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Old 28th November 2010, 03:15 PM   #11
Leon08 is offline Leon08  Germany
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No, I'm just another who has also build a preamp wich is based on this one.Here is my preamp:Home - DIY Corner
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Old 29th November 2010, 07:35 AM   #12
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Here are some pics of my finished preamp;
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File Type: jpg Pre-fronton.jpg (87.1 KB, 838 views)
File Type: jpg Pre-back.jpg (96.5 KB, 766 views)
File Type: jpg Pre-inside.jpg (92.8 KB, 775 views)
File Type: jpg Pre-inside2.jpg (86.5 KB, 747 views)
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Old 29th November 2010, 12:48 PM   #13
Leon08 is offline Leon08  Germany
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Very nice, but your preamp is a bit different.Can you describe what you changed?
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Old 29th November 2010, 11:25 PM   #14
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The only differences are I've used 3 power supply boards instead of 2 - 1 powers the relay boards (through a 5v regulator attached to the output of the board), 2 relay boards in parallel so I can switch the signal and ground lines of 8 inputs, a power on board (my design) which enables me to use a momentary switch on the front panel as the power switch, and the display is an Optrex 20x2 blue character (haven't changed the code). I also put 100 ohm resistors on the output and small RC on the input to the main board as per Elektor's final comments. I fitted a metal screen between the power supply boards and the pre-amp boards for extra shielding (again as Elektor suggested).

So the preamp is the same design as the original, just with a couple of minor tweaks of supporting boards.

Sound wise I found it very impressive, although I only listened for a couple of hours as I built it for my mother-in-law. She has been listening non-stop for the past couple of days and loves it. I've posted some pics in the Solid State pics post of this and an Aussie Amplifier nxV200 amp I built as its matching mate.
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Old 30th November 2010, 12:52 PM   #15
Leon08 is offline Leon08  Germany
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I understand, your preamp has 8 balanced inputs now.Also your power on board is very nice.I wanted to do something like this too, but had no time for this.Can you give more info about this, maybe the schematic?
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Old 26th August 2014, 11:51 AM   #16
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Full part list avaiable?
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