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Tech Square Technical and speculative discussion of amps, cables and other topics. |
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Tech Square Technical and speculative discussion of amps, cables and other topics. |
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In Reply to: Controlling inductor vibration posted by bevo on September 10, 2009 at 20:23:22:
Hi,
I have serviced a few modern power amps that had large ferrite coils that can actually vibrate like a tuning fork and this can be heard in the output signal.
Early units of this brand had them simply glued to the PCB with a large glob of silicone RTV, but this is too compliant (freely allows vibration) and liable to break free from the adhesive under shipping shock and cause other issues.
The later solution we came up with was 2 small rectangular holes on either side of the donut so we can feed a nylon cable tie down under the board and back up, ratcheting down the ferrite coil to the PCB so it securely sits on the bed of silicone.
Probably still vibrates, but is now out of hearing range and no longer measurable, either.
Have yet to see the issue arise after that, 3 years later.
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Follow Ups
- RE: Controlling inductor vibration - Nagratech 09:01:37 01/19/10 (0)
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