primary winding

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  1. A

    Step Down Center-Tapped Transformer with Asymmetrical Primary Winding Resistance

    Hi everyone, I'm working with a step-down transformer and have encountered a few surprising characteristics in its construction that I would like to understand better. I would really appreciate any insights into why it might be designed this way. Transformer Specifications: Primary Voltage...
  2. M

    HF toroidal transformer - choosing Bpk vs primay turns

    Hello, This is my first time designing a transformer based power supply. I have wound a couple of experimental toroids so far with varying results and am still not sure exactly on how to calculate the number of primary turns. Using a T94-2 core as an example (because I have one sitting...
  3. Jorne

    input resistance of transformer based power supply

    When I measured the input resistance of some 230V AC to 12V DC transformer based power adapters, I got around 400 ohms. Isn't this quite high for the resistance of the primary winding? I expected no more than 100 ohms. The adapters are low power though (output power< 10W). (Background story: I...
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