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  1. P

    electromagnets

    question. how do i make an electromagnet? do i need the magnetic wire to be insulated? and can a nail be used as a core for it?? thank you for your answers.
  2. P

    cellphone battery charger

    one question please, if I connect a voltage output from a power supply to a cellphone battery, will the battery start charging? thanks
  3. P

    Model train railway project w/o pic

    we were making a project, model train railway, without the use of microcontrollers and PIC, I would just like to ask, what can I use for the lever that goes down when the train is near and goes back up again after the train passes. any ideas for what I can use for that? thanks
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