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  1. Replies
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    Sticky: Hi Silvio, I am sorry to say this at this very...

    Hi Silvio, I am sorry to say this at this very late stage but I only just noticed this thread, I am afraid I don't think your PCB meets the creepage and clearance requirements of CE, In fact as far...
  2. Replicateing integrated circuits using discreets......comments ?

    Hi All

    I have an interesting question, would you replicate an integrated circuit with perhaps 30-50 transistors in discreets and if so why ?

    Would it be for the theoretical challenge ?
    Would...
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    Hi Silvio, my I wonder how many times I will get...

    Hi Silvio, my I wonder how many times I will get timed out on such a long post hehehe
    OK the TIW wire is simple, have a look here http://www.tex-e.com/product/texe_feature.htm
    Maximum flux density...
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    Hi Silvio, I always get timed out when writing...

    Hi Silvio, I always get timed out when writing replies here it seems rather short or maybe I am just slow :)
    I noticed in transformer construction people use 2 or 3mm wide end spacers to force the...
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    Well I got it working, seems I got in a tangle by...

    Well I got it working, seems I got in a tangle by using the draft button and assumed that would allow me back to finish/edit it but seems not!
    Anyway just go for a straight publish and add the...
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    Hi Silvio, Wowwww amazing!!!! you are so...

    Hi Silvio, Wowwww amazing!!!! you are so dedicated! I have made litz in 0.4mm for example just 7 strands but not real rope like you are making that's simply amazing to me. Even with 7 strands I find...
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    Blog was great.........for a moment!!

    Well it let me create it BUT, wont let me edit it, wont let me comment on it, wont let me add to it and most of all wont let me post pictures to it!!

    Obviously operator error but certainly not...
  8. Thread: First smps

    by fourtytwo
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    There I have to agree with you, however I myself...

    There I have to agree with you, however I myself have failed to suffer this malaise in any noticeable way! I guess my transformers are conservative on flux density by allowing for a high mains that...
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    Hi Silvio, I am sorry I was late to the thread, I...

    Hi Silvio, I am sorry I was late to the thread, I didnt realize you had already solved your problem, nice work :) Nice 1Kw psu too but am a bit foxed by the control chip but I understand this is a...
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    Hi Silvio, nice transformer, how many va ? Does...

    Hi Silvio, nice transformer, how many va ? Does it actually trip your breaker ?
    Myself I use a 500W EI core isolater in combination with a variac just for the smps I am working on, not the whole...
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    My pleasure just didnt want the poor guy to blow...

    My pleasure just didnt want the poor guy to blow his MOSFETS and potentially control circuit!

    So this is a ~300W psu a bit beyond the simple one chip flybacks, a half bridge is a good choice as...
  12. Thread: First smps

    by fourtytwo
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    Have you worked out the delay time between an...

    Have you worked out the delay time between an overcurrent and shutdown of the mosfets ? have you considered what effect this will have on the actual drain current at the time of turn off ? Why are...
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    I am sorry you are completely wrong!! Ignore the...

    I am sorry you are completely wrong!! Ignore the center tap. The MOSFETS are in series across the full supply voltage e.g. 371VDC, whenever either MOSFET is turned on, the other sees the full supply...
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    Just to clarify in a half bridge the switch...

    Just to clarify in a half bridge the switch devices both see the full input voltage or 371Vdc in this case. It is the transformer winding that only sees half the input voltage minus any center tap...
  15. Thread: First smps

    by fourtytwo
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    Yes exactly but you could just use a pot & no...

    Yes exactly but you could just use a pot & no comparator to tune out the manufacturing range of the chips shutdown sense voltage. Of course what you really want is current mode controller in the...
  16. Thread: First smps

    by fourtytwo
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    My first reply was lost so I hope this makes...

    My first reply was lost so I hope this makes sense re-written from memory!

    The major difference is in distribution of ripple currents and that is dependent upon ESR of all the components involved...
  17. Thread: First smps

    by fourtytwo
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    Good you are familiar with LTspice, a very useful...

    Good you are familiar with LTspice, a very useful tool. Then I suggest you throw a short on the output just as the high side starts conducting and see what happens :) maybe your book doesn't entirely...
  18. Thread: First smps

    by fourtytwo
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    Hi Brady, great effort here! My experience is...

    Hi Brady, great effort here! My experience is high voltage SMPS have a nasty habit of blowing up under abnormal conditions so I do a bit of extra work to try and make them more robust.

    I notice...
  19. Its hard to help with so little information! your...

    Its hard to help with so little information! your gate diodes seem the wrong way around as its normally required to slow down turn-on and speed up turn-off. You say nothing of your transformer...
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    junk, no current control!

    junk, no current control!
  21. Hi, I think you made mistake with point C, it...

    Hi, I think you made mistake with point C, it seems to be capacitive centre tap, not output ?
    In any case why does your power supply not have inductor on output ?
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