-15V from a +15 supply

[Dan T]

Hi all, i've got a tripple PSU that gives out +5V, +15V,+15V

I really need one of these outputs to be -15V, is there anyway i can get
this from the supply??? Do i just wire the + to GND, and the -Ve end will
become -15V???

Thanks for help,
Dan

 

[John Fields]

Hi all, i've got a tripple PSU that gives out +5V, +15V,+15V

I really need one of these outputs to be -15V, is there anyway i can get
this from the supply??? Do i just wire the + to GND, and the -Ve end will
become -15V???

 

[Dan T]

eeerr..when i tested it earlier it did seem that the -15V was just floating

 

[Dan T]

its got +15V OP, -15V OP, +5V OP, -5V OP marked up on it

when i refrenece the -15V OP to the -5V OP they seemed to be floating for
some reason.

there isn't any other 0V refrence though.

when i get into work tomorrow i'll make a note of the model number. All i
know at the moment is its a schroff tripple PSU that i don't think is
manufactured any more.

 

[John Fields]

eeerr..when i tested it earlier it did seem that the -15V was just floating

---
Yeah, then, AFAIK no problem!

If you've got a lead which says +15 on it and another which says -15 on
it and you've got 15V between them and neither one of them is connected
to 0V, GND, common, or anything else, then connect +15V to whatever your
0V reference is and the other end will be 15V below that.

 

[Dan T]

Thanks for your help John, much appreciated. - sorry for emailing ur home
address, clicked on wrong reply button.

Dan