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  1. You can not use the voltage feedback optocoupler...

    You can not use the voltage feedback optocoupler if you like. Because the supply is not isolated (in GND = out GND) you can just tie the feedback to the 3.3V output of the supply. Make sure the...
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    In a pinch you can just connect the voltage...

    In a pinch you can just connect the voltage feedback wire to the 3.3V output. You probably will have to change the feedback resistor R6 to a 220 ohm to get the range out of the potentiometer.

    For...
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    Yeah, use a MOSFET with a lower Rds(on). A good...

    Yeah, use a MOSFET with a lower Rds(on). A good example would be the IRL1404. It's a bit more expensive though. Most MOSFETs are designed to withstand very high temperatures, but a lower Rds(on)...
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    Hi Marsjell, It does seem like it may be wound...

    Hi Marsjell,

    It does seem like it may be wound incorrectly then, or possibly connected wrong. If you hook the negative side of the +5V winding to the +3.3V winding positive, this would give you...
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    Hey no worries mate, we all had to start...

    Hey no worries mate, we all had to start somewhere! I don't think he meant to put you down.

    Check out this web page:
    ATX schematic

    It uses no optos, and a gate driver transformer. I think it...
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    Excellent book, I give it two thumbs up! Haha,...

    Excellent book, I give it two thumbs up! Haha, seriously though, this book has the best collection of practical information I have found so far.

    Presslab
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    Hmm, sounds like an emitter follower. This...

    Hmm, sounds like an emitter follower. This should be fine. The voltages you want to look out for are the collector to base, emitter to base (reverse biased), and of course collector to emitter. ...
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    If you break the E-Cores, they will no longer...

    If you break the E-Cores, they will no longer work right. No matter how well you glue them, it doesn't matter. They are pressed into shape with extreme pressure, and heat because of pressure. If...
  9. Well, I know my supply has 5.1V on the +5 and...

    Well, I know my supply has 5.1V on the +5 and 11.8V on the +12. If you don't have any type of load to spare, then you'll have to use resistors. For the +12 use a 10 watt 18 ohm (or so) resistor. A...
  10. moahdib, The transformer is designed to work...

    moahdib,

    The transformer is designed to work down to 6.5V. The PWM IC has a undervoltage lockout at 8V. So, the supply with work down to 8.3V continuous, with a dip to 6.5V for a second or so...
  11. Marcel, Let me know if you need any more help,...

    Marcel,

    Let me know if you need any more help, you're almost there.

    Presslab
  12. Mike, You probably can do my power supply mod...

    Mike,

    You probably can do my power supply mod to it. One transformer will be the main one, the next will be the +5V standby one, and the last might be a filter on the output, or possibly a...
  13. Looking good Arby, congrats! It took me a better...

    Looking good Arby, congrats! It took me a better part of a day too, but it was worth it!

    Presslab
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    www.protel.com (http://www.protel.com) ...

    www.protel.com
    astalavista.box.sk

    That's all I'm gonna tell ya.

    Presslab
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    You probably have ringing on your diode. Use a...

    You probably have ringing on your diode. Use a big fat 10 gauge wire to connect the SMPS IC to the diode. This is the most critical connection, the others aren't as critical. If you have ringing...
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    How much torque will it take to turn over a small...

    How much torque will it take to turn over a small engine? I don't really know for sure. I have seen how big starter motors are, I own one.

    The better RC car motors can put out 1.5in/lb of torque...
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    Skinnyboy, Sounds like a neat idea, how about...

    Skinnyboy,

    Sounds like a neat idea, how about this:

    Use some high RPM high load DC motor. Like a RC car motor. If you can find a DC motor spec'd for the gas motor's RPM, great. If not the...
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    Marsjell, The way the circuit is set up now it...

    Marsjell,

    The way the circuit is set up now it requires an optocoupler set up for the best regulation. You can connect the voltage feedback lead to one of the outputs (perhaps 3.3V or 5V) and...
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    Sorry for the tardy response, I have been busy...

    Sorry for the tardy response, I have been busy lately. The 1.5KE27CA is bi-directional, so you can hook it up either way. The BYV32E is a dual diode in one package, but you want to use just one. ...
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    Sorry to let you down, but I already have a...

    Sorry to let you down, but I already have a girlfriend! :D It's good to have the tape between all the windings, but the most important is between the secondary and the primary, like you have it...
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    Yes the polarity is important. You can wind it...

    Yes the polarity is important. You can wind it the other way, but normally you wouldn't do it that way. Do it this way. When you start winding, designate the wire you start with as the one with...
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    Just let me know if you need more help. To...

    Just let me know if you need more help.

    To clarify things, the 2 turn transformer has your same secondary windings, the 2x3, 1x4 and 1x5 in the same locations. On the primary all three windings...
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    It must be because you used a 220V and I used a...

    It must be because you used a 220V and I used a 120V supply. Although looking at your turns ratio, I would have to guess it is a full range supply, 80-260V or something like that.

    Warning, class...
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    The one I used had two transformers. The main...

    The one I used had two transformers. The main one, and then the little standby one. Just pull both of them out, and the main one is the one you will redo. The standby one will be replaced with a...
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    mikeinsanmarcos, Congrats on the nice ride! ...

    mikeinsanmarcos,

    Congrats on the nice ride!

    Aaron Cake,

    I had an '87 RX7 turbo, excellent engine. With a few mods (exhaust, intake, custom boost controller), I had red-lined the tach in 5th...
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