From: Bruce Griffiths <[EMAIL PROTECTED]> Subject: Re: [time-nuts] 5060A question Date: Tue, 08 Jan 2008 15:31:17 +1300 Message-ID: <[EMAIL PROTECTED]>
Hej Bruce, > > Maybe set up a tuned box around it to cancel whine. > > > > MVH > > Magnus > > > > > Hej Magnus > > Do you mean an active noise cancellation system?? No, you could do that too, but I was basically refering to a simple box tuned in size to cancel at 2 kHz. Toss in a thick cloth for additional resistive damping. You could even go Helmholtz if you want. Simple passive cancelation. Classical acoustical approach. For 2 kHz it is in reasnoble sizes. Another thing is to put heavy lead-rubber on the metal faces to make them less of a resonator/radiator. That mod can be done inside the box. There are a whole bunch of other tricks. Pressing on the surfaces of the whining chamber will make it stiffer and provide a higher acoustical impedance. Pressing using rubber blocks, from say silicon rubber, is known to work. Cheers, Magnus _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
