I need power supply without transformer

Discussion in 'General Electronics Chat' started by th0rnbird, May 6, 2008.

  1. th0rnbird

    Thread Starter New Member

    Nov 10, 2006
    3
    0
    I need a low currunt (100 mA) power supply without trans former please help me with your new idea!
     
  2. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
    230
    Why?

    There are "transformerless" power supplies out there (Google: transfomerless Microchip), but...they are useful only at low currents...<~20mA. As the current requirements increase the electrical and physical size of the components quickly increase to a point where a transformer/rectifier/cap configuration is smaller. There are also AC-DC SMPS's that are very small and efficient, but do contain a "transformer".

    Ken
     
  3. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    We would have to insist on the use of a transformer for safety reasons. Wall transformers are quite inexpensive - why expose yourself to risk?
     
  4. studiot

    AAC Fanatic!

    Nov 9, 2007
    5,005
    513
    You haven't said what voltage you are looking for, but 100mA can readily be supplied for useful periods by even quite small batteries, and of course you can use rechargeables for prolonged use.
     
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