¿What are these components?

Discussion in 'General Electronics Chat' started by ElectroBoy7, May 23, 2016.

  1. ElectroBoy7

    Thread Starter Member

    Dec 22, 2015
    33
    0
    I've disarmed a radio/cd/tape player that was broken and inside of it I saw a few unknown components which I've placed inside a red box in the next picture.

    http://prntscr.com/b7bvzi


    Can someone, please, tell me what are those and what are they use for?

    Thanks in advance!
     
  2. #12

    Expert

    Nov 30, 2010
    16,257
    6,763
    The big one is a variable capacitor and the little ones are transformers.

    That thing has to be very old. Those transformers are not used now.
     
  3. ElectroBoy7

    Thread Starter Member

    Dec 22, 2015
    33
    0
    Thanks for your fast reply.
    Well, It looks old. My question is, those transformers are the same as the ones used in a bridge rectifier? Could I use salvage them?

    How does a variable capacitor work? I've heard about variable resistors but I've never seen a variable capacitor.
     
  4. #12

    Expert

    Nov 30, 2010
    16,257
    6,763
    Those transformers are high frequency, like 455 KHz. No chance they are power transformers.
    The variable cap either works by compression or interweaving the plates.
     
  5. Willen

    Member

    Nov 13, 2015
    138
    12
    Hi,
    Do they use ceramic filters or crystal instead in these days? Or?
     
  6. #12

    Expert

    Nov 30, 2010
    16,257
    6,763
  7. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,511
    2,369
    The transformers look like two in each IF stage of a superhet rec, if so one would be AM the other for the FM stages.
    Max.
     
  8. ElectroBoy7

    Thread Starter Member

    Dec 22, 2015
    33
    0
    Thanks everyone for your responses!
     
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