easy voltage doubler/power amps?

Discussion in 'General Electronics Chat' started by stanman11, Sep 14, 2012.

  1. stanman11

    Thread Starter Member

    Nov 23, 2010
    230
    4
    EDIT

    I need to get 17v. Ages ago I remember using 1.5v and a transformer to light an LED. But only for an instant.
    Is there a way to configure this to constant power from a step up?
     
    Last edited: Sep 26, 2012
  2. crutschow

    Expert

    Mar 14, 2008
    13,028
    3,237
    What's the power source?

    If you already have a motor, why do you want to make one?
     
  3. vk6zgo

    Active Member

    Jul 21, 2012
    677
    85
    Sorry,the world doesn't work that way!

    Voltage multipliers are normally special types of rectifier circuits which produce a higher DC output voltage from a given AC supply than would normally be available.
    To do something like that with DC you would need a switch mode DC-DC inverter.

    BUT,here's the biggie!

    Your original source produces a set amount of power,where power = current times voltage or P=I*V.
    This means that,for the same power into your multiplier,if for instance,you double the voltage out, you get half the current out.
     
  4. Dodgydave

    Distinguished Member

    Jun 22, 2012
    4,998
    745
    What comes out is Always less than what goes in!!

    You dont get "owt for nowt" as we say in England.
     
  5. wmodavis

    Well-Known Member

    Oct 23, 2010
    737
    150
    Due to the law of Conservation of Energy you cannot increase both voltage and current simultaneously. Power OUT = Power IN (minus losses).
     
  6. stanman11

    Thread Starter Member

    Nov 23, 2010
    230
    4
    I need to get 17v. Ages ago I remember using 1.5v and a transformer to light an LED. But only for an instant.
    Is there a way to configure this to get constant power from a step up?
     
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