PSU/Diode question

iceman · 27th August 2003, 12:22 PM

Hi !

I've got a couple of Diodes: MUR2020 & MUR3060
I wonder wich is the best to use in my PS.
Is it alway best to use the largest/biggest ??

MUR2020:
20A
200V
95ns Reverse recoverTime

MUR3060:
30A
200-600V
35 and 60ns Reverse recoverTime

If you want to know, my amp is about 25W /ch +-25V
My transformer is:

500VA
Primary 230V 50Hz
Secondary 2 x 18 V

janneman · 27th August 2003, 12:36 PM

One other thing to look at is the recovery characteristic. Soft recovery is normally better to avoid switching noise from the diodes. I would expect the 2020 to be soft recovery, but I don't have the data sheet. Other than that, I guess they are both suited.

Jan Didden

Claude Abraham · 27th August 2003, 01:03 PM

Iceman,

It depends on the ac voltage you are trying to rectify. The peak stress on the diode is 2.83 times the rms voltage of the ac waveform being rectified. If the ac voltage is 120 volts rms, then the peak stress is around 340 volts. Allowing for tolerances, a 400 volt diode should be used. A 200 volt diode should be used only if the rms value of the ac is 60 volts or less. I hope this helps.

janneman · 27th August 2003, 02:35 PM

....Claude, he said "2 x 18"...

Jan Didden

iceman · 27th August 2003, 04:30 PM

Thank you for the answer.

I would rectifie (only 2 x18) so i use the 2020.

Gasho · 27th March 2005, 08:57 AM

MUR 3060 have shorter recovery time so it is little faster (letś say better) . You can use a Schottky power diodes , witch are much better for the sound character of audio electronics. Shottkyes are manufactured with max working voltages of 100V.

Upupa Epops · 27th March 2005, 09:38 AM

It's here again - sound of diodes.

Strange world

.

Gasho · 27th March 2005, 12:24 PM

Quote:

Originally posted by Upupa Epops
It's here again - sound of diodes. Strange world .

Strange world with big influence.

Upupa Epops · 27th March 2005, 12:49 PM

If dioedes at PS have big influence on sound, something is wrong, fault isn't in these diodes.

sivan_and · 27th March 2005, 01:11 PM

Gasho wrote:

Quote:

Shottkyes are manufactured with max working voltages of 100V.

WRONG !!
Have seen 600volt types ....

27th August 2003, 12:22 PM	#1
iceman diyAudio Member Join Date: Jun 2003 Location: Gothenburg	PSU/Diode question Hi ! I've got a couple of Diodes: MUR2020 & MUR3060 I wonder wich is the best to use in my PS. Is it alway best to use the largest/biggest ?? MUR2020: 20A 200V 95ns Reverse recoverTime MUR3060: 30A 200-600V 35 and 60ns Reverse recoverTime If you want to know, my amp is about 25W /ch +-25V My transformer is: 500VA Primary 230V 50Hz Secondary 2 x 18 V __________________ "Quis custodiet ipsos custodes?"

27th August 2003, 01:03 PM	#3
Claude Abraham diyAudio Member Join Date: Apr 2003 Location: NE Ohio	re: PSU/Diode question Iceman, It depends on the ac voltage you are trying to rectify. The peak stress on the diode is 2.83 times the rms voltage of the ac waveform being rectified. If the ac voltage is 120 volts rms, then the peak stress is around 340 volts. Allowing for tolerances, a 400 volt diode should be used. A 200 volt diode should be used only if the rms value of the ac is 60 volts or less. I hope this helps. __________________ "We wish to reach the moon, not because it is easy, but because it is hard." John F. Kennedy, 1917-1963, US President

27th August 2003, 04:30 PM	#5
iceman diyAudio Member Join Date: Jun 2003 Location: Gothenburg	Diodes Thank you for the answer. I would rectifie (only 2 x18) so i use the 2020. __________________ "Quis custodiet ipsos custodes?"

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27th August 2003, 12:36 PM	#2
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	One other thing to look at is the recovery characteristic. Soft recovery is normally better to avoid switching noise from the diodes. I would expect the 2020 to be soft recovery, but I don't have the data sheet. Other than that, I guess they are both suited. Jan Didden

27th August 2003, 02:35 PM	#4
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	....Claude, he said "2 x 18"... Jan Didden

27th March 2005, 08:57 AM	#6
Gasho diyAudio Member Join Date: Nov 2004 Location: Zagreb	MUR 3060 have shorter recovery time so it is little faster (letś say better) . You can use a Schottky power diodes , witch are much better for the sound character of audio electronics. Shottkyes are manufactured with max working voltages of 100V.

27th March 2005, 09:38 AM	#7
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	It's here again - sound of diodes. Strange world .

27th March 2005, 12:49 PM	#9
Upupa Epops diyAudio Member Join Date: Aug 2003 Location: Prague,Czech Republic	If dioedes at PS have big influence on sound, something is wrong, fault isn't in these diodes.

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