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Can you really HEAR mkt caps?

Discussion in 'Electronic Design' started by Michael, Feb 3, 2006.

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  1. Michael

    Michael Guest

    I know they look good on test equipment but can you really hear the
    difference in an audio circuit with these MKT capacitors?

    I have an analog devices op amp and I've put a couple of 10UF electrolytics
    back to back in a non polarized arrangement on the output and it sounds
    awful good to my ears.

    I ordered some to compare but I'm a cynic by nature.
     
  2. Pooh Bear

    Pooh Bear Guest

    The idea that different types of film caps have 'a sound' is as plain berserk
    as the audiophool notion that some copper ( the type blessed by companies
    charging a lot of money for theirs ) sounds better too.

    Electrolytics aren't beyond blame though. I could discuss this at length and
    have actually made some measurements of same.

    Unless you actually need to block a DC voltage > ~ 100 mV you should use only
    *one* electrolytic. They don't care about polarisation ( reverse or otherwise )
    this low. Using 2 back to back without the mid-point being biased actually
    makes their influence ( distortion - albeit tiny ) worse.

    Also I would recommend a larger cap for coupling an output. I use 100uF.
    Nothing to do with low frequency cut-off but everything to do with ensuring the
    ac signal across the cap is as tiny as possible.

    Graham
     
  3. a bit OT but in
    http://tangentsoft.net/audio/opamps.html

    A little quote about OPA132

    "This is a nice family of op-amps. The sound has the typical
    Burr-Brown laid-back nature. It's a bit tubby on the bottom end. This
    is not an exciting sounding chip......"

    Precision stuf, eh?



    martin
     
  4. Only if you're a true audiophool IMO. ;-)
    I hear that on the cynic stuff. I am interested in seeing your report
    later.
     
  5. Tim Williams

    Tim Williams Guest

    My MKP's sound pretty good. Idunno about MKT.

    What? I should hope your capacitors make a sound when you run a few hundred
    amperes of LF through them.

    Tim
     
  6. Rich Grise

    Rich Grise Guest

    .
    LOL!

    Thanks!
    Rich
     
  7. Rich Grise

    Rich Grise Guest

    I just discovered a couple of LM386s and a .25W, 8ohm speaker in my
    junque box - I wonder if I could make a good audiophool amp? ;-)

    Cheers!
    Rich
     
  8. Pooh Bear

    Pooh Bear Guest

    How anyone can classify an op-amp as having a 'tubby bottom end' begs belief. I
    guess they don't know much about how negative feedback works.

    Graham
     
  9. Sjouke Burry

    Sjouke Burry Guest

    An audiophile can hear anything,even .0001 percent
    distorsion,up to 400 KHZ etc, so... ??????
     
  10. Robert Baer

    Robert Baer Guest

    There are some electrolytics that perform very well with reverse
    voltages up to 40% of forward rating, and are superb up to 10% of rating.
     
  11. Robert Baer

    Robert Baer Guest

    Low and medium voltage ceramics make a big bang at 500KV....
     
  12. budgie

    budgie Guest

    Sounds like their wine appreciation writer had to turn in the review.
     
  13. ehsjr

    ehsjr Guest

    Announcing the new TIP (Trazepoidal Inline Package) family
    of audio op amps, specifically designed to reverse the
    tubby bottom end effects associated with older packages.

    | | | | | | | | | |
    ---------------------
    \o /\ Top /
    \ || /
    \ || Bottom /
    --------------
    | | | | | |

    Features:
    o Distinctive Pin one marking
    o Directional arrow identifies wider top end for brilliant highs
    o Labeling of *both* top and bottom end
    o Narrowed 6 pin bottom end response eliminates tubbyness
    o Increased top end 10 pin range

    Available in:
    - PbSO4 washed version for acid rock
    - Au plated for golden oldies
    - Platinum finish - recommended for top sellers only

    Prices available on request.
     
  14. Jim Thompson

    Jim Thompson Guest

    [snip]
    Better copyright that... it'd probably sell ;-)

    ...Jim Thompson
     
  15. It will only sell if he asks at least $500.00 each.
     
  16. I almost forgot, it will have to be pumpkin orange in color.
     
  17. Jim Thompson

    Jim Thompson Guest

    With gold trim ;-)

    ...Jim Thompson
     
  18. Chris Jones

    Chris Jones Guest

    The distortion produced by an electrolytic capacitor will be smaller than
    the signal across the electrolytic capacitor. In fact, second-order
    distortion will probably decrease with the square of the signal across the
    capacitor and third order distortion will probably decrease with the cube
    of the amplitude of the signal across the capacitor. Therefore in order to
    achieve very low values of distortion, it would suffice to use a large
    value electrolytic capacitor, so that the amplitude of the signal across it
    is small.

    Chris
     
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