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  1. S

    boost converter

    I tried to wind a transformer, but it didn't work. I used a square ferrite block and wound 1 turn of 24-26 AWG wire on one side and 32 turns on another. What am I doing wrong?
  2. S

    boost converter

    Okay, that's kind of what I thought I needed to do. I will test it tomorrow and get back to you.
  3. S

    boost converter

    I set it up without using a switch, and two 6V lantern batteries and it gave me about 25V off of a salvaged transformer. I'm not sure what the winding ratio is, but plan to make my own. The only problem I noticed was that it would lose voltage very quickly. The capacitor that I was using was a...
  4. S

    boost converter

    You lost me on the last post. Is the schematic you posted all I need to assemble to charge? If so I can get this done after school tomorrow and report back. Would it work if I just touched the battery to the transformer once a second, or do I need an electronically controlled switch to do this?
  5. S

    boost converter

    The capacitors are DC. Don't they blow up when charged with AC? Could you post a schematic of how I would rectify the output using diodes? When something like this is charging, what should I expect for a charge time?
  6. S

    boost converter

    Couldn't figure out what happened, thanks for reposting it. I've got a couple more questions about the pulsed DC and transformer. If it is pulsed DC, do I get DC or AC output? If it is AC, would I use an inverter to change it to DC? How much current could I expect to get from it? If it is...
  7. S

    boost converter

    How do I get the pulsed DC, a 555 timer with low frequency? From what you have said, this seems like it would be better than the boost converter. Will any type of transformer work? I have one sitting in the basement from a dehumidifier. How do you make the comparator? I've heard of them, but...
  8. S

    boost converter

    Still have a problem, don't you need AC to use a transformer?
  9. S

    boost converter

    I was hoping to avoid the using the mains, my parents won't let me. Can't afford a variac, either.
  10. S

    boost converter

    The capacitor bank I have been using to this point is 330V 1900uF. When I charged this with a photoflash charger, it took 4 minutes. The new bank is 350V @ 56700uF or 700V @ 14400uF. I would like it to be able to charge to 700V, but keep the charge time down to about 30 seconds. The schematic...
  11. S

    boost converter

    Not sure where to find it. I actually gave up on the IGBT and am using two 400V 8A NPN transistors in parallel because they gave me a higher voltage. If you tell me where it would be, I'll give it to you. I think the switch may be the problem after trying to alter the duty cycles on the timers.
  12. S

    boost converter

    I have tried another inductor in parallel and it gave me an increase of about .5V. Is it necessary to put the circuit on the board? I am not quite at the stage of being able to put his on a board. Do you think this is causing the problems?
  13. S

    boost converter

    On the last post, the first is a pic of two inductors, the second is the diode and inductor. These two are: the whole setup, and the transistors, respectively. [attachment deleted by admin]
  14. S

    boost converter

    Ok let's try it again. [attachment deleted by admin]
  15. S

    boost converter

    L1 is an RF choke form radioshack, 100uH. I have three available. Wah tdo you mean I need another cap. Don't I just have the bank I'm trying to charge in between?
  16. S

    boost converter

    I have changed the duty cycle, but it also changed the frequency. The duty cycle is anywhere from 66.6-99.1%. Because the frequency changed, I can't tell if the duty cycle or the frequency makes the most difference. The timer that works the best is 2186Hz @ 66.66% duty. Is it better to have a...
  17. S

    boost converter

    I have been trying to build a boost converter, but am having problems. If you aren't familiar with these, they use an inductor, diode, a semiconducting switch, and a 555 timer. The voltage builds up in the inductor, and is pumped into the capacitors. The diode prevents it from flowing out. I can...
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