transformer problem

Discussion in 'Homework Help' started by ninjaman, Dec 12, 2013.

  1. ninjaman

    Thread Starter Member

    May 18, 2013
    306
    1
    hello
    I have to make power supply analysis using

    1 transformer 12vrms
    1 bridge rectifier
    1 resistor 4.7kohm
    4 capacitors 1uf 22uf 47uf and 100uf
    1 oscilloscope
    1 multimeter

    I measured the voltage coming out of the transformer at 20v, secondary
    I connected the components and got the following

    caps oscilloscope(dc ripple) meter(mean dc)
    1uf 17v 20v
    22uf 2.1v 26v
    47uf 1.4v 27v
    100uf 450mv 27v

    when I made measurements without the capacitors, using the oscilloscope I got 28v and 21v with the meter across the resistor.

    I did use multisim and got 15v for the mean dc with the 100uf cap.

    im not to sure what im doing wrong here?

    any help would be appreciated!!!

    all the best

    simon
     
  2. t06afre

    AAC Fanatic!

    May 11, 2009
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  3. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    3,373
    1,159
    what is the transformer model number? or post a picture.
     
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