Transformer secondary grounding

Discussion in 'General Electronics Chat' started by arudzki, Jul 2, 2012.

  1. arudzki

    Thread Starter New Member

    Sep 25, 2011
    I have a question regarding a circuit containing a transformer. I'm thinking of driving a transformer using a microcontroller and transformer driver circuitry to pulse "data" on a wire. On the secondary side of the transformer, there are 2 wires. One of the wires is connected to the output to carry the data. Can the second wire from the transformer secondary be grounded? Would this work and how does it affect the data wire?

    thanks for any help

  2. #12


    Nov 30, 2010
    Voltage is always a voltage compared to some other place. The 2 wires on the output of a transformer satisfy that requirement. The voltage on one wire is a voltage compared to the other wire. Meanwhile, the voltage on one wire means nothing compared to any other place. Only when you connect both wires can you get your information (or energy) to operate properly. Electronics people generally "ground" one wire because the other wire will then contain voltage compared to a common point that they are using anyway. If you don't connect the second wire someplace, the first wire contains nothing you can use.