Beautiful Homemade

Discussion in 'General Electronics Chat' started by Dr.killjoy, Dec 23, 2013.

  1. Dr.killjoy

    Thread Starter Well-Known Member

    Apr 28, 2013
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  2. Metalmann

    Active Member

    Dec 8, 2012
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    Downright sexy!:cool:

    Must have really been a labor of love:

    "After pouring the resin and allowing it to cure, he squared up the block on a belt sander, chamfered the edges with a router, and finally polished everything up with wet/dry sandpaper and Brasso."
     
  3. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Devil of a job to service, however. :eek:
    Max.
     
  4. atferrari

    AAC Fanatic!

    Jan 6, 2004
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    What I cannot understand (believe) is that you can get a crystal clear surface by polishing which is no more nor less than actual microscopic scratching all over...!

    Impressive!
     
  5. Metalmann

    Active Member

    Dec 8, 2012
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    Yeah, just how lenses are ground.
     
  6. bertus

    Administrator

    Apr 5, 2008
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  7. Markd77

    Senior Member

    Sep 7, 2009
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    I've done it, it takes ages, you have to use a lot of grades of wet and dry paper up to 1200 grade or higher, then brasso on a cloth wheel does give a good finish at the end. I bet he had to use a shaker and maybe vacuum to get rid of bubbles as well.
     
  8. Metalmann

    Active Member

    Dec 8, 2012
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    I've polished a few acrylic pieces using a propane torch.

    As long as you don't OVERheat it.;)
     
  9. ErnieM

    AAC Fanatic!

    Apr 24, 2011
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    Very good. +1.

    I just wish his encapsulation method was a little less "hands on."
     
  10. bountyhunter

    Well-Known Member

    Sep 7, 2009
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    First thing I thought of: going to be tough changing those electrolytic caps when they fail after about 5000 hours of service.
     
  11. trader007

    Active Member

    Feb 27, 2010
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    no kidding!
     
  12. tubeguy

    Well-Known Member

    Nov 3, 2012
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    Yep.

    But then it can begin it's second life as a beautiful coffee table conversation piece. :)
     
  13. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    Or the output jack for that matter, which will likely come much sooner.
     
  14. Sensacell

    Well-Known Member

    Jun 19, 2012
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    When it "Bricks" - it's already "Bricked"

    Beautiful piece!
     
  15. GopherT

    AAC Fanatic!

    Nov 23, 2012
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    Unfortunately, it is a lot of work for a headphone amp driven be an op amp that is intended to drive a minimum 600 ohm. I just can't figure out what audio source would benefit from such an amp. The "CMoy headphone amp" schematic is in the link below. The virtual ground is laughable - why dont they just take the node between the two 9-volt batteries instead of between two 4.7k resistors.

    A lot of acrylic polishing for a novelty that never should have been taken off of the breadboard.

    Original website describing the "CMoy" (who decided that an inverting amplifier circuit needed a name - other than, "inverting amplifier"?).
    http://tangentsoft.net/audio/cmoy-tutorial/

    Schematic
    http://tangentsoft.net/audio/cmoy-tutorial/misc/cmoy-tangent-sch.pdf
     
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