As the reverse motion still works, could I use a voltmeter while the truck is running backward motion and measure the voltage on the good transistors still working? As everything seems so complicated I might just end replacing the burnt transistor with a new same one and just run stock 9.6v packs..
That is a P-channel mosfet. The gate threshold voltage (Vgs) can be just -2V (range: -2V to -4V), so with a 12V battery, he will need a gate voltage relative to ground/common of 10V or so to be sure it is off.
Also, the voltage at the transistor base is likely PWM'd, so a simple voltmeter won't give the peak value, unless it is at 100%..
What about using those low opening voltage mosfet? and as I have currently two bipolar regular PNP and two NPN so 4 in total how many mosfet would I need P or N channel?
I was running some tests switching the standard 9.6V battery packs to lipo 3S , Over the 5cars tested one came to a dead stop after less then 50m..leaving the car without forward motion, electronics smelled burnt. Opened the car and nothing seemed suspect despite the burnt smell. The power transistors are the square flat with 3 legs screwed on a heat sink ( and by the way I'm surprised how fast this forward transistor burnt despite the heatsink!) ,refs are : Two are C3420 031 and two others A1357 031, Could you guys help me identify those transistors and maybe tell me which ones could replace those for higher performance ?
Some people tell me that if the actual bard has not been designed for power mosfets then it will not work? I'm kind of lost..Or should I use just more powerful transistors, a step better then the ones I have now and go with the exact same pnp, npn?
What about using those low opening voltage mosfet? and as I have currently two bipolar regular PNP and two NPN so 4 in total how many mosfet would I need P or N channel?
yes I think I will just put regular pnp /npn transistors but at least the most powerful ones .. any precise model you guys know?? And as for heatsink, the actual ones that burnt up in no time had already good heatsinks..