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Old 9th May 2012, 07:49 PM   #211
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Quote:
Originally Posted by AudioSan View Post
i can't see any advantage over external or main heatsink
On the MUR3020W datasheet, the Vf axis is linear, but the vertical axis is logarithmic scale.
10-15 degrees doesn't make a significant difference in Vf, so mounting the diodes on one heatsink or the other doesn't make the diodes kick in a lot sooner.

But a 15 degree jump in diode die temperature does make a difference current wise.
Take the example of my previous post : 40C or 50C diode temperature means ~0.865A or 1.25A diode current at a Vf of 0.6
One MOSFET would do ~2A drain current, the other nearly 2.5A

10C temperature difference between one location of a heatsink and another isn't that round the bend.
(e.g. EUVL's heatsink measurements in the latest LinearAudio fagazine)
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Old 9th May 2012, 07:49 PM   #212
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Originally Posted by Zen Mod View Post
yup

that's the very jewel of F5T article/project

everything else is "just" upping [voltage/bias/number of outputs] tutorial
Agreed.

And there's nothing wrong with upping voltage/bias/number of outputs. In fact, it's one of my favorite things to do!

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Old 9th May 2012, 07:56 PM   #213
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Quote:
Originally Posted by jacco vermeulen View Post
On the MUR3020W datasheet,.....
cleverfancypancy

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Old 9th May 2012, 07:56 PM   #214
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buzz

context is very important .
Absolutely. I am not in need of the power, but just trying to help with the parameters for those that are, since i have the amp built and can test and talk. Too much talking, sure. Whats that among friends? Diode heat discussion was roundabout way of introducing the importantce of adequate sink. Don't want anyone to underestimate what 4 pairs of oututs @1A with 32V rails will do to a heatsink. Normal amps are sensitive to proper sinking, but in this one, even more so, as we have added another variable that introduces possible instablilty directly related to temperature. It is of great help when you, Andrew, Jacco, FLG and others chime in to help as many of us are just wading in with much less experience. To that i have a
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Old 9th May 2012, 07:59 PM   #215
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Old 9th May 2012, 08:06 PM   #216
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It is of great help when you, Andrew, Jacco, FLG and others chime in to help as many of us are just wading in with much less experience.
Sorry for wading in.

Graeme
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Old 9th May 2012, 08:09 PM   #217
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Sorry for wading in.

Graeme
These were simply more regognizable names on the forum. I like your taste in speakers BTW. Now dont you feel better
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Old 10th May 2012, 04:26 PM   #218
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Quote:
Originally Posted by lhquam View Post
Everything I can find has a minimum order of around $30-$40.
Still sounds fair to me.

I can buy disc spring washers by the piece if i drive up to a Fabory store, nearest to my place is 15 minutes by car.
If i order them online from Fabory, i'd have to buy a hundred minimum, plus mailing cost, company account.

For Belleville washers in the US, you likely need a similar fastener supplier, local, they're not run off the mill parts a general hardware store will have.
(Fabory e.g. has stores only in Grand Rapids and Houston)

trivia : Jean Francois Belleville in France patented these washers +150 years ago
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Old 10th May 2012, 05:31 PM   #219
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Never seena thermostat on the line in a PSU before, so I wa wandering if this was an acceptable one.

LM26CIM5-SPA/NOPB National Semiconductor | LM26CIM5-SPACT-ND | DigiKey

Is this a secondary safety measure for overall temperature n case?
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Old 10th May 2012, 05:45 PM   #220
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Papa is pullin' ya leg (with stat)

that's thermoswitch

normally On
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