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Old 3rd June 2013, 10:46 PM   #1041
Eric is offline Eric  United States
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Cool! I think that one wins the award for the most compact chassis! Nicely done.
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Old 3rd June 2013, 11:02 PM   #1042
billyk is offline billyk  United States
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Wow! That is one sweet looking set!
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Old 4th June 2013, 12:07 AM   #1043
Variac is offline Variac  United States
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I'd be very proud of those monoblocks if they were mine! In fact I believe I have a couple of very similar heatsinks.. and now I know what to do with them!
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Old 4th June 2013, 12:09 AM   #1044
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Oooo La La.
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Old 4th June 2013, 07:32 AM   #1045
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Does any know if I can use the LU1014D (used in Zen V9) for this circuit? Any modification is required if I want to use this?
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Old 4th June 2013, 08:08 AM   #1046
Zen Mod is offline Zen Mod  Serbia
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whenever you think of LU , take cascode as native part of it

feel free to try it
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Old 4th June 2013, 11:55 PM   #1047
bcmbob is offline bcmbob  United States
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These are my readings with the PC coolers on my ACAs:

Ambient = 27 C

Tj = 44 C

44 - 27 = 17 C raise

17 / 20 = .85 c/w

I think I can do better because I used PC CPU heat transfer tape to mount the transistors. I now have some mica spacers I can install. I'll post again when I get it done.
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Old 5th June 2013, 02:17 AM   #1048
Eric is offline Eric  United States
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Hi Bob,

A 17c rise over ambient is pretty decent. This is very similar to the thermal behavior of the ACA on the sinks that sell with the kit or the 2U sinks that were available in the DIYAudio store. The one that my daughter and I built sees a 18-19c rise and is quite comfortable to the touch (not too hot at all). For the thermal interface, I used Begquist K-10 SilPads. Years ago, I got my hands on a 4" by 4" sample sheet that I cut to size for my needs.
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Old 5th June 2013, 10:09 AM   #1049
bcmbob is offline bcmbob  United States
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That's funny - years ago, I bought 2" X 18" roll of double sided heat transfer tape for computer building, and these were the last four pieces I could salvage.

BTW, I placed the probe on the thick web of the heat sink and not on the thin fins. I'll do both next time.
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Last edited by bcmbob; 5th June 2013 at 10:11 AM.
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Old 20th June 2013, 03:24 PM   #1050
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I bought the kit from the store and have decided to build a linear supply with CLC filter for it as a learning effort.

While researching the design and picking an inductor, I've run some simulations and determined that the size of the inductor really doesn't affect the waveform shape that much, so whether I pick a common value like 2.2mH or go up to something like 8mH, it serves the purpose. But the value does clearly affect the resonance frequency, and therefore the effectiveness of the filter at 120Hz.

I read somewhere the resonance frequency should be below 10Hz but this statement was made in the context of a supply for a tube amp, which is obviously a different animal. Using the standard formula for LC resonance I came up with 34hz for 2.2mH and 17Hz for 8.5mH.

Question I have is this: do I really need to keep the resonance below 10Hz or some other value? Or is not a factor for the ACA (or any transistor amp design)?
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