the article on airsoftmechanics.com is fairly good and explains it quite well: http://www.airsoftmechanics.com/home/content/view/23/30/

Stercus Accidit

Motosam wrote: »

http://www.arniesairsoft.co.uk/classifieds/showproduct.php/product/669/cat/7/date/1154345982

This is one mentioned above KD, its a guy making them on his own and with apparently free shipping, do they look like they are good?
Seems like great value if they are.

Boston

kdouglas wrote: »

then there's the brand new computer controlled mosfet which has active braking, battery monitor/low battery warning via motor vibration and 3-round burst, have one sitting on my desk but haven't had a chance to install it yet, they look pretty sweet

Where did you get that? Whats the microcontroller? Is it a pic?

kdouglas

Boston wrote: »

Where did you get that? Whats the microcontroller? Is it a pic?

http://extreme-fire.com/SW-COMPUTER.html

The main feature you'll notice with it is 3 round burst, but there's a few other subtle things aswell, there's a lot of possibilities with it, it's been released as open source, so anyone can write code for it to add any extra features they want, one possibility would be to modify a hopup unit with a light sensor so that you can detect if/when there is a bb in the hopup unit, if there was none, you can use this to stop the aeg being dry fired. There's also the option of using a magnetic sensor to record the position of the piston, making it possible to stop the piston just before it releases, effectively pre-cocking it, this would be useful for sniper aegs and also makes things more realistic since the aeg would fire as soon as you press the trigger, without any delay.