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  1. S

    3.5mm Headphone Jack LED?

    iPhone to drive LED Khankll, yes you are right. I would have to transform the AC before converting it to DC. Davenn, i would like an iPhone to power the LED and have a custom song/app manipulate the output. I was also considering using a battery to drive the LED and connect the audio...
  2. S

    3.5mm Headphone Jack LED?

    Is it possible to make a LED flash with a standard 3.5mm headphone jack as the only power source? I was thinking that you would do the following: 1) write a program that would maximize the output from the headphone jack. 2) Use a bridge rectifier to turn the headphone jack from AC to DC...
  3. S

    Copper sheet for Ground?

    please explain What would it be shielding? And can I attach this shield to any surface and still act as ground?
  4. S

    Copper sheet for Ground?

    I apologies if this is elementary, but I took apart an ipad dock/stand and found that three of the control buttons on a pcb is attached to a 1"x3" copper sheet (which is glued to the plastic housing). Is this used for ground? I don't understand why they would do this if it is ground, since...
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