I am currently working on a OLED display. It needs a supply of 12 vdc. the Display works perfectly which i'm manually switching to 12v (using a mechanical switch). It needs to be automatic, because the Display follows a power up sequence (step by step sequence). I followed the below link and tried that circuit, but it only gave out 3.7 v output. My requirement is 12v , 100 mA to OLED. I would welcome your suggestions.
link : http://teachmetomake.wordpress.com/how-to-use-a-transistor-as-a-switch/
link : http://teachmetomake.wordpress.com/how-to-use-a-transistor-as-a-switch/