|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
71.204.54.207
Any concerns about doing something to damp vibration on plain oil wire coil inductors? I was thinking of using two vertical "stripes" of hot melt (doesn't get rock hard) to eliminate the vibration, but am not sure that won't have unintended consequences. Comments are much appreciated.
Follow Ups:
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.
Are you talking about the coils at the amp's output?
I've only heard them ringing near maximum power output at high frequencies.
How about a piece of appropriate diameter heat-shrink?
Easier to remove than glue if you don't like the result.
SF
After one look at this planet any visitor from outer space would say "I want to see the manager." - WSB
The best thing you can do to control crossover inductor vibration is to get an active crossover and eliminate the inductors altogether.
Although this is probably not what you wanted to hear.
Actually, this inductor is in my amp (Bryston 3B), so I don't think I can avoid it. Thanks though.
In this case i would just stop worrying.
Unless your amp sits on top of a subwoofer or you tend to use a jack hammer while listening.
External vibrations such as those from a subwoofer are not the only potential issue. As current passes through the inductor, the coils will vibrate on their own in the magnetic field, inducing additional currents in the wire that are not part of the original signal. In order to stop that you need to pot the coil.
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: