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Old 31st October 2004, 05:24 PM   #1
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Talking Dax-bosoz

Hi,

I finally finished my DAX-BOSOZ this week. It is a combination of Perpetual Technologies P1-A, P3-A with a X-BOSOZ output stage.
In the pic you can see the P1-A and P3-A on the right, the x-bosoz in the middle and the power supply for the P1/3-A on the left.
The power supply for the x-bosoz sits underneath the aluminium