Please explain this smps operation

Discussion in 'General Electronics Chat' started by Mrdouble, Sep 10, 2012.

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  1. Mrdouble

    Thread Starter Member

    Aug 13, 2012
    I found an old instrument with the schematic in the leather sleeve
    It's a low voltage generator (1v and lower). Anyways, it doesn't work but the power section does so I'm gonna use it in a project. Im having a heck of time understanding how this works. Looks like the pair of transistors are cycling on and off but I dont see how the two windings on the primary side do whatever they do in the secondary. Please explain

    Also, I had to substitute the transistors with tip41c , I don't think this makes alto of difference but the output is way higher than what's on the print. I'm wondering if the circuit needs to be loaded to get appropriate voltages on the output

    Thank you
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
    Duplicate thread. Answer in the other one.
  3. bertus


    Apr 5, 2008
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