Yeah ok. Been having a lot of fun with my son’s vector. Cooked three mosfet boards. Mistakes made and lessons learned.
When changing motor, don’t assume the factory put the red wire on the positive pole of the motor - check! This vector came with white wire soldered to the Mot+ and red wire to Mot- which caused some instant smoke when I copied how it was done. After close inspection I realised there is microprinting on the circuit board and the second mosfet board was wired to the new motor correctly.
Next mistake: motor selection. A chihai red 11.1V vector motor with 11.1V battery and 1.3 spring is too much for the green mosfet board. It worked for about 1.5 seconds and died. Tried again with the spring out and no load same configuration, it ran a bit longer but cooked itself very quickly.
New strategy. Acquired purple chihai 8.4v motor. Had to do some surgery to get the pinion gear to mesh with the crown gear. Ground the flat on the motor shaft about 3mm closer to the motor, tapped the pinion gear down and trimmed the shaft. Put it all back together after dry firing. Mag feed works but no motor.
Disheartened, pulled it apart again and carefully inspected everything and found that the spade connector on the top of the motor had cracked and broken after bending it to get the wires to sit nicely. Raid the spares bin, solder a new negative wire on the mosfet board and refit to motor. Motor runs again. Reassemble the blaster carefully with original spring. Blaster fires nicely.
Several tests later the mosfet board is getting warm after a few minutes of burst fire. Put a magazine through it and it’s still working. Avoiding full auto for more than two or three seconds.
This blaster has metal 18:1 gears, bruisemaster tight bore 24cm barrel, 80% stainless cylinder, nylon piston with metal teeth, original tee piece, green oring, 1.3 spring, slimline hopup, 11.1v battery and purple chihai motor.
It works but I’m not confident it will last long. Have ordered an easy fet v2 and will try and combine it with the green board or else forget the fire modes and just run with the easy fet.
I’m going to go back to my acr build now. For some reason it’s soooo much easier to work on than the vector.
One of these days I’ll have a closer look at these mosfets and see if they can be tweaked a bit. Be interested if there’s any other electronics nerds out there who have similar ideas.