Switching adapter into 120v DC

Discussion in 'The Projects Forum' started by aguywithfeet, Jun 6, 2014.

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  1. aguywithfeet

    Thread Starter New Member

    Jun 6, 2014
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    I have a 100 - 240v ac to 5v DC switching adapter. Is it possible to intercept the voltage just after the rectifier and get 120v dc. I have read different things, the consensus seems to be that switching adapters rectify 120vac to 120vdc then run it through a transformer to drop it to the needed voltage, then through some filtering and regulation. Is this correct?

    I am trying to make a simple led light, if I use 120 vdc I would need less resistors. I believe.
     
  2. inwo

    Well-Known Member

    Nov 7, 2013
    2,433
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    Yes but no.

    There is no practical or safe reason to do it.

    In fact thread may well be closed for the suggestion.:D
     
  3. alfacliff

    Well-Known Member

    Dec 13, 2013
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    when using the adapter on 120 volts ac in, there is about 170 volts after rectification and filtering. there is no 120 volts dc in there at all.
     
  4. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,791
    1,103
    .... and that 170V is not mains-isolated so can be LETHAL.
    Read the Terms of Service of this site regarding transformerless power supplies!
     
  5. crutschow

    Expert

    Mar 14, 2008
    13,001
    3,229
    What type and number of LEDs do you have?
     
  6. Wendy

    Moderator

    Mar 24, 2008
    20,765
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    This thread is against the AAC forum rules, Chapter 6, as seen here:

    This can be found in our Terms of Service (ToS)
     
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