Few Noob Questions

Discussion in 'General Electronics Chat' started by Vckay, Aug 7, 2005.

  1. Vckay

    Thread Starter Member

    Aug 7, 2005
    14
    0
    Hi, I am new here. I was recently salvaging components from a pretty old panasonic radio. There were a couple of small transformers.
    Is there any way I could find out the voltages they accept and step down?
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Hi,

    If it's AC powered, only one is likely to be a power transformer. The line cord should have led to it. It might be difficult to tell much about the output without a meter to see what it puts out. Really small ones are likely to be audio impedance matching transformers, out even output transformers. They are pretty useless for junkbox purposes.
     
  3. mozikluv

    AAC Fanatic!

    Jan 22, 2004
    1,437
    1
    hi

    you can also salvage some of the capacitors like ceramics, tantalums, and metall;ized film caps, but not the electrolytics. the transformers are usually the output transformers and coupling transformer and its power supply transformer. as to the power transfo you can check for continuity if it's open or not. however you won't be able to know whether the coils are grounded or not.

    moz
     
  4. Vckay

    Thread Starter Member

    Aug 7, 2005
    14
    0

    Hi..Thanks for the advice everybody. I would like to ask a few more questions if possible.
    The radio is nearly three decades old.I am finding it difficult to identify some of the components because the serial numbers are not really clear. Is there any particular sight that helps in visual identification ? ( I don't really want to identify the transistor/diode/other component exactly ..just finding what family it belongs to be would be great)
    And also Why not the electrolytic capacitors?
     
  5. mozikluv

    AAC Fanatic!

    Jan 22, 2004
    1,437
    1
    hi,

    to put it simply the chemical potency inside the electrolytics changes thru use and time. each electro cap has a certain lifespan usage, say 3000 to 5000 hrs. although you can still use this provided that the cap can still charge/discharge, reliability factor is now a big factor.

    as to identifying parts like transistors, diodes etc., you can do a google search for it.

    moz
     
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