MUR860 rectifying bridge question

Alcaid · 4th February 2004, 12:31 PM

Would the MUR860's be able to rectify a 300VA 2x24VAC toroid in a dual rectifying bridge setup? Would it need cooling? The MUR860's have an IF(AV) of 8A, and the toroid will give (150/24=) 6,25A per secondary.

What do you think?

It is going to be used in a subwoofer-amp with linkwitz transform circuit, so I think the bridges will have plenty to do (because of the extra gain at lower freqencies)

UrSv · 4th February 2004, 12:36 PM

IMHO, Yes.

However, I would have chosen something beefier myself.

Alcaid · 4th February 2004, 12:44 PM

Any suggestions to other discrete diodes to use that can handle more current, and are "audiophile"

UrSv · 4th February 2004, 12:49 PM

Well, for sub use I would not myself worry to much about "Audiophile" rectifiers. Maybe any brand MUR1560/MSR1560 or the ISL9 series from Fairchild could do?

Alcaid · 4th February 2004, 12:49 PM

Anyone tried the MUR3020PT, good for 30A

http://www.onsemi.com/site/products/...0.html?tax=553

edit: ops... looked in the datasheet, it's not 30A, but 2x15A.

peranders · 4th February 2004, 12:49 PM

What is the load? If you read between the lines the diode can 16 A under some circumstances.

I have chosen these in my rectifier bridge but I can't really figure out how much those diodes can take in a rectifier application.

peranders · 4th February 2004, 12:52 PM

Quote:

Originally posted by Alcaid
Anyone tried the MUR3020PT, good for 30A

http://www.onsemi.com/site/products/...0.html?tax=553

edit: ops... looked in the datasheet, it's not 30A, but 2x15A.

Works probably alright.

EDIT: but you can connect the diodes in parallel and get some more than 15 A.

Alcaid · 4th February 2004, 12:53 PM

Quote:

Originally posted by peranders
What is the load? If you read between the lines the diode can 16 A under some circumstances....

I haven't buildt the amp yet, but it's intended for a 4ohm 12" sub.

Alcaid · 4th February 2004, 12:58 PM

What will happen with the rectified DC voltage if one (or more) diode gets damaged by a to high current?

Peter Daniel · 4th February 2004, 01:11 PM

Quote:

Originally posted by Alcaid
What will happen with the rectified DC voltage if one (or more) diode gets damaged by a to high current?

Usually a fuse on primary blows off. I had the bridges blowing on my A75 amp (because of inrush current) and this was always the case, no damage to amp or speakers.

4th February 2004, 12:31 PM	#1
Alcaid diyAudio Member Join Date: Nov 2003 Location: Klepp	MUR860 rectifying bridge question Would the MUR860's be able to rectify a 300VA 2x24VAC toroid in a dual rectifying bridge setup? Would it need cooling? The MUR860's have an IF(AV) of 8A, and the toroid will give (150/24=) 6,25A per secondary. What do you think? It is going to be used in a subwoofer-amp with linkwitz transform circuit, so I think the bridges will have plenty to do (because of the extra gain at lower freqencies)

4th February 2004, 12:36 PM	#2
UrSv diyAudio Member Join Date: Jan 2002 Location: Sweden	IMHO, Yes. However, I would have chosen something beefier myself. __________________ UrSv Those who say it can't be done should not stop those who are doing it.

4th February 2004, 12:49 PM	#4
UrSv diyAudio Member Join Date: Jan 2002 Location: Sweden	Well, for sub use I would not myself worry to much about "Audiophile" rectifiers. Maybe any brand MUR1560/MSR1560 or the ISL9 series from Fairchild could do? __________________ UrSv Those who say it can't be done should not stop those who are doing it.

4th February 2004, 12:49 PM	#6
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	What is the load? If you read between the lines the diode can 16 A under some circumstances. I have chosen these in my rectifier bridge but I can't really figure out how much those diodes can take in a rectifier application. __________________ /Per-Anders (my first name) or P-A as my friends call me

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4th February 2004, 12:44 PM	#3
Alcaid diyAudio Member Join Date: Nov 2003 Location: Klepp	Any suggestions to other discrete diodes to use that can handle more current, and are "audiophile"

4th February 2004, 12:58 PM	#9
Alcaid diyAudio Member Join Date: Nov 2003 Location: Klepp	What will happen with the rectified DC voltage if one (or more) diode gets damaged by a to high current?

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