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Well the upgrade to Nichicon KW was fab. I'm seeing some soft recovery diodes with radial leads on the net. This is a 3A 13.8V machine with a 5A fuse. Can anyone tell me what soft recovery diodes would be suitable. Wouldn't mind ultra or hyper fast. This is what happens when one enters semi retirement. Thanks, Tweaker
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The simplest thing to do is to try to read the number on your present diodes. Then go to the internet and Google the number. That will tell you what value diodes you've got now. Then just buy the equivalent value (voltage and current) in any type you want. "UF" diodes are the best bang for the buck. Schottky diodes are the best, period. But Schottky diodes have a very low forward voltage drop. Thus, the output voltage from the Trip Lite might go up a bit with Schottkys inside. This could cause a problem, unless the output V is regulated. (I know nothing about the Trip Lite PR3.) No, there is nothing at all to be gained by using higher current- or voltage-rated diodes, above the original values.
This is a regulated supply. This means that Schottkies can be used in total safety correct? Thanks, Tweaker
I am only going to say "probably". Check the actual voltage at the output, under load, before you do anything. Then check it again, under load, after you've changed the diodes. Then you'll know whether you have any issue. Most times, the absolute value of the voltage right out of the power supply is not super critical. Depends upon what is being powered.
Ok Lew, Thanks So here we have it. Schottkys probably ok with regulation and soft recovery and Ultra fast definitely ok, right? Do you have a particular Ultra fast you like that equals or comes close or betters Schottkys? Could be right about overdoing it on the ratings. I don't have enough experience with diodes to really tell. Tweaker
I am not absolutely certain, but I think the term "UltraFast" attached to diodes coded as "UFXXXX", where the X's are a numeric code, indicates diodes that all come from the same source. Anyway, I know of no qualitative differences among UF diodes based on source.
I was hoping the specs would tell what would be needed. I have to desolder a couple of things to see the diodes. Be nice to know what devices people have tried and like. Lots of stuff on ebay... It's been my experience that higher than necessary rated devices sound better. Just like larger power cord wire sound better than thinner wire even though the thin wire can deliver the current safely. Higher rated bipolar output devices sound better. It's extremely likely that high current diodes would sound better, IMO. For some reason I seem to be having a difficult time getting this point across. Tweaker
You are entitled to your opinion, but what you say is not necessarily true. Within a given type of diode, constructing the diode to tolerate higher current can require some sacrifice in terms of noise generated by the diode itself. I don't think you want to wildly exceed the current rating needed, in this case.
Lew, When I look for noise stats on diodes I don't see any. Is there a stat that one can look at that you can infer higher or lower level of noise in a diode?? Thanks, Tweaker
NT
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