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In Reply to: More research & an article by Lynn Olson posted by nc on April 7, 2007 at 14:14:00:
However, I'd rather have one choke of higher inductance than two smaller chokes. Or even better, a choke with two windings: one in the positive and one in the negative rail (diff. mode choke). This would allow to reduce the amount of iron without compromizing the performance. Too much weight is a problem of GM70 amps.With GM70, power supply on a separate chassis is the way to go. Therefore, it is logical to keep CMC and the last filter capacitor on the amp chassis, and everything else on the PSU chassis.
I do not think that small computer supply RF CM choke with ferrite core is appropriate. Such small choke (microhenries) would do nothing to prevent audio signal from leaking into the power line. Proper CMC should have inductance of at least 100 mH. It can be wound on a silicon steel toroid. A great source for toroid cores are current transformers. They can be bought cheap from surplus dealers.
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- Sure it won't hurt to have more. - sser2 16:46:26 04/07/07 (0)
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