I’m using an aluminium heatsink with a nonconductive thermal pad between. I suppose under clamping force the thermal pad could be squeezed out of the gap, but it worked fine at low current at first. Perhaps I got some dud FETs? they were cheap off aliexpress
I put a kapton tape on the heatsink, then 0.5mm thermal pad, just in case the back of the FET should go through the pad. The Kapton is only 0.05mm thick so it should not add to much thermal isolation. If you screw your FETs onto the heatsink you also need to isolate the screws from the case, at least if you use FETs with to220 package . There are special plastic shims to put between the screws and the to220 screw hole.
Use the what?
Never trust aliexpress mosfets 
1 Like
From what store did you order? I got some cheap fets from there too, need to check them when they arrive..
Lcsc
I got them from Shop1104385434 Store on aliexpress. They have about 5% of reviews accusing them of counterfeiting. I think this would be the problem. I don’t have a transistor tester but will try ordering some others.
No thanx
I need to figure out how to turn on 2 fockings with one button, with one NO contacts.
Same here, mine did not arrive yet. Lets do some testing, do you have the same model from a different source by any chance?
I’ve ordered some from LCSC electronics which I believe is reputable. When they arrive in 2 weeks I will try them on a new board.
1 Like
What kind of button? Will the ESCs be under vibration during use?
This one Push button.
Ofc it will be. I am using it in escooter.
It doesn’t look like using a SPDT momentary switch like that will work. You need to use a loopkey, or a separate antispark power control unit with that switch, or modify the design yourself to support that.
There is input for momentary switch on dc-dc board. But i want to switch both of the controllers with one switch. In worst case, i can desolder one dcdc board and power both of the controllers from one.
Connect Left ESC switch connector pin 1 (square pad) to Right ESC switch connector pin 1 (square pad) through a 75K resistor.
Can someone with CRST030N10N from a reputable source like LCSC do some measurements, capacitence with a multimeter or if you have one of those cheap transistor tester:
I’ve designed a alu pcb for the mosfets, cooling will be dramatically improved. Building a alu controller now
I will test it, thank you.
You know the mosfets tabs cant be connected?