Im totally lost here. I am going to use the 12V from the V2 output from the power supply in the image. But where do I connect the black wire for ground? There´s no V- on this power supply as I thought would be where I attach it.
Probably COM (short for common) but since you've given no details about your power supply that can only be a guess. A link to the specification of the PSU would clear it up.
If you have a DMM to measure the voltages then you can work it out yourself in a few seconds.
Steve
Sorry. Here´s the specs: https://www.electrokit.com/uploads/productfile/41014/rd35a.pdf
So as the block diagram shows, COM it is.
Steve
Thanks! That worked a charm!
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