Elektor- High-End-Preamp - PGA2311 - Page 2

Leon08 · 28th November 2010, 03:15 PM

No, I'm just another who has also build a preamp wich is based on this one.Here is my preamp:Home - DIY Corner

smithy666 · 29th November 2010, 07:35 AM

Here are some pics of my finished preamp;

Leon08 · 29th November 2010, 12:48 PM

Very nice, but your preamp is a bit different.Can you describe what you changed?

smithy666 · 29th November 2010, 11:25 PM

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.

Leon08 · 30th November 2010, 12:52 PM

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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28th November 2010, 03:15 PM	#11
Leon08 Banned Join Date: Sep 2010 Location: at Home	No, I'm just another who has also build a preamp wich is based on this one.Here is my preamp:Home - DIY Corner

29th November 2010, 12:48 PM	#13
Leon08 Banned Join Date: Sep 2010 Location: at Home	Very nice, but your preamp is a bit different.Can you describe what you changed?

29th November 2010, 11:25 PM	#14
smithy666 diyAudio Member Join Date: Mar 2001 Location: Sydney	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.

30th November 2010, 12:52 PM	#15
Leon08 Banned Join Date: Sep 2010 Location: at Home	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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