Recent content by hanair

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    Short-circuited my brand new SMPS :-(

    Edit: This was not an issue. I had my multi-meter in AC mode like I would test a transformer! I just received my SMPS from AliExpress and while trying to check the voltage its output got short-circuited accidentally. This model is very popular in ebay and AliExpress, and attached is its...
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    120v SMPS without using input voltage doubler

    I just built my first SMPS to convert 120v to 45-0-45v for my audio amplifier. It works fine and I tested it with 100w 110v Incandescent bulb. it is based on the standard IR2143 circuit (EI33 core with 20+20 turns primary and 12+12 turns secondary). The oscillator is running at about 50 kHz. The...
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    Best ferrite core and its source

    What is the best ferrite core for medium power SMPS, 100-300W - mainly for audio amplifier purposes? I was looking at EI-33 and came across the following seller: http://www.aliexpress.com/item/Ferrite-core-station-type-bobbin-transformer-pc40ei33-thermal-whosalesale-50ses-lot/559078667.html Do...
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