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In Reply to: Panasonic V-850 posted by mikeyb on April 20, 2007 at 10:25:54:
what makes you think that 120hz is the frequency of interest wrt the sonic benefits people claim to hear from the use of the small L input filter?
Follow Ups:
My point exactly. I don't believe the choke that Jeff describes has any effect at 120 Hz, but if it is indeed a RF type choke it's only effect will be in the above 100 Khz region.
Calculate the roll-over frequency into a 30uf or 50uF cap, you'll be surprised. These are components typical of speaker crossovers after all.
See this to solve for - 3dB frequency easily .Jeff
That's fine, Jeff, but the point is that the formula ASSUMES a constant inductance with respect to frequency, which, as has been pointed out, is NOT a valid assumption for most real world inductors.Please, can you give us more details on the choke? What kind of core does it have (steel, ferrite, or air)? That is the critical question in determining what effect it has on the power supply.
As a general rule (assuming constant flux level), as frequency goes up, inductance goes down so i would expect more inductance at 120hz than at say 10Khz.dave
A bit off-topic, have you tried air-core inductors? Not cheap but you do report a correlation between reducing the amount of iron in the inductor and sound quality. Might as well try the limit.
Thermionically addicted.
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