I’ve got a VFD display on board along with UPD16311 driver is made for negative voltage around -30V and i think so is display (i couldn’t find any info on display) and I’m doing it mostly from junk parts. I want to know what devices could/should contain power supply for such voltage. I’ve tried -12V from psu i’ve got lying around but it didn’t work. There’s also a chance that display itself is damaged but there’s no visual sign of it.

  • bitfuckerEnglish
    2·
    5 months ago

    It would be weird for say, a 12V-2A PSU to not be able to source and sink 2A. The current direction didn’t change from the PSU perspective, only from the load. If you have multi-rail power supply, then yeah it may have different source-sink capabilities for different rail

    • Kalcifer@sh.itjust.worksEnglish
      1·
      3 months ago

      The current direction didn’t change from the PSU perspective, only from the load.

      You are absolutely right. I don’t know why I was thinking the direction changed.