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Old 1st November 2012, 02:04 PM   #621
bcmbob is offline bcmbob  United States
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Default Cool Amp (BLAT)

Finally completed all major aspects of the liquid cooled build. I'm taking a sabbatical at this point because I can't stand to even look at a drill, tap or file any more.

The format here was to make two self-contained packages with provisions that any possible leaks will flow away from the amp. That was accomplished with the realization that an airtight system will negate the gravity effect of a liquid, allowing the reservoir to be located anywhere.

I took lots of pictures and will post a separate complete build thread in a few days. Till then here are a few pics of the result.

All the signal in and out wires are of equal length. These are the 120VA toroids from ApexJr powering the FE beta builds. Didn't have the courage to tap the FEs for 12 VDC for the pump and fans so I installed a socket for a regular wall wart for now.

In the third photo the complete cooling system is visible with all components below the top of the aluminum base. For those of you who may be less adventurous (read - old fuddy duddies) I did make a mounting hole matched conventional cooling module that replaces both the plates and heat sinks.

Made a pasteboard template of a possible cover that I'll transfer to metal eventually. It will most likely have a panel that covers the heat sinks completely. Been hanging on to the two Zebrawood burls for twenty years - this may be where they end up.

The FEs are working great with DC readings ~ 12 - 15 mV. The output is clear with no hum or distortion - though Marra did put the hex on me and one LED stays off. The speaker posts will accept spades or bare ends and will work just as good if not better than bananas.

Been a fun project and I post some temp data on the build thread.
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Last edited by bcmbob; 1st November 2012 at 02:10 PM.
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Old 1st November 2012, 02:09 PM   #622
Marra is offline Marra  United Kingdom
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I did'nt realise it was catching
Nice work by the way.
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Old 1st November 2012, 02:13 PM   #623
AndrewT is online now AndrewT  Scotland
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I am going to be more than a little cynical and ask if you have performed the ultimate test of a multi-channel power amp?

Have your connected up all the interconnects to all the available inputs and commoned all the remote end barrels (signal grounds)? And then measured the hum at the output.

I do agree, that is some achievement in packaging !
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Old 1st November 2012, 02:27 PM   #624
bcmbob is offline bcmbob  United States
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Marra, thanks. You got me.

Have you got any good news? It sounded like you were just about there a few posts ago.

Andrew, I'll get back to your qusetion in a few minutes after I switch things around. For testing I used my normal DIY 3" bench speakers and a Walkman as a source. I configure a full system and report back.
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Old 1st November 2012, 02:48 PM   #625
Marra is offline Marra  United Kingdom
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Been a bit under the weather so not as yet. I've to strip out the Peter Daniels GC from its case to fit the FE so by earlier next week hopefully.
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Old 1st November 2012, 03:02 PM   #626
bcmbob is offline bcmbob  United States
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Andrew, can you hear that??

It's golden FE nectar with just a touch of Sunflower juice.

The system sounds perfect so far - no hum no distortion. However there was a got-cha that I must divulge. Since this is my first chipamp build , in my haste I didn't apply new paste on the chip and check the mounting bolt for tightness on one module. The result was of course a protection trip. Easy to fix but I blaming it on you.

So far so good. I'll use the new setup for the rest of the day and report back.

Mini 2496 - BNC feed
DIY silver interconnects
DIY Cat 6 speaker cables
Sunflower Speakers.
Attached Images
File Type: jpg 20121101_103028.jpg (161.9 KB, 152 views)
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File Type: jpg 20121101_104147.jpg (222.1 KB, 107 views)
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Old 1st November 2012, 03:08 PM   #627
AndrewT is online now AndrewT  Scotland
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God gave us men broad shoulders. That is the reason we can take the blame every time someone shouts: "that's your fault"

So, now I would like you to draw out in detail, all the grounding and where each grounding wire terminates at BOTH ends.

Post it so we can all learn.
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Old 1st November 2012, 03:15 PM   #628
bcmbob is offline bcmbob  United States
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Will do and post later.
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Old 1st November 2012, 09:36 PM   #629
bcmbob is offline bcmbob  United States
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Someone who isn't familiar with the size of the FE boards commented the BLAT looks enormous. Here is pic for perspective.

D=7", W=10", H=7.25"
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File Type: jpg 20121101_152037.jpg (132.4 KB, 124 views)
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Old 1st November 2012, 10:29 PM   #630
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Bob,

It looks really great. My questions are about the cooling fluid. Is the reservoir in the bottom or not in the pictures? Also, how do you connect to the heat exchangers. It kind of looks like safety wire around a hose, but I can't see clearly.

It is a very interesting concept. I wish there was a good way to measure distortion or something on your units. I can imagine we would all learn something if you could vary the flow so that the chip amp temp could be held at different temps while under the same electrical condition. It would be neat to understand how much temperature affects the output. I mean more than what we get from the data sheet. That, combined with hearing any difference would be cool.

Jac
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