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In Reply to: RE: Request for FRED substitution help posted by MWE on March 28, 2015 at 16:23:31
Do a search for IXYS HyperDYNfred. They are beyond amazing. I've put them in everything, that is not running off batteries. Digikey and Mouser have stock.
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Thanks! There are two values listed at DK- can you advise as to which is best for this sub?
"The thought that life could be better is woven indelibly into our hearts and our brains" -Paul Simon
IXYS makes Hiperfred and HiperDYNfred. Note the "DYN". These are the best, and the one's you want. See here:http://db.audioasylum.com/mhtml/m.html?forum=tweaks&n=69593&highlight=IXYS&r=&search_url=%2Fcgi%2Fsearch.mpl%3Fforum%3Dtweaks%26searchtext%3DIXYS
Link below is for the "DYN" that Digikey sells.
http://www.digikey.com/product-search/en?s=16492&FV=fff40015%2Cfff8007f&k=IXYS&mnonly=0&newproducts=0&ColumnSort=0&page=1&stock=1&quantity=0&ptm=0&fid=0&pageSize=25
Edits: 03/28/15
nt.
"The thought that life could be better is woven indelibly into our hearts and our brains" -Paul Simon
The onboard regs can deliver 1.5a max. 15a diodes would be way more than needed.
On another note, the two main filtering caps appear to be nothing to write home about. Since you ARE ordering from Digikey. Panasonic or Rubycon would be a step up...
Larger diodes have slower rise times
I had put Nichicon UPWs on the list (not placed quite yet)- replacing all 'lytics since this unit is probably twenty years old...would Panas/Rubys be much better?
Mark in NC
"The thought that life could be better is woven indelibly into our hearts and our brains" -Paul Simon
I recommended the Panasonic or Rubycon due to my personal use, plus ripple/impedance specs. Nichicon UPW are not rated as well, however the sound they provide may be preferred/best. Caps are so subjective... Your ears will decide.
Sounds good. Thnx,
Mark
"The thought that life could be better is woven indelibly into our hearts and our brains" -Paul Simon
I see these rectifiers for sale on eBay for $1 a piece, lots of ten. They have the 200 volt units, which should be fine for anything but high wattage amplifiers, I would think. I used 600v HEXFREDs once in a 200-watt per channel amplifier. Obviously, it's good to have a wide margin of error.
I'm ready to buy some if one of the posters says it is so great. I have some power supply boards with what appears to be hexfreds, but I don't know which type they have.
You may know this and just have neglected to take it into account, but Watts are the unit of Power, where Power = volts X amperes. So, your use of a "600V" Hexfred in a 200W per channel amplifier is not necessarily overkill at all, because we are not told about the current requirement. One would need to know the current draw of the amplifier and the current rating of the 600V diode to have any idea of "overkill". Nor is it necessarily a "wide margin for error" with respect to voltage rating. To rate the required voltage limit of the diode, you need to know the voltage developed across the secondaries of the power transformer, which AC voltage is rectified by the diode(s) that follow. 600V would be OK, more or less, if the AC voltage at the secondaries is ~300V or less, preferably.
Edits: 03/31/15
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