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What devices should i look for to get a -30V power supply. (lemmy.ml)

submitted 4 months ago by montar@lemmy.ml to c/askelectronics@discuss.tchncs.de

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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.

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[–] bitfucker@programming.dev 2 points 4 months ago (1 children)

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.works 1 points 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.