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I read some posts mentioned about putting stacked film cap to bypass diode. What is it for? Will it has better result than not bypassing? Can I use other types of capacitor such as silver mica instread of stacked film?
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A good read.
Nelson Pass wrote a great article about bypassing diodes and diode bridges. You can find it through a web search. Bypassing a diode with a smaller value capacitor is an attempt to route the switching noise generated by the diode to ground and away from the signal feed. If you replace the OEM diodes with Hexfred soft recoverys or Schottky diodes, you can improve the sound even more. Be aware that you may have to go to Cree diodes (Parts Connexion) to get higher voltages. Also, Hexfreds and Cree diodes are very much more expensive than your OEM diodes. Also, be sure to replace with same (or more) amperage and voltage. To find this, type the part number into a search engine and it should come up with a description of the diode. Good Luck!
LBNL and IIRC SR is not equivalent to FR.
Note that a post in response is preferred.
Warmest
Timothy Bailey
The Skyptical Mensurer and Audio Scrounger
And gladly would he learn and gladly teach - Chaucer. ;-)!
'Still not saluting.'
So,
Slow recovery is not the FR in FRED:
So, why do some guys swear by FREDs in PS designs?
Too much is never enough
Hi pictureguy,
FRED = Fast Recovery Epitaxial Diode
HA
I looked up FRED.....
Vishay, who was at one time an IR technology partner....and boy, did we build a lot of stuff FOR them under contract, lists FRED devices as 'Soft Reverse Recovery'.
So, too, does IR.
I don't understand the HA?
Too much is never enough
snubbing slows rectifiers down.
IIRC just a cap would do with a FR Hexfreds.
Note that a post in response is preferred.
Warmest
Timothy Bailey
The Skyptical Mensurer and Audio Scrounger
And gladly would he learn and gladly teach - Chaucer. ;-)!
'Still not saluting.'
Thanks,do you mean this article?
http://sound.westhost.com/power-supplies.htm
It said using 100nf to bypass diode. I searched from aa, people recommended 0.01uf. Does different value have different effect to audio sound?
I would like to bypass my Cree diodes (rectifier) in HD player.
It's a good read.
Note that a post in response is preferred.
Warmest
Timothy Bailey
The Skyptical Mensurer and Audio Scrounger
And gladly would he learn and gladly teach - Chaucer. ;-)!
'Still not saluting.'
Just curious:
I believe HEXFRED is trademarked by IR?
I worked for IR for years....making among other things HEXFRED diodes. The 'FR' stands for 'fast recovery', right? How does that play into 'soft recovery'?
BTW, ours were made using an Epi substrate.(the 'E' in FRED) Very expensive start material, but we'd made I don't know how many.....certainly in the hundreds...on a 6" wafer.
Given the current state of semiconductor manufacture, these are 'commodity' parts, the only thing to drive up the price is short manufacturing runs and low demand.
Too much is never enough
"How does that play into 'soft recovery'?"
I think the deal is just less stored charge which reduces both Trr and spike energy. "Soft recovery" appears to be another name for "Fast recovery", same characteristic.
Regards, Rick
I worked for IR for years....making among other things HEXFRED diodes. The 'FR' stands for 'fast recovery', right? How does that play into 'soft recovery'?
BTW, ours were made using an Epi substrate.(the 'E' in FRED) Very expensive start material, but we'd made I don't know how many.....certainly in the hundreds...on a 6" wafer.
Don't confuse these guys with facts. They know what they think they hear.
Could you please elaborate? I miss your meaning.
my bad?
BTW, the HEXFET is patented take on the MOSFEET power transistor. Carver used IR devices in some of his SunFire gear.....Maybe from the IGBT line.
Too much is never enough
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