Hi,
This question had been asked a long time ago (https://www.diyaudio.com/community/threads/rectifier-diodes-upgrade.139457/) but it did not get extensive replies.
I am looking for a good upgrade of the standard 1N4001 rectifier diodes (to be located in a DAC power supply), I assume a Shottky and fast recovery diode.
The above mentioned link talks about the 1N5819, but there may be other (better ?) alternatives...
What are the best according to your expertise ?
Thank you very much,
This question had been asked a long time ago (https://www.diyaudio.com/community/threads/rectifier-diodes-upgrade.139457/) but it did not get extensive replies.
I am looking for a good upgrade of the standard 1N4001 rectifier diodes (to be located in a DAC power supply), I assume a Shottky and fast recovery diode.
The above mentioned link talks about the 1N5819, but there may be other (better ?) alternatives...
What are the best according to your expertise ?
Thank you very much,
Use UF series, or leave it alone if it is at mains frequencies.
Schottky diodes are intended for kHz and higher frequencies, not efficient at mains frequencies, though some claim it makes a difference, most people call it snake oil.
In a DAC, there will mostly be a SMPS, and on the secondary side, Schottky diodes are used for high frequency rectification of the Ferrite transformer low voltage AC output.
Schottky are already there, the 4001 must be on the primary side.
No point in doing anything.
You could make a regulated linear supply, but in fact SMPS gives very good regulation.
So until you have a problem, enjoy the music.
Schottky diodes are intended for kHz and higher frequencies, not efficient at mains frequencies, though some claim it makes a difference, most people call it snake oil.
In a DAC, there will mostly be a SMPS, and on the secondary side, Schottky diodes are used for high frequency rectification of the Ferrite transformer low voltage AC output.
Schottky are already there, the 4001 must be on the primary side.
No point in doing anything.
You could make a regulated linear supply, but in fact SMPS gives very good regulation.
So until you have a problem, enjoy the music.
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What exatly do you want/need to be better? How is the 1N4001 not meeting your expectations?
There was an article by Mark Johnson, at Linear Audio magazine, dealing with switching noise and ringing introduced by rectifier diodes. Differences among various diodes were large, with 1N400x being among worst. UF4004 was better but not great either. Among best were Vishay SBYV27-200 and SBYV28-100-E3.
If diodes to be replaced are inside DAC embedded power supply, it’s likely that DAC design deals with their noise at voltage regulators or noise generation is prevented with a snubber. Replacing them with better ones does not guarantee to bring performance improvement.
If diodes to be replaced are inside DAC embedded power supply, it’s likely that DAC design deals with their noise at voltage regulators or noise generation is prevented with a snubber. Replacing them with better ones does not guarantee to bring performance improvement.
The article in the link above is about diode noise in linear (transformer based) supplies, bear that in mind, does not apply to SMPS.
Correct. Also correct: the 1N4001 rectifier diode mentioned in post #1, does not apply to SMPS either.
1N4001's maximum reverse voltage rating is only 50 volts. However an AC-to-DC SMPS requires at least 200 volt diodes when the AC mains is 115V RMS, and at least 400 volt diodes when the AC mains is 230V RMS.
Conclusion: the power supply discussed in post #1 is not an AC-to-DC SMPS.
True: it is a linear P.S.
Thank you very much to all of you, and particularly "tombo56": I will test the Vishay SBYV27-100 !
By the way, does any of you know the Trr of the 1N4001 ? it is not clearly mentioned in the datasheet...
Diodes Inc datasheet of 1N400x shows T_RR in the table on page 1. Various people here on diyAudio have claimed that all "bog standard Silicon diodes" have the same T_RR , whose value is the number in this table.
Have some fun and look up the datatasheet for the diode called GP30J .
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Have some fun and look up the datatasheet for the diode called GP30J .
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Mark,
120 VAC is 340 volts peak to peak. If you charge a capacitor thingie to the AC peak and the the line reverses you will see 340 volts across the diode. If using four diodes in a bridge then the most each diode needs to withstand is half of that. (Assuming diodes that are reasonably well match. Mixing up types or even manufacturers’ models may change that.)
