voltage source

Discussion in 'General Electronics Chat' started by vishnudas, Aug 20, 2010.

  1. vishnudas

    Thread Starter New Member

    Jul 21, 2010
    2
    0
    Is it possible to form a voltage source of 7v by connecting 10 diodes in series & taking the voltage across it..? if am using USB port of pc to get 5v wil it affect PC if there is any short circuit or problem in the circuit to which am connecting..? pls help out... Thanks in advance...:)
     
  2. Jaguarjoe

    Active Member

    Apr 7, 2010
    770
    90
    I suppose you could string 7 diodes together, but I don't think it will regulate very well. How about one of these:

    http://www.national.com/mpf/LM/LM317.html#Overview

    I'm not sure if USB power is short circuit proof. I'd hate to find out the hard way.
     
  3. mcgyvr

    AAC Fanatic!

    Oct 15, 2009
    4,771
    971
    Your question is really incomplete and/or doesn't make sense.

    No it is not possible to form a voltage source with diodes in series and no other components. A battery is a voltage source. A diode is not.
     
  4. marshallf3

    Well-Known Member

    Jul 26, 2010
    2,358
    201
    You could put some photodiodes together in series and shine a light on them, that would create a voltage source but of somewhat unpredictable output.

    What do you need the 7V for and what's it have to do with a USB I/O port?
     
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