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Different 12v DC power sources

Discussion in 'General Electronics Discussion' started by Mark80, Sep 6, 2017.

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  1. Mark80

    Mark80

    15
    0
    Sep 15, 2016
    Hi,

    Can a 12v+ dc circuit return to the 12v- of a different 12vdc power supply?

    e.g.: (Transformer A) 12 v+ --------- light --------- 12 v- (Transformer B)
     
  2. BobK

    BobK

    7,682
    1,688
    Jan 5, 2010
    No. If there is no other connection between the two transformers, no current can flow.

    If the two have a common ground, and if that was the - of the first transformer and the + of the second, you would have 24V on the light. If the two minuses are connected together it will work, but what is the point of the question then since the light would be connected between the + and - of the first transformer.

    Bob
     
    Mark80 likes this.
  3. Mark80

    Mark80

    15
    0
    Sep 15, 2016
    Thanks - I had a feeling this would be the issue.
     
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