Author Topic: EEV Power Supply and floating ground  (Read 2099 times)

0 Members and 1 Guest are viewing this topic.

Offline joegtp

  • Contributor
  • Posts: 30
EEV Power Supply and floating ground
« on: April 03, 2012, 02:58:23 pm »
I'm building up Dave's power supply but I want to have it plugged in instead of battery powered. What is the best way to get the outputs floating? Are those cheap wall wart power supplies floating usually?
 

Online firewalker

  • Super Contributor
  • ***
  • Posts: 2368
  • Country: gr
Re: EEV Power Supply and floating ground
« Reply #1 on: April 03, 2012, 03:24:24 pm »
If it uses a simple transformer yes. I would choose a transformer one to avoid any noise of a switching one.

Alexander.
Become a realist, stay a dreamer.

 

Offline amspire

  • Super Contributor
  • ***
  • Posts: 3787
  • Country: au
Re: EEV Power Supply and floating ground
« Reply #2 on: April 03, 2012, 03:42:50 pm »
You still need the switching pre-regulator from Dave's RevC circuit if you want a full 20V 1A output.

If you are going back to a heatsink + fully linear regulator, you will probably have to make the supply 0-10V @ 1A or 0-20V  @ 0.5A.

Richard.

 

Offline gxti

  • Frequent Contributor
  • **
  • Posts: 507
  • Country: us
Re: EEV Power Supply and floating ground
« Reply #3 on: April 03, 2012, 05:47:42 pm »
Any safe mains supply is intrinsically isolated. It's just that sometimes one output, usually the negative one, is then tied to earth to keep the output from floating. If your wall wart does not have an earth connection then it will (hopefully!) be floating.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf