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Capacitor Knowledge Wanted

Discussion in 'Audio' started by King Forrest, Jan 22, 2020.

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  1. King Forrest

    King Forrest

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    May 24, 2018
    I guess I just assumed all the disc shaped ones were ceramic. Kinda hard to tell from my photos though. Maybe i'll break out my photography lights and play around with the DSLR modes a bit :p

    As for tolerance, what's our tolerance on that? When I use the search filters on websites like Mouser, I see all of the "audiophile grade" ones being rated at 20%, where's others are only %10. Plus, they're only rated for 1000 hours @85c. That's like, not very long.

    I'm also a little confused on "snap in" caps, do they fit into normal through-holes, or are they for a special mount of sorts?
     
  2. Audioguru

    Audioguru

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    Sep 24, 2016
    Electrolytic capacitors in the good old days had a plus sign.
    Not anymore, now they have a minus (negative?) sign.
     
  3. King Forrest

    King Forrest

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    May 24, 2018
    Okay, so I've made a rather crude diagram of how the signal flows through the circuit. The red/black goes to the speakers. Everything else is input. Not sure if it's of any relevance, but I would like to know what exactly does what. For the amps, Pin 1 is -(gray/grey/crème/green) and Pin 2 is +(ping/orange/yellow/grellow). Not sure if everything else is corrent +/- wise. inout.jpg
     
  4. King Forrest

    King Forrest

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    May 24, 2018
    Something I just realized....those cereamic caps, marked "220" should be .022nf, right. But my meter shows them as .22nf, same as a "221" cap. The heck's going on?
     
  5. davenn

    davenn Moderator

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    Sep 5, 2009

    no it isnt
     
  6. davenn

    davenn Moderator

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    Sep 5, 2009

    It is NOT a tant and it is 22pF NOT 22uF
    and it isn't polarised
     
  7. davenn

    davenn Moderator

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    Sep 5, 2009
    Meter inaccuracies ?
    of course some el cheapo manufacturer may have not followed the standard marking procedure and they really are 220pF
     
  8. Ylli

    Ylli

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    Jun 19, 2018
    three sig figs instead of two sig figs and a multiplier. Not too uncommon. That's why a capacitance meter is a good investment.
     
    davenn likes this.
  9. King Forrest

    King Forrest

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    May 24, 2018
    Okay, got some of the replacement caps in today, settled on some Nichicon UFG caps, with a lovely black on gold wrapper.

    But something i neglected to ask beforehand...there's one more type of cap, a yellow rectangle of sorts lables "D104J~2P3" (~ representing the logo, so I assume) I can't seem to find any cap decoder charts that use this format.
    It is also connected to the same traces as the large caps photoed earlier, like litteraly right beside them.
     
  10. davenn

    davenn Moderator

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    Sep 5, 2009

    yellow rectangular one will be a mylar or similar type, 104 = 100,000pf = 100nF = 0.1 uF
     
    Martaine2005 likes this.
  11. Ylli

    Ylli

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    Jun 19, 2018
    and 'J' usually means 5%
     
  12. King Forrest

    King Forrest

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    May 24, 2018
    Umm.....I did a dumb-dumb. I didn't take photos, and my parts tray got messed up...
    There's no shcematics for this.
    How screwed am I?

    Is there a way to just kinda figure it out?
     
  13. davenn

    davenn Moderator

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    Sep 5, 2009
    very

    electrolytics will probably have a + sign near one hole, the ceramics and other type wont
    trying to get the right values in the right places would be like a jigsaw puzzle with no pic on them to build up

    You really need to locate a schematic
     
  14. King Forrest

    King Forrest

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    May 24, 2018
    Okay, made some progress. I found a single photo, a close up of just one spot...but since I know all of the ins and outs work the same, I was able to fix a few things using only that small photo. Not much left although I seem to be missing some caps. I counted 8 spots on the board that are polarized, but only 6 polar caps. Hopefully they're just under a pile of clothes on the floor.

    As for the schematics...doubt there is any, it is a Ford OEM part after all. But, I did ask the Taurus Club forums and hopefully someone there can get my a diagram or something.
     
  15. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,363
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    Jan 21, 2010
    Photos of another unit would probably suffice.
     
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