A
Abstract Dissonance
- Jan 1, 1970
- 0
I'm building a PSU and I've got a 40VCT @.25A transformer. I want to have
two outputs of +V1 and -V2 volts... i.e., two outputs that are adjustable.
I've done it for the +V already using the LM317T and a circuit that they
have in there data sheet... I get from 1.25 to 30V...
I'm curious though as when I do it for the negative supply(V2) if I could
take the ground as V2 and the "hot" as V1 so I'd get V1-V2 = V1+|V2| to get
a new voltage(which would ~= 2*30)? or, say, if I needed two positive
"hots"(not sure what to call them) could I just reverse the ground the
V2(i.e., swaping ground and V2 "behind the scenes"(well, lets say with a
toggle switch)) or does this cause problems?
i.e., I'd like to get the most out of my psu but I'm not quite sure what I
can do... right now I just have some voltage regulators(LM317 and some fixed
ones).
One more thing... I was messing around monitoring the voltage and the
output(of the regulator) seemed to fluxuate with 1/100th of a volt or 2 and
at some points it was about 1/2 a volt or so. Is this normal? (I wasn't able
to monitor the input voltage at the same but it seems to fluxuate too).
Thanks,
Jon
two outputs of +V1 and -V2 volts... i.e., two outputs that are adjustable.
I've done it for the +V already using the LM317T and a circuit that they
have in there data sheet... I get from 1.25 to 30V...
I'm curious though as when I do it for the negative supply(V2) if I could
take the ground as V2 and the "hot" as V1 so I'd get V1-V2 = V1+|V2| to get
a new voltage(which would ~= 2*30)? or, say, if I needed two positive
"hots"(not sure what to call them) could I just reverse the ground the
V2(i.e., swaping ground and V2 "behind the scenes"(well, lets say with a
toggle switch)) or does this cause problems?
i.e., I'd like to get the most out of my psu but I'm not quite sure what I
can do... right now I just have some voltage regulators(LM317 and some fixed
ones).
One more thing... I was messing around monitoring the voltage and the
output(of the regulator) seemed to fluxuate with 1/100th of a volt or 2 and
at some points it was about 1/2 a volt or so. Is this normal? (I wasn't able
to monitor the input voltage at the same but it seems to fluxuate too).
Thanks,
Jon