PWM help please

Discussion in 'Off-Topic' started by Breezy, Jul 6, 2010.

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  1. Breezy

    Thread Starter New Member

    Jul 6, 2010
    I am a new girl in electronics here and I hope this is the right place. I used to “play” with my grandfather when he worked on building electronics. I learned a lot about building PCB’s, but not to much about theory or how electronics works for that matter. I can usually follow a schematic and get something built. I hope to learn more because this is fun for me, building anyway. I am in college now and do not take any electronics or related courses, so this is just a hobby for me.

    I found a circuit from a guy called "Zero Fossil Fuel" that is a PWM with constant current …… parts???? And I found other similar circuits out there too. But this one has my attention cause I need a circuit that has constant current, but then I found another web site where a man says the "Zero Fossil Fuel" PWM is good, but has problems.

    This is what he says about the 1st attached circuit:

    The Circuit designed by "Zero Fossil Fuel" is better than normal PWM, however when it goes into the Current Limiting Mode, it operates in a Linear mode that causes the MOSFET’s to Over-heat. So you require a VERY LARGE HEATSINK to try to keep it from overheating.

    This is where I run into a problem, I have no idea what all that means.

    And he says his design of the "Zero Fossil Fuel" circuit is modified and better working than the original Zero has. I attached both of these schematics to let you know what I am refering to. And this guy says he has a PWM circuit that does what the Zero one does, but with no heat or any other problems. Bit he wont let anyone know what that is and you can buy it but it is covered in resin or epoxy or some sort of thing.

    So my main question is can anyone explain what Current Limiting Mode is and what does operate in a Linear mode mean. And if you can answer those questins maybe you can give me an idea how to make the circuit so it does not have those problems.

    Thank you all, Brianna Rose
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    If you are serious in this inquiry, then you are the victim of a scam. Do not believe a single word from either of the unscrupulous scam artists. What they promise is a lie.

    If you have any further interest in discovering why we think this is so, then you can read through the linked thread -

    We will not waste further time on these scams.
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