9v is already a bit much As the two wires are solders to the pins of a capacator as these where the easiest to reach. I can’t remember the rating of it, it’s written on there. If the voltage is to high it will pop ( as it might have done allready with the smoke ) But as the rest of the system doesn’t ...

I haven’t found it unfortunately
Have measured multiple points but haven’t found other than 5v and 3.3v if i remember correctly

Sucks that you might have smoked it
Hope it’s not that damaged

I have not tried it but I am afraid there not usable anymore unfortunately im unable to test is as the unit is build in my door opening system and hard to take out

The 5V isn't measured on the Relay pins (L1 and L2 Contact) anymore as it was with the 230v It's most properly because the 230v part of the module is skipped. So yeah it switches low voltage perfectly :) no extra voltage shown on my MultiMeter. Measured the 5v Part of the print when attaching a load ...

Hi I'm New here but saw the Potential free problem I too was having and have found a solution that works for me. I use some Aqara LLKZMK11LM modules and those are NOT potential free without the Red Wire unfortunatelly. As my intention was to use it to open my Frontdoor StrikeLock running on 12Vac ...