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large power amplifier

Discussion in 'General Electronics Discussion' started by foTONICS, Sep 17, 2015.

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  1. foTONICS

    foTONICS

    332
    9
    Sep 30, 2011
    I don't really have a question about this, I just figured people may be interested in this large transformer I found inside a power amplifier I have here at work
    20150917_160049.jpg 20150916_164651.jpg

    Actually I do have a question. The high wattage resistors across each of the caps, that's to slowly dissipate any left over energy inside the caps once I turn this off right?
     
  2. davenn

    davenn Moderator

    13,901
    1,971
    Sep 5, 2009
    yup, typical of AF and RF power amplifiers over the last 10 - 15 yrs



    yes that is correct
     
    Martaine2005 and Arouse1973 like this.
  3. Ratch

    Ratch

    1,094
    334
    Mar 10, 2013
    Yes, those are called "bleeder resistors". If I knew the capacitance value of each of those caps, I could calculate the RC time constant of that circuit.

    Ratch
     
  4. foTONICS

    foTONICS

    332
    9
    Sep 30, 2011
    I believe it was 33000uF
     
    Last edited by a moderator: Sep 18, 2015
  5. Ratch

    Ratch

    1,094
    334
    Mar 10, 2013
    OK, 33000uf *4 caps * 2000 ohms/4 = 66 sec, or a time constant of about 1 minute. So in 1 minute the voltage will drop to e^-1 or 37% of its max value and in 2 minutes it will drop to e^-2 or 13.5% of its max value.

    Ratch
     
  6. rickselectricalprojects

    rickselectricalprojects

    118
    12
    Feb 1, 2015
    what's the rating of the transformer?
     
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