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My RPi is working fine and automatically connecting to wifi when powered from USB but when I try to power it from a regulated 5V supply on the extension headers I can see that it goes on but then short after a while the wifi dongle's light goes off and I never get a chance to even ssh in. When I powered it from usb again it works completely fine. Any idea what could be causing it and what I can do about it?

PS. The 5V is regulated from a 12V open frame power supply and seems to be a very solid supply.

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    Seems like the 5V isn't stable enough. What are you using to convert the 12V to 5V? – Gerben Nov 28 '13 at 16:46
  • I am using a normal 7805 regulator but with 2 10uF capacitors only on the 12V input. Should I add some on the 5V output? – Gerharddc Nov 28 '13 at 16:52
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    Definitely. The datasheet suggest adding a 0.1uF to the output and .33uF to the input (sminntech.com/images/7805datasheet.gif). I'd try also adding a electrolytic cap, something like 10uF. – Gerben Nov 28 '13 at 17:47
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    I'll give it a try tomorrow and see if it helps – Gerharddc Nov 28 '13 at 18:54
  • Hello Gerharddc, did you solve the issue? Please feel free to share your experience by writing your own answer. – Ghanima Jan 1 '16 at 13:26

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