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Old 11th December 2012, 12:28 AM   #651
bcmbob is offline bcmbob  United States
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We got light and music.

Built a chassis or stand (your choice) from pieces from other projects. Using four CPU coolers and the bulk of the aluminum angle the temp stays just above room temperature.

The power transistors are insulated with heat transfer tape instead of mica and seem to work as required. I'll keep my eye on them.

The level is very low, but high quality with my test speakers and the amps being fed with a Walkman. After safety burn-in bigger speakers and a pre will be tested.

Still have to devise a cover - maybe plexiglass - and some nice wood trim.

So my introduction to "The World Of Pass" has been fun and productive.

P.S. One of my 18.5 V bricks has a plug that's too big for the sockets I bought so I haven't had stereo yet - but they both sound great. A trip to RS tomorrow will take care of that.
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Old 11th December 2012, 12:31 AM   #652
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looks awesome. If possible, test fet temp vs angle temp to see quality of heat transfer.
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Old 11th December 2012, 12:43 AM   #653
bcmbob is offline bcmbob  United States
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Coming Up - about 40 minutes.
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Old 11th December 2012, 01:27 AM   #654
bcmbob is offline bcmbob  United States
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The heat sinks have a copper plug similar to the one in the photo, but it is raised just enough to prevent the full face to contact. I'll break that down in hopes the fins become more efficient.
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Old 11th December 2012, 01:33 AM   #655
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Not necesarily a problem. It is meant to transfer its heat to fins. Probablt will not improve it any. 50C is ok, just at top of the range.
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Old 11th December 2012, 01:43 AM   #656
bcmbob is offline bcmbob  United States
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Thanks, More tomorrow.
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Old 11th December 2012, 03:01 AM   #657
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Quote:
Originally Posted by bcmbob View Post
The heat sinks have a copper plug similar to the one in the photo, but it is raised just enough to prevent the full face to contact. I'll break that down in hopes the fins become more efficient.
You don't have to break it down, just make sure the interface between the angle bracket and copper needs to be as smooth as possible and have a bit of heatsink grease on the interface. That will increase the heatsink efficiency and likely take the case temp down.
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Old 11th December 2012, 12:38 PM   #658
bcmbob is offline bcmbob  United States
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Thanks guys, but I guess I used the wrong words. By "break down" I meant removing the one or two mils from the copper plug, not removing it. That would add the full surface of the aluminum part of the heat sink.

I use a series of emery papers glued to a piece of granite, ending with 1600 grit so the contact surfaces are almost mirror like when finished. The copper plug does have Arctic Silver applied now, but I'll eventually use the full face. For subsequent projects I do have access to a surface grinder but this one was small enough to do by hand.

Hope to hook up the ACAs to big speakers and a pre later today.
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Old 11th December 2012, 12:49 PM   #659
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Still unnecessary, IMO. Just make sure it has thermal grease and is making good contact.
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Old 11th December 2012, 02:19 PM   #660
bcmbob is offline bcmbob  United States
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Maybe a little trivial, but do you feel a compound like the white grease might be more effective than the CPU stuff I'm using. I'm aware there are proponents of both, but personally haven't noticed a lot of difference in the computer cooling projects. I'm going to order some mica pads to replace the heat transfer tape and can add what's recommended to the order.
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