Whats the difference between VBat and Vbt terminals on the Matek H743 Slim?
My Matek takes power from the plug and harness that go back to the ESC. I’m wondering if I can use VBat or Vbt to power my Air Unit and camera gimbals to avoid having to fit distribution board or having some wires go back to the flight controller and some back to the ESC for power.
Thank you
PS. Matek website has been down for weeks. If anyone has a copy of the H743 Slim PDF, would you share it ?
Vbt is Vbat after some filtering, and I guess by design You can select it as power for Vsw - switchable power output for VTX (or something else).
VBat should be the input put for battery voltage for power monitoring.
Jump the Vbt pads as @Adam_Borowski shows to use the Vsw for your VTX. I use the same function on the H743-Wlite to turn off my walksnail VTX when I’m powering up on the ground so it doesn’t overheat.
I don’t have the slim manual, but here’s the Wlite manual. Proton Drive They have the same Ardupilot target so the setup for the Vsw should be the same.
Thanks. It looks like my Gimbal isnt agreeing with VBt, even though it only draws 100mA it causes the Matek H743 to restart over and over. Some sort of initial power surge I guess.
It states that only 1A allowed on vsw pad
Can you leave the gimbal powered and only shut down the VTX?
I’m using a DJI Air Unit which doubles up as receiver, so remote shut down would create a silly loop.
I’m going to solder some JST power connectors to the ESC, it’s an extra set of connectors I wanted to avoid but as I say, the gimbal is causing some strange behaviour.
Yeah, I guess you don’t want to shut that down.
Generally I’ve found the Vsw (and power regulation in general) on the matek boards to be reliable. So if the gimbal is causing it to power cycle or brown out like that, maybe have a good look at everything to make sure something else isn’t going on. Or if you can put a multi-meter in there make sure the gimbal isn’t overloading during start up.
I’m such an idiot…. my power supply was set to current limiting and was causing the voltage to lower. Symptoms gone. I’ll leave the air unit and gimbal powered off the ESC as it’s done now and probably safer.
Don’t be too hard on yourself. I have it on really good authority that you’re not the first and only person on this forum (or in this thread) to make that mistake. 
