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Thread: Cheap smps base on TL494 pwm, half bridge AC-DC

  1. #1
    diysmps Senior Member
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    Cheap smps base on TL494 pwm, half bridge AC-DC

    Hi all,

    Im Nor Azmi from Malaysia, here i will share something regarding smps using TL494 chip and trafo drive r EE16 ( u can take it out from PC PSU ), i think it would be cheap to build and with easy parts. Owner of this creator from Forosdelectronica website claims that it can deliver at least 300 watts, i dont know if it can take more power, maybe some of us here willing to help, im gonna setup this one and let you all know the progress.

    here is the schematic.
    Attached Files Attached Files

  2. #2
    diysmps Senior Member
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    Windind trafo: EI33

    Primary : 26 laps ( 13 +13)
    Secondary : 22 laps ( 11+11)
    secondary for 15 volt : 4 + 4 laps

    inductor : 40 laps x 2

    for the driver u can use from old pc supply, i`ll take some picture here the core name is EE16, must watch the trafo leg combination and i`ll explain. hope we can share together.
    Last edited by norazmi; 12-28-2011 at 05:34 PM.

  3. #3
    diysmps Senior Member
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    this is PCB ready to etch, enjoy.
    Attached Files Attached Files

  4. #4
    diysmps Senior Member
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    i`ll start build this baby on 3rd jan, because some of part not arrive yet and i lost my drilling machine, lol, tomorrow i`ll buy new one.

  5. #5
    very good start
    www.diysmps.com & www.Micro-Audio.com

  6. #6
    diysmps Senior Member
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    ive got my drill yesterday, buy new one hehehehe, so i`ll start today for this project

  7. #7
    diysmps Member tebci's Avatar
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    Quote Originally Posted by norazmi View Post
    ive got my drill yesterday, buy new one hehehehe, so i`ll start today for this project
    You will show how to wind transformer?

    This is very good project for DIY like me who cant get ETD transformer to make the SMPS, I think many people will make this SMPS is you show success. and me will be first one

  8. #8
    diysmps Senior Member
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    tebci, yes, i`ll show it. for EE16 u can just take it out from old psu. i`ll show the leg combination for EE16 core, how to connect it to the board, for the main trafo also i`ll show it here and we can share with others, and will discuss more about it. Thanks.

  9. #9
    diysmps Senior Member
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    Main trafo winding info:

    for the winding instruction i already mention above, and this is the drawing.

    primary winding, "m" to "n" 13 laps, and "n" to "o" 13 laps,

    secondary , "q" to "r" 11 laps and "r" to "s" 11 laps.

    third secondary, 4+4 laps "t" to "u"
    Attached Images Attached Images
    Last edited by norazmi; 12-30-2011 at 12:21 AM.

  10. #10
    diysmps Senior Member vorezky04's Avatar
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    so how with EE16?
    I am from indonesia.
    I love peace

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