Way back in college working on a large power supply the faculty member in charge was most disappointed that a diode rated at 10,000 peak inverse volts failed when he turned the AC source up to only 3,600 volts AC. Just a hint 10 amps at 3,600 volts will announce such a failure!
120 VAC is 340 volts peak to peak. If you charge a capacitor thingie to the AC peak and the the line reverses you will see 340 volts across the diode. If using four diodes in a bridge then the most each diode needs to withstand is half of that. (Assuming diodes that are reasonably well match. Mixing up types or even manufacturers’ models may change that.)
Way back in college working on a large power supply the faculty member in charge was most disappointed that a diode rated at 10,000 peak inverse volts failed when he turned the AC source up to only 3,600 volts AC. Just a hint 10 amps at 3,600 volts will announce such a failure!
BYV series is a nice pick. It's cheap and does the job. No need to spend more for fancy FREDs or whatever. Just add a RC snubber on the secondary for the finishing touch.
Yep. I assumed that the SMPS uses a bridge rectifier on the 120V RMS mains, therefore the peak reverse voltage is 340/2 = 170 volts. All SMPS's I've ever seen, do contain a bridge.
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These days I just use inexpensive Schottkys, because they don't get as hot as soft recovery diodes at the same load current. Thus they don't heat up the nearby electrolytic capacitors and degrade their service lifetime. The transformer snubber completely eliminates ringing, even for the very worst diodes, so we are free to use a different selection criterion. My criterion is low-cost-and-low-forward-voltage-drop-at-max-current.
Here's some TO-220 diodes on heatsinks (front and back), heating up the nearby electrolytic capacitors (vertical cylinders). Ick.
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OP is asking about a DAC, hopefully that won't use enough power to make the diodes toasty.
Agree with Schottkys for power amps, they run cooler. But for some, leakage is a problem, and makes them waste as much power as normal diodes...
Agree with Schottkys for power amps, they run cooler. But for some, leakage is a problem, and makes them waste as much power as normal diodes...
I've been using 1N4007's for typical replacements, (1A) or for heavy loads the 1N54xx's (3A).
Never had any issues in decades.
Just buy name brands.
Never had any issues in decades.
Just buy name brands.
I would love to know what real problem is the OP trying to "solve".
11DQ10 if 100V max is no issue. Unfortunately out of production (I think) but available. I see vous etês voisin en France so I can send you a 4 or 8 if you can't find them.
1N5819 is only 40V and too high leakage. Too old for today.
1N5819 is only 40V and too high leakage. Too old for today.
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Mouser.com has 16 different part numbers, in stock and on the shelf today, which have these features
Here is a link to all 16 Schottkys , sorted by price. Pay special attention to Mouser part number 511-STPS3150RL -- it's a 3A , 150V Schottky for $0.71 in qty=1. I designed its little brother (1A, 150V) into the "Marauder" and "Dreadnought" PCBs & kits that the diyAudio Store is selling. Works a treat.
- Schottky rectifier
- 1 ampere or higher
- 100 volts or higher
- thru hole pkg with axial leads
- mfg by Diodes Inc, On Semi, Vishay, or ST Micro. No others
- still in active production today
Here is a link to all 16 Schottkys , sorted by price. Pay special attention to Mouser part number 511-STPS3150RL -- it's a 3A , 150V Schottky for $0.71 in qty=1. I designed its little brother (1A, 150V) into the "Marauder" and "Dreadnought" PCBs & kits that the diyAudio Store is selling. Works a treat.
Why buy from Mouser when you can get them for free? 🙂 No minimum order quantity and no "free" handing over of packets to customs, import taxes etc.
https://eu.mouser.com/datasheet/2/427/Vishay_11DQ09,10(M3)-1-1211586.pdf
https://eu.mouser.com/datasheet/2/427/Vishay_11DQ09,10(M3)-1-1211586.pdf
- Schottky rectifier
- 1.1 Ampère
- 100 Volts
- through hole DO-41 version with axial leads
- produced by Vishay
- Sent within Europe => true green
- Out of production so exclusivity guaranteed
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I send you a PM, and I start a new thread regarding the upgrade of a 2W04 bridge rectifier (circular form factor)
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