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Connecting two separate battery negatives together ???

Discussion in 'General Electronics Discussion' started by collectors, Oct 12, 2021.

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  1. collectors

    collectors

    2
    0
    Oct 12, 2021
    Hi, i have an RC receiver board & a FET buffer board / switch. Both boards have a separate battery supply. 1 is 12v & the other is 6v. It says connect both battery's on the negative side. Is this OK?, or do i need to separate some how. Thanks
     

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  2. bertus

    bertus Moderator

    2,058
    777
    Nov 8, 2019
    Hello,

    Do you have details on the fet board?
    Wich other boards do you have?
    You can connect all negative lines together.

    Bertus
     
  3. collectors

    collectors

    2
    0
    Oct 12, 2021
    Hi, its all for an RC model train & i have a receiver fitted to the train with spare "2 low outputs & 1 high output". It was said to connect the FET to the low output so i could switch some lights as the low outputs on the receiver are not strong enough to do this. I might even have the FET switching a relay depending on how many lights..
     
  4. bertus

    bertus Moderator

    2,058
    777
    Nov 8, 2019
    Hello,

    Do you have details on the receiver, as I do not understand the "2 low ouputs and 1 high output" statement?
    A datasheet would very much help.

    Bertus
     
  5. Harald Kapp

    Harald Kapp Moderator Moderator

    11,702
    2,717
    Nov 17, 2011
    You must connect the battery negatives together to create a common reference potential. If you don't do this, your receiver's output (connected to the driver's input) will be floating, there will be no path for current from the receiver to flow into the driver and back to the receiver. This will lead to non-predictable, erratic behavior of the whole circuit.
     
    collectors likes this.
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