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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: RE: Damping the Foating CDP Laser-Track Tray posted by Dryginger2 on February 20, 2015 at 17:07:24:
older Harman CD player circuit.
Second is photo of laser assembly.
Harman had relatively sophisticated CD machines for its time and cost. Notice the copper shields on particularly noisy IC's. The DAC chips are also placed under the board to provide more of a ground plane and EMI isolation. You can see the outline of the chips on the top of the board.
The laser assembly shows the shield off. You can see the copper coils surrounding the lens assembly. On the large coils are two smaller coils on each side. I soak those coils in ferro fluid ( CAREFULLY!), not dripping. Most laser lenses assemblies have similar motor assemblies although the orientation may be different.
The next generation of HK machines were even more sophisticated with star grounds and special EMI casings (7450, 7600). Note all analog output stage. Suitably modded they could sound as good as a Wadia separate (IMHO).
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Follow Ups
- RE: Damping the Foating CDP Laser-Track Tray - unclestu 20:19:46 02/20/15 (12)
- RE: Damping the Foating CDP Laser-Track Tray - fastcat 10:48:12 02/21/15 (9)
- RE: Damping the Foating CDP Laser-Track Tray - Dryginger2 18:26:57 02/21/15 (3)
- not sure if we're talking the same thing - unclestu 11:55:59 02/22/15 (2)
- RE: not sure if we're talking the same thing - Dryginger2 17:31:18 03/13/15 (0)
- RE: not sure if we're talking the same thing - Dryginger2 13:09:50 02/22/15 (0)
- RE: Damping the Foating CDP Laser-Track Tray - unclestu 13:46:22 02/21/15 (4)
- To Unclestu about the ferro fluid tweak - fastcat 15:23:14 02/22/15 (3)
- RE: To Unclestu about the ferro fluid tweak - unclestu 16:08:24 02/22/15 (2)
- Some photos - unclestu 12:18:53 02/25/15 (1)
- RE: Some photos - fantja 07:48:00 03/02/15 (0)
- RE: Damping the Foating CDP Laser-Track Tray - fantja 06:13:28 02/21/15 (0)
- RE: Damping the Foating CDP Laser-Track Tray - Dryginger2 22:23:22 02/20/15 (0)
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