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  1. smps ic

    data sheet of JZ6120BD used in atx power supply required
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  2. smps ic

    data sheet of JZ6120BD used in atx power supply required
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  3. First attempt of TD Class on Leco Amplifier Module

    Quote Originally Posted by fitzroy View Post
    Quote Originally Posted by fitzroy View Post
    add 39k resistor from pin 1 to pin 3 of negative pwmpatd circuit i posted
    Click image for larger version. 

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ID:	6914 negative pwm circuit
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  4. Current transformer calculation

    To determine how to calculate the number of turns according to the current handling for a SMPS.

    1) Determine the voltage needed for sensing and add 1 diode forward voltage in a centre tapped configuration, or 2 diode
    forward voltage drop for a single secondary winding with a bridge rectifier.

    2) Calculate the peak current for the SMPS in the primary winding.
    3) Determine the turns ratio for the current transformer. Please note that the ...
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  5. Identifying fake fets and genuine ones

    Here is a short video that describe how to identify fake mosfets with genuine ones.
    Recently I was experimenting with a SMPS and decided to buy some cheap fets from the internet. I do not remember exactly if it was from E-Bay or Aliexpress but however when I tried these IRF740 they where giving up at around 1/3 of the specified load they should handle.

    The video link shows a simple test that I made and shows what to look for.

    https://www.youtube.com/watch?v=gRRfb5YxvIA
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