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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: You are perhaps confusing two things. posted by clifff on November 3, 2005 at 10:07:02:
So-called "soft-recovery" diodes are indeed more rapid in switching from the 'on' to 'off' states because they store less charge compared to ordinary rectifier diodes. The consequence of stored charge is a reverse current pulse as the input voltage changes polarity. This current pulse has a steep trailing edge, which the inductance of the related circuits converts to a voltage pulse. The RF ringing is the response of the associated circuits to this voltage pulse.Some audio builders add snubber circuits to the rectifiers. These are series R-C networks that provide dissipation for some of the RF. However, limitations on the capacitors' bandwidths make this less effective than reducing the magnitude of the transition pulse in reducing noise.
I've seen posts regarding Schottky rectifiers that describe better and worse sound as a result of their use. These devices do not store charge, so should have the fastest switching of any rectifiers and the least ability to stimulate RF. I don't know why some folks would experience degraded sound with them.
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Follow Ups
- Minor elaboration to help with Mart's understanding... - Al Sekela 10:33:24 11/03/05 (2)
- had thought the broadcast RFI were Fourier frequenies from hard-switching - Mart 04:59:57 11/04/05 (1)
- Yes... - Al Sekela 10:37:08 11/04/05 (0)
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