Recent content by liviu

  1. L

    Flyback uc3845 transformer core hating up.

    Your calculated frequency = 78 kHz. UC3845 is "50%" duty cycle. Output frequency in this case is 78/2=39 kHz. Use in Flyback 6000 40kHz
  2. L

    Calculation programs for transformers and inductors

    In Flyback 6100 for RCD clamper having two resistor values: For "slow" diode (FR207) and for fast diode. FR207 having trr=500ns UF4007 or BYV26 E having 75 ns. Where is the limit between "slow" and "fast" here? B.e. having 10nF and 23.6 kOhm / 1.2W for slow diode and 10nF and 5.71 kOhm /...
  3. L

    Calculation programs for transformers and inductors

    Thank you very much! I will follow for sure.
  4. L

    Calculation programs for transformers and inductors

    Thank you for your answer. In post #133 i wrote "FlybackZVC" used. L is depending with N^2, right? So, if you for 40 turns =>5.6mH will have: 100/40=2.5 times my turns versus ATX turns. 2.5*2.5=6.25 times my L big like ATX L My L=5.6 * 6.25 = 35mH (my L is only 25 mH, so i not make mistakes...
  5. L

    Calculation programs for transformers and inductors

    Yes, is OK. UniT UT58 series and work well. Measured known inductances and my instrument work well I tried make another trafo on ER35/16/11 !!! (Yes, atipic dimensions) (from ATX too) and without gap 9mH. maybe another material? Not 3C90? Remember, China cheap ATX.
  6. L

    Calculation programs for transformers and inductors

    Used one of your programs for calculate a flyback trafo In fact Flyback ZCS 2000. OK, for EI33 3C90 result 80 turns 0.4mm Lp=1.47mH 1.2 choosed gap. In fact i tried to make trafo and after finish L=20mH!!! E+I from an ATC source (recovered) Tried use gap and 0.65 mm spacers (trat mean...
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