driving a transformer with a micro

Discussion in 'General Electronics Chat' started by arudzki, Jul 3, 2012.

  1. arudzki

    Thread Starter New Member

    Sep 25, 2011
    9
    0
    Hello all.

    I'm wondering if it is possible to use a micro to drive a transformer to couple pulsed data across it? If the transformer was center tapped (on the primary side) and the center tap was pulled to some voltage, say 8V through a resistor, and the micro was turning on 2 NPNs (connected to each end of the primary) alternately... so one end would be on, then the other end, at some rate (say 20 Hz, which would indicate a '1').

    Would this work? I'm pretty sure it would, but what would the pitfalls be?

    Thanks
     
  2. Sensacell

    Well-Known Member

    Jun 19, 2012
    1,128
    266
    You will need to watch out for core saturation, make sure the flux can reset by way of drive symmetry.
     
  3. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    5,435
    1,305
    Most micro pins will drive 20mA safely, so you could put the transformer primary between 2 micro pins and add a series resistor so current is 20mA max. Then drive the pins differentially to make AC on the transformer primary.

    A small transformer like an audio coupling transformer or telecoms transformer would probably work ok driven with 5v or 20mA.
     
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