Tweakers' Asylum

Thanks, CJ

150.148.218.190

Lew

In Reply to: RE: Yes, as long as they all share the same common reference ground. (nt) posted by cheap-Jack on October 31, 2007 at 09:15:31

Yes, the cdp circuitry does share the same common ground. That's why I had to doubt my first instinct, which was to attach the -12V output to ground and the common center tap to hot, so as to deliver +12V wrt ground to the second target. Since I am going to attach the common center output of the Calex supply to ground when I feed the clock, it did not make sense to treat the -12V output in that manner. (I hope these sentences make some kind of sense.)

Follow Ups:

RE: Thanks, CJ - beermanpete@socal.rr.com 20:29:57 10/31/07 (4)
This smells like a problem. The output from the unused tap (-12V) is negative with respect to ground. I get the feeling from your comments that the intended load requires positive voltage. If so you will have problem, the least of which is a non-functional circuit. It could damage something.

Be careful.
- RE: Thanks, CJ - Lew 20:43:57 10/31/07 (3)
  Just what I fear. I think I am trying to get someone to tell me that what I feel in my bones is wrong will actually work, to justify what I thought was a great idea for about 10 minutes. Gotta find out whether the other circuit can handle -12VDC instead of +12VDC, and it probably cannot.
  - RE: Thanks, CJ - Ugly 12:49:28 11/01/07 (0)
    If 12VDC load A were galvanically isolated from 12VDC load B and load B was galvanically isolated from earth gnd and there was no plan to electrically interface between the two then you could wire as follows: +12 to Load A hot lead, Gnd to load A hot lead, Gnd to Load B hot lead, -12 to load B minus lead.
    
    However, as soon as the two share signal lines or Load B is somehow earth referenced the potential for something to fry or explode goes through the roof.
  - Post the schematic so I can comment further. (nt) - cheap-Jack 07:15:20 11/01/07 (1)
    .
    - RE: Post the schematic so I can comment further. (nt) - beermanpete@socal.rr.com 21:40:27 11/01/07 (0)
      What else is there to say?

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