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I am working on a system. Here is a 3d model of it. To start off there will be: 2 B3`s with sidecar and sp-dif switch 1 BNC, 1 RCA and 1 Optical 1 Exau2s (4th pos on the switch module selects the external i2s source on the sidecar) 2 Legato 3.1`s with buffers 2 Placid HD BP (with taller heatsinks) 2 LCDPS (one to power control systems etc, the other to the dac`s) Later on a couple Ventus might find its way into the case so I want the case to be designed with that in mind (2x ventus boards and additional Placid`s). Hifiduino based control and lcd (not during first tests though). I have kept the wires as short and kept as far from each other as possible by mounting the modules horisontally. Power at the bottom and i2s and signal at the top of the case. Here is the preliminary model. It will be a work in progress for quite some time and suggestions are welcome. Thanks in advance :)  
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I have to say it looks like well thought out concept. I have not had time to look too closely, but my initial take is that it should be very very good.
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Thank you for the feedback. I am for the time being looking at other control options. I would have preferred it all to be Twisted Pear so if the AC2 is nearing it`s completion or at least at the near end of the test phase then I`ll use that. I think I read it in a thread at diyaudio that you are done with the hardware part of the ac2. So I`ll hold off on the arduino based control part untill I see what you come up with. As for the dac itself there are a few things I am thinking of atm. 1. Are the boards in my model too close together (noice issues)? 2. Can I mount the tridents that close to the board with only about 5mm clearence or will this cause issues? Digital and analog part: http://sketchup.google.c...80d810a177a6ddd614bc0906Power and control: http://sketchup.google.c...7bb5a4fb77a6ddd614bc0906Edit: updated the model Edited by user Saturday, March 10, 2012 4:36:15 PM(UTC)
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Started putting it together. I seem to have forgotten to order 12mm Metric distances. So that needs to be ordered. Was planning on using the Tridents that was bought a while ago, I think they are V1, but so far it is open. Should I use the updated V3? gwikse attached the following image(s):  DM B3.jpg (237kb) downloaded 100 time(s).You cannot view/download attachments. Try to login or register.
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Some testing. I have put one half of the dac`s together. This will eventuelly be the right channel. So far I have tested it with TTL level optical input and it lock on signals ranging from 16bit 44.1 up to 24bit 96 just as expected. All dip switches are set to off atm. The heatsink closest to the camera is hot as .... too hot to hold for any lenght of time, but not hot enough to leave a mark (note that my fingers are hardened from playing guitar as well as from testing blood sugar for the last 30 years). Will place a temperature probe on it later on, when I can place it closer to my computer (with it`s temp probes that can be logged). gwikse attached the following image(s): Placid HD out stable.jpg (207kb) downloaded 59 time(s). Placid Sourced.jpg (196kb) downloaded 52 time(s). Placid shunted.jpg (173kb) downloaded 50 time(s). transformer loaded.jpg (207kb) downloaded 42 time(s). transformer unloaded.jpg (216kb) downloaded 66 time(s).You cannot view/download attachments. Try to login or register.
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Which that PS running at 510ma with no load it is going to run very very hot. It will cool down a bit when the load is dissipating more of the energy.
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V3 Tridents are better than V1.1 in many ways.
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Yes I am aware that the placids running without load at these levels would make them extremely hot. However, atm it is only shunting ~75mA. The rest (of the 520mA sourced) is powering the B3 and optical module. Am I to understand that even though they are connected, and from what I can see "using" the sourced current, the placid will run far less hot when playing music? The drop in voltage is from ~5.2V to ~5.1V I have already fitted trident V1.1 (AVCC and tridents are underneath the pcb). The Placid HDBP was also connected tonight, and is now ready for the ivy stage. Will do a test of LCDPS/LCBPS vs Placid later on. Still waiting for parts for the arduino control and some connectors in order to do a proper AB test between the two. gwikse attached the following image(s): Ready for Ivy3.jpg (194kb) downloaded 49 time(s).You cannot view/download attachments. Try to login or register.
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The Placid heatsinks run hot. It's fine. Expect to see up to a 50-60C heatsink in operation. That's a typical idle temp for a Class-A amp, so it's not crazy (it is atypical in digital circuits).
50C is usually estimated as 2-3 seconds touch to the heatsink before you need to pull away (though we actually measure with a IR probe in testing :) ).
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I think it will be fine. It can be made to run a little less hot though. I will cut some holes in the bottom along the red lines. That way the heat will rise and "fresh" cold air will be drawn in through the holes. But enough about heat for now. I am a little curious to how the power supply`s handle high AC main voltages. I have measured the AC here and it is around 240VAC. The highest I have seen using a power-logger is 245VAC. The lowest I have measured was 235VAC. Most transformers I have used have given fairly high voltages compared to what they are supposed to be. My 15V transformers give about 17VAC and my 9V`s give around 10,5VAC. This would cause the power supply`s to run hotter correct? Are there any other disadvantages of high AC lines? Best Gunnar gwikse attached the following image(s): Vent holes.jpg (189kb) downloaded 38 time(s). vent holes 2.jpg (183kb) downloaded 30 time(s). side by side test 1.jpg (146kb) downloaded 42 time(s). front.jpg (155kb) downloaded 43 time(s). stacked.jpg (157kb) downloaded 53 time(s).You cannot view/download attachments. Try to login or register.
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My AC regularly sits at 252v, I always wondered if this was an issue.
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Well you definitely could go a bit lower on the secondary voltage or larger on the heatsinks, but you should still be ok.
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