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Re: What does a Marine Electronics Technician do?

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puetz

(A)

In Reply to: Re: What does a Marine Electronics Technician do? posted by Ron Oehl;ert on March 21, 2004 at 05:04:37:

G'day Ron Oehl;ert,
fair question (if your not trying to shit stirr), and I should know better for asking an obvious question. Repair/install/maintence on marine electronics such as radio, sat coms, sounders, sonar, gps radars etc etc, on ships to small boats. By pass can mean anything, bypass main caps, bypass ac input to ground bypass lots of things, so rather ask a dumb question than make a stupid mistake.
Besides, I seem to have too much emotional attachment to my amps (silly as it sounds) and I can't see the wood through the trees, so to speak, so logical thinking goes out of the window because I care too much for the darn things. As soon as it becomes just another unit I'm working on, all is okay and brain kicks in.
Cheers Robert

Follow Ups:

Re: Fair answer - Ron Oehlert 16:28:36 03/21/04 (5)
seems you understand why I asked. Apparently Mikey's suggestion is for user-added caps rather than factory installed ones, omit 'em if you like and have a good one.
- No worries mate, can you give me an opinon please? - Puetz 17:58:07 03/21/04 (4)
  G'day Ron,
  I am concerned about sound changes, for the better I hope, maybe in the bass, not sure. What do you think would change, sound wise, with larger p/s caps, and by-pass cap. Also, if I changed the bypass caps for larger value, 470nF to say 540nF (ie two .27uF Solen in parallel), would this be a good or bad move?
  As I said before, logic is on hold til I can see just an object in front of me not another family member!
  Cheers, Robert.
  - Re: No worries mate, can you give me an opinon please? - djk 21:45:53 03/21/04 (3)
    On amplifiers with main filters in the range of 20,000�F I find values of 22�F~47�F to work the best.
    Values in the range of 0.1�f~1�F work best closer to the outputs, the ground for the cap should be as close as possible to where the current drain is (speaker ground). These may cause oscillation. Try adding a small resistor in series, values less than 10 ohms. If the oscillations persist, remove the cap causing them.
    - Re: No worries mate, can you give me an opinon please? - Puetz 17:18:37 03/22/04 (2)
      G'day djk,
      in your opinon, would you suggest that since each cap will be 47000uF, 47 uf for each bypass cap be good choice?
      Cheers Robert.
      - Re: No worries mate, can you give me an opinon please? - djk 00:08:55 03/25/04 (1)
        
        In Reply to: Re: No worries mate, can you give me an opinon please? posted by puetz on March 22, 2004 at 17:18:37:
        
        Good place to start.
        When the values get much bigger than this (47�F) another smaller bypass is indicated, most people will want to try film for the smaller one, oscillations may show up at this point.
        
        I'll experiment, when I get guts ... - Puetz 04:13:44 03/27/04 (0)
        
        In Reply to: Re: No worries mate, can you give me an opinon please? posted by djk on March 25, 2004 at 00:08:55:
        
        G'day,
        to try, I don't want to change the sound and esecially damage the amp. Til then, I will keep the forum informed (maybe some one will be interested)
        Cheers, Robert.

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