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Thread: Gray boxes?

  1. #1
    Join Date: May 2008

    Location: U.S.A. Neo-Socialist Kalifornski

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    Default Gray boxes?

    Can a DYI er tell me what the two gray boxes are behind the volume potentiometer and in front of the electrolytic capacitor ?
    Relays,Caps?
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    Jeff :UBERTHREADKILLER

  2. #2
    Join Date: Oct 2012

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    I'm Alan.

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    Capacitors at a guess, do they have any numbers on them such as 475 or similar?

  3. #3
    Join Date: Feb 2013

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    look like polyprop caps
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  4. #4
    Join Date: May 2008

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    Quote Originally Posted by Firebottle View Post
    Capacitors at a guess, do they have any numbers on them such as 475 or similar?
    The round electrolytic says 470 but nothing on the gray boxes or on the board.
    Jeff :UBERTHREADKILLER

  5. #5
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    They are not marked but I found a schematic that lists them as C2L and C2R as AC coupling caps.
    Jeff :UBERTHREADKILLER

  6. #6
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    The markings are probably positioned next to one another, so you can't see them.

  7. #7
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    Quote Originally Posted by Firebottle View Post
    The markings are probably positioned next to one another, so you can't see them.
    Your right, I looked up the JDS Labs Cmoy kit goggled the part numbers and they are Vishay 1uf AC 40v DC 65V caps.
    Odd thing that made me ask the question , with what tested as a good 9v battery 9.28 volts dc on my multi meter . When I played my headphones and ipod through it, It started to oscillate ,switching click,click click click really fast!
    I even took the board out inspected it for burn marks on the bottom thinking the solder tits may be shorting on the bottom of the tin case, I put a thick layer of electricians black tape on the bottom of the tin as an insulator.
    I thought it may be a relay as the battery was over 9v. I put in a new battery right out of the wrapper and all was well. Go figure...
    The battery in question dose have a slight bulge in the middle , maybe thats the problem funny it tested so good.
    Last edited by goraman; 05-02-2019 at 19:50.
    Jeff :UBERTHREADKILLER

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