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    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...
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    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?  ???
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    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...
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