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Custom Bridge Rectifier on a preamp power supply

I need an advise from any memebers with experiences in custom bridge rectifier. I am thinking about building my own bridge rectifier. Can i mix two different diode ( 1 pair of Fred and 1 pair of Schottky)?? From my expereinces A Fred diode gives me more of a relax sounding( laid back, imaging are much laid back) and a Schottky diode ( dynamic, was more of in your face sounding) too much of forward sounding. To compomise, is it possible mixing two pair of diode together? Any advise are much appreciated!
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Showing 2 responses by kijanki

kijanki's avatar
kijanki
3,575 posts
 
Main problem of linear power supply is switching at the max voltage when diodes become polarized in opposite direction. Current drops rapidly to zero and for a moment diode conducts in opposite direction to snap back to zero. What you need is a so called "Soft" diode - a fast diode with slow recovery time like Hexfreds. Diodes that snap back too fast produce ringing that is polluting supply voltage and can couple to any LC circuit. I would not mix diodes. Schottkies have lower forward drop voltage and usually much lower max. reverse voltage.
kijanki's avatar
kijanki
3,575 posts
 
Atmasphere, not only power transformer but also inductance of electrolytic caps. There are snubbers, capacitors parallel to diodes etc. but the best is to start with a soft diode. Inductance of big electrolytic caps is in series with the output. People often make mistake by adding non-inductive caps in parallel, creating parallel resonant circuit. So called linear power supply is in reality a primitive switcher and has so many problems that should be already obsolete and replaced by quiet SMPS.
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