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  1. @Hesamavr This looks like a very nice project...

    @Hesamavr

    This looks like a very nice project and the smps seems very stable and looks that it works fine. However if it had to be capable of delivering around 3 Amps of current it will be more...
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    Sticky: You may probably having a ground loop. Make a...

    You may probably having a ground loop. Make a star ground on the amplifier chassis and ground all your ground points to it. That is the preamp the the power supply ground and the amplifier ground. ...
  3. Thread: EER43 Windings

    by Silvio
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    7191 Here is my idea for you. I just noticed...

    7191

    Here is my idea for you. I just noticed I made a small mistake the output voltage should read 16v and not 50v I was considering 50 Amperes not volts when I wrote 50v.
  4. Thread: EER43 Windings

    by Silvio
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    @SMLinear. Well I gave things another taught...

    @SMLinear.

    Well I gave things another taught and you might use two of your EER43 cores. These cores can readily supply more than 600w each at 20Khz. It is important that they be of the same...
  5. Thread: EER43 Windings

    by Silvio
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    Hello SMLinear, I am not sure from your post...

    Hello SMLinear,

    I am not sure from your post if you have ever built a SMPS before, I can see you are in for quite a task especially with the current involved in your PS. Having 12v@ 100A at the...
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    I took a look at the data sheet and yes in fact...

    I took a look at the data sheet and yes in fact you should be having around 70khz. You should try to measure frequency during load as due to the green mode operation at low power consumption the...
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    Can you post a schematic of the flyback...

    Can you post a schematic of the flyback converter?
    Tell us also the frequency of operation and details of the trafo and windings.
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    I think you are referring for the snubber across...

    I think you are referring for the snubber across the primary winding. This is there to suppress any spikes generated during switch off of every cycle. Through my experience When a transformer does...
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    At the current of 20A these effects will surely...

    At the current of 20A these effects will surely come out and that is the reason of the extreme heat. I suggest you wrap 4 wires at a time and make 6 bundles. If you have a copper sheet it will be...
  10. Thread: SMPS with PFC

    by Silvio
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    I guess you want to check the schematic for any...

    I guess you want to check the schematic for any errors correct? If that is so please post a larger image of the schematic as it is too small to see it
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    The wire for secondary with 22 wires 0.55mm can...

    The wire for secondary with 22 wires 0.55mm can surely carry the 20 amps needed. I am assuming that the winding get hot during a load of 20 amps. I do not know if you want this smps to work 100%...
  12. This is a two switch converter to my believe it...

    This is a two switch converter to my believe it is very immune to shoot trough. Your problem is very odd. It would be of much help if you could post some oscilloscope shots at least at idle. without...
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    Sticky: To check the dead time you need to take out the...

    To check the dead time you need to take out the cursors and put the waves on top of each other. You will notice that one wave has a shorter pulse width than the other. You need to measure that...
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    Sticky: @ Marshall. The wave forms look good I guess...

    @ Marshall. The wave forms look good I guess these are the low and high side being read together.
  15. @ Kees54, Try this Resonant smps design it may...

    @ Kees54, Try this Resonant smps design it may help you out. This is only designed for smps up to 700w

    Link ...
  16. Have you tried Elektrotanya? Try this link ...

    Have you tried Elektrotanya?

    Try this link ...
  17. [QUOTE=nhatspkt;16244]Can you give me some advice...

    [QUOTE=nhatspkt;16244]Can you give me some advice how to calculate flyback tranformer and select Bmax, D ?[/LinQUOTE]

    Here is some software that you can download and this will calculate...
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    Have you tried a larger output capacitor? For...

    Have you tried a larger output capacitor? For the output you need to put a light load for the output voltage to settle quicker.
  19. From what I am assuming is that not everybody has...

    From what I am assuming is that not everybody has the means of making a gap in a standard non gap core. From what I am thinking is that he is preferring to use a standard gapped core with the...
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    Sticky: Here you have a link and you find all the details...

    Here you have a link and you find all the details you want. If you want a lower voltage other than 12v just change the zener diode to the required voltage.
    ...
  21. So sorry I did not notice you already posted them...

    So sorry I did not notice you already posted them :D :D
  22. Hi Stewin could you post a PDF file so that we...

    Hi Stewin could you post a PDF file so that we have a more clear schematic and pcb layout?

    Thanks and regards Silvio
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    Sticky: RT resistor for timing should be in the region...

    RT resistor for timing should be in the region between 8k and 12k However it also depend on the exact value of the timing capacitor. The frequency may vary a little. You can solder a variable...
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    Sticky: Hello rinchz, I am assuming you are using...

    Hello rinchz, I am assuming you are using IRFP460 for switching the half bridge and the calculation is for 80-0-80 peak at 240v input.
    With the mosfets mentioned you will get a peak power of 1200w....
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    Hello xisto, regarding repairs on amplifiers it...

    Hello xisto, regarding repairs on amplifiers it is always a must to put a series 100w lamp at least if you have a short circuit somewhere it will limit the current. At times a fuse is found after...
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