Trigger Master MOSFETs
 

Oh hai guyz,

So I just finished installing a Trigger Master MOSFET in my CA Sportline and I'm seriously happy with the results. 3-round burst for the win.

So I pose a few questions:

Do you plan on buying one?

If you've installed one, how did you feel the installation went in terms of ease?

How do you find the long term (several games) with the upgraded AEG?

I'll be designing my own this summer with an X round burst that doesn't need to be programmed each time you plug it in. It will be more adaptable.

I just got it yeterday. Does it get hot? I am going to put it where the fuse was. Luckily have some Deans connectors. Did you have to adjust the 3 burst timing in programming mode or did it shoot 3 rounds correctly from the start?

Naglfar: it remembers your settings even after you unplug the battery.

I've installed three so far (as well as some 3 round burst unit I was given, non programmable but works very well, even if it's only 2 round burst and full auto, which I actually like a lot better) in different guns, and installation skill required ranges from intermediate (say full stock gun, battery in the back) to very advanced (battery bag on stock, TM unit in front foregrip).

Overall hooking it up is easy, but wire management is where the real challenges lie, as well as being able to work on your mechbox in the future (aka. means of disconnecting the wires).

Is a VERY capable unit, lots of range in adjustments.

Syn, it's doesn't get hot, you literally take out your wiring harness and install the TM, usually it's said to replace the fuse with the unit, largely because there has to be a place to put the unit, and it's about the same size as the fuseholder. And once yo install it and hook it up, it *should* be able to fire burst as a default (according to Don), but with my first, I had to program it to burst mode to get it to work.

Oh, I'm going to be helping Don out, I'll be populating most of the TM circuit boards in the future. Populating meaning soldering the components onto the boards. :)

It doesn't get hot when it runs normally. But if it's anything like the SW-AB-LONG (i.e. if the resetting fuse component is similar, I think) and you "trip" the fuse...don't grab it with your bare hands. When I tripped mine, it was extremely hot to the touch (not for too long but enough to notice).

I had a strange error when I first plugged it in, I think my motor was too deeply seated, as it would start up, and I would pull the trigger, but it would restart the system. after seating my motor again, it fired no problem. Did the 5 shots, then threw it into auto and it happily fired the 3-rnd burst.

Ya, I was working on Jackals rifle the past few days and got the same reset, Was because the piston would pull back and jam at the rear, causing more current draw from the unit, making it shut down and reset. The problem wasn't the TM, it was the DeepFire mechbox and some other parts that didn't like each other.

I'll give it a try for sure. Maybe advanced programming in future by stopping fire when mag is empty (mags job too)

I'm not sure how you could rig that up with a stock Trigger Master as there is nothing to tell it when the last bb has fired. :| The PTW's system for this is mechanical, no?

Good idea. Could see about a magnetic sensor in the magwell and mount a small magnet on the follower in the mags, when it gets to the top (out of ammo) the TM cuts off.

I would be all for that system

That's actually a really nice idea... Most of the other systems I have seen rely on some mechanical interference from a protrusion on the follower and seem to be a bit touchy...

This idea is being thrown around in another thread right now too. Seems everyone's in a creative mood.


http://www.airsoftcanada.com/showthread.php?p=701875

There are some posibilities to use the push-pin in the mag that follows the last bb. When the Mag is in empty position (even if 2 bb's aren't in the hop-up), this plastic pin is in contact with the top of the inner mag container. If we add "+ / -" contact in the mag weel and on the top of the mag, then the push-pin when empty will connect those 2 electrodes that send and info to the MicroCPU "hey, stop firing, no bb's left!" But we do need the do the mods on each of our mags.

I just opened a mag 1 hour ago and began some drawings. it's just theorical, but logicly doable. I'm not particulary good explaining, but I'll test it in the next days (without MicroCPU). Programming is not my strengh.

If I can, I'll take some pictures of the work.

since its timed. in theory wouldnt it be off time when your battery starts to run low?

The MOSFET? No, it gently vibrates the motor after each shot when the battery gets low. After the battery reaches a certain point, the motor just won't turn over, so as not to strain the battery.

Easier way would be to have reed contacts inside the feed nozzle of the hop-up. When a BB is inside the nozzle, contacts close and gun can fire. No BB means open contacts and gun is shut out from firing. You just need to make sure you use mags that feed fully, and not leave 2 or 3 BBs in the nozzle.

Or you can try installing the contacts as low as possible in the nozzle to make sure they miss those last couple of BBs.

the sw-computer automatically adjusts as the voltage drops.
so the gun will fire slower as the battery gets weaker but you will still get 3 rounds out.

Or I may have another idea, simpler but a little less precise.
For example, I have G3 lows that house 60 rounds eactly each (we can costum modify inside the mag to change the capacity of BBs). the 2 BBs left in the hop-up don't change anything.
If we can say to the Chip
\\\
COUNT 60 rounds fired (cycles) and THEN stop firing
THEN reset IF cocking slide have been engaged (with a micro-switch).

so everytime we empty a mag (60 rnds as example), we can virtualy re-engage chip to fire again...

is it a doable idea?

Really shitty if you do tactical reloads.

we can always recock (reset) even if we shot 30bbs over 60
even if in reality we don't recock if a shell is in chamber

A related idea is to find space inside an AEG's magwell (like, at the top) for a switch which is engaged when a magazine is inserted.

The computer could detect magazine eject/insert. So --- just as an example --- if you had a semi-only gun you could make it stop shooting and require a mag change every 30 shots. (Even though your magazine still has BBs in it, the computer treats it as "empty" after 30 shots).

As a side bonus, it could also use the same switch to prevent firing unless a magazine is inserted.

I recently received the Trigger Master and installed it. I'm totally amaze by the ease of modifying options in advanced mode, quite a nice idea! Thanks DonP. + feedback left

I have 1 question, i read carefully your tutorial and the tutorial in your turorial about coding the Attiny85 with the USB isp programmer. I saw an image on wiring all the connections of the micro-controller but I don't know where to connect the VCC of the USG programmer and do we have to attach a 4.7k resistor on the RESET pin of the ATtiny85? Or it's a Pin to pin connection?

I made the virtual 30-round mag mod I mused about!

Couple things though:

1. The gun will always fire a burst (if you're at 2 rounds left, and you shoot a burst, you'll still shoot a 3 round burst even though you technically only have 2 "rounds" left in the mag.)

2. Why? Cutting off a burst in mid-burst was just too much work to bother programming for this quick mod. :D

3. Rounds fired in fullauto is estimated. It's pretty accurate, but not perfect. It's "good enough" (see #2 above :D )

4. The switch is one that just happens to be big enough to trigger when a mag is inserted. I was really lucky I had one in my junk box. I don't have a specific part number or anything, sorry.

5. Tactical reloads work! (Mag change "resets" to 30 rounds)

6. Gun will not fire without a mag inserted.

http://unconventional-airsoft.com/gf...in-magwell.jpg

Video Download


Splashx: Regarding the programming, see your PM about the same question.