Recent content by Yoyok

  1. Y

    Electronic ignition

    Try this CDI from Silicon Chip magazine.
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    The simplest and economical pcb etching

    Omni, you're right. My technique is for the people that can live with the lazziness  ;D (because I'm lazzy too). Before I use this technique I have had etch with electrolysis using acid from a car battery. My pcb on + and - on stainless steel. I use 12 V 5 A. The etch really faster but the acid...
  3. Y

    The simplest and economical pcb etching

    I wonder why the people use heater and bubble for ecth the pcb? Usually I just floating or arrange my pcb on water and let chem reaction and gravitation do ecth. With this technique there is no electricity and heat. See the picture to know what I mean. But you can do it, if you're in no hurry...
  4. Y

    What's wrong with electronic car ignition project?

    Ok. I'll try to search it.
  5. Y

    What's wrong with electronic car ignition project?

    Does anybody tried this project? http://www.electronics-lab.com/projects/automotive/008/index.html. I always see the yellow flag that warn us to not to create this project. What's wrong with this project?  ???
  6. Y

    VERY nub need some help on a project

    For water proof plastics you can use reguler plastic box and fill it with epoxy resin mixed with the hardener (usually epoxy resin and hardener is one packages).
  7. Y

    free energy motor

    I think this is not free energy. Because we must create a magnet! I think here it is about free energy: electrical (not free) -> magnet -> arangement -> electrical -> motor                                                     |------------- free energy -------------|                ...
  8. Y

    How this switch working?

    Thank for your answer Indulis! Now I will search about flyback converter to make everything clear. Thanks again!
  9. Y

    How this switch working?

    Hi, I have found a schematics to car ign. in picture below from internet (but I forget the address, sorry). But I confuse how its work! It's seem stranger to me because this sch. doesn't follow the rule about transistor as switching. But it's working well. I will explain how this sch is work...
  10. Y

    Need to design a filter to allow only voice frequencies

    Or try this, www.ti.com/sc/docs/apps/msp/journal/nov2000/nov_08.pdf.
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