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Old 4th February 2004, 01:31 PM   #1
Alcaid is offline Alcaid  Norway
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Default 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)
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Old 4th February 2004, 01:36 PM   #2
UrSv is offline UrSv  Sweden
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IMHO, Yes.

However, I would have chosen something beefier myself.
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Old 4th February 2004, 01:44 PM   #3
Alcaid is offline Alcaid  Norway
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Any suggestions to other discrete diodes to use that can handle more current, and are "audiophile"
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Old 4th February 2004, 01:49 PM   #4
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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?
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Old 4th February 2004, 01:49 PM   #5
Alcaid is offline Alcaid  Norway
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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.
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Old 4th February 2004, 01:49 PM   #6
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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.
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Old 4th February 2004, 01:52 PM   #7
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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.
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Old 4th February 2004, 01:53 PM   #8
Alcaid is offline Alcaid  Norway
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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.
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Old 4th February 2004, 01:58 PM   #9
Alcaid is offline Alcaid  Norway
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What will happen with the rectified DC voltage if one (or more) diode gets damaged by a to high current?
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Old 4th February 2004, 02:11 PM   #10
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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.
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