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Old 16th April 2018, 10:48 PM   #1001
wtl is offline wtl  Australia
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Thank's for the compliments.
Heatsinks are from Conrad MF350-151.5,Overkill as they barely get warm but who knows what "EVIL" plan Michael has in store for MO-FO Mk2.
Maybe a couple of these critters pictured.

And a shot with the lids on.

Steve.
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Old 17th April 2018, 02:50 AM   #1002
Eric is offline Eric  United States
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Very nice build! I was thinking you were constructing these in the "Classic DIY" style - that of over-engineering! I'm also a HUGE fan of wooden chassis - I like to make stuff look more like wooden furniture that can blend into the decor a bit. I see you've also used my favorite router bit - a 1/2 roundover. I use that bit on just about every project I make...
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Old 17th April 2018, 06:24 AM   #1003
wtl is offline wtl  Australia
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Thank's Eric,
Being that i'm a worn out carpenter i can't help but use timber.
As for over-engineering i'm not sure there is such a thing as too much heat sinking!!!

Steve.
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Old 18th April 2018, 10:45 AM   #1004
zoka959 is offline zoka959  Serbia
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Can ACA be used to drive MoFo ?
Zoran
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Old 18th April 2018, 11:02 AM   #1005
Zen Mod is online now Zen Mod  Serbia
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overkill

make Mini ACA , with IRF510 and cca. 50mA Iq , with 24 oe , even better , 30V rail
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Old 18th April 2018, 02:34 PM   #1006
bloozestringer is offline bloozestringer  United States
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Newb question since I’ve never built a SS amp from scratch. How does one determine the correct size of heatsink to use? I’d like to give this amp a go, but am unsure how to determine size heatsink to get for either the 19v or 24v. I know there is a minimum recommendation in the write up, but I don’t know how that is determined.

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Old 18th April 2018, 03:55 PM   #1007
zoka959 is offline zoka959  Serbia
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ZM,even if I use MoFo in bridge form ?
If it is still overkill and must use irf510 did I have to change passive components ?
Multo obligato
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Old 18th April 2018, 04:52 PM   #1008
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MoFo in bridge demands balanced pre
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Old 18th April 2018, 05:05 PM   #1009
6L6 is offline 6L6  United States
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Bloozestringer -

In the article Mike says, "The device dissipation will be pretty close to your power supply voltage times the idle current. So, for the 19V, 1.7A example, we need a heatsink that can dissipate 32 watts with no more than a 25C rise above ambient temperature. That’s .78C/W, which I consider to be the minimum figure. I will award bonus points if you use oversized heatsinks. A lot of beginner projects run into trouble because of inadequate heatsinking, and using big heatsinks just makes life easier."

So... in english, that means a fairly big heatsink. Also of note, the smaller the number in the heatsink temp/watt coefficient the better.


Were I to build them I'd use a 4U 300mm heatsink from hifi2000, as it's more than big enough and I have them sitting on my shelf.

This would work beautifully as you'd need at least 4" height to keep the choke in the chassis - http://www.heatsinkusa.com/10-080-wi...inum-heatsink/

As would this - http://www.heatsinkusa.com/8-000-wid...inum-heatsink/

(And yes, you are reading that correctly, the 8" has a better rating than the 10", mainly because the fins are deeper. At a height more than 3" they are both more than enough for the job.)
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Old 19th April 2018, 12:43 AM   #1010
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Thanks. Now I see the math. Is the target typically a 25C rise above ambient?
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