Need Very clean Linear +15V -15V and +5V with common ground

[digi001]

Im looking for about 1A @ +-15V and 500mA @ +5V. What would be the problem with just hooking up 3 wall warts, putting all the grounds together?

2x P48151000A020G: AULT INC.: Power Supplies & Wall Adapters
1x DV-580R: JAMECO RELIAPRO: Power Supplies & Wall Adapters

---------- Post added at 14:33 ---------- Previous post was at 14:31 ----------

I guess the above solution wouldn't provide any protections or controlled startup conditions a nice Triple output supply would?

 

[chuckey]

You get what you pay for (if you are lucky). You say "very clean" at $8 ??? you could have a measure of start up control by having a relay powered by one line switching the other lines on, or even two relays, so +5 first, then + 12V then - 12V.
Frank

 

[digi001]

well if its linear (wall wort = transformer and 2 diodes) it should at least be clean? Ripple might not be so great, but no high frequency noise.

 

[greentree]

Hi
If you will low current its easy.
you can use lm7815 & lm7915 & lm7805 .
but for more currents i suggest you to use smps such az lm2576 series.(3amp)
and for currents more than this you can the other smps circuits such a buck,boost, flyback ,forward ...

Best wishes
Green tree

 

[Syncopator]

Im looking for about 1A @ +-15V and 500mA @ +5V. What would be the problem with just hooking up 3 wall warts, putting all the grounds together?

No basic problem. But you should choose regulated ones. If you draw less than the maximum rated current from an unregulated wall wart the output voltage will be higher than the stated figure.

I guess the above solution wouldn't provide any protections or controlled startup conditions a nice Triple output supply would?

No.

 

[digi001]

No.

Im talking about SCR crow bars and extra protection for sequencing of power. If you tie 3 wall warts together they will not have this type of feature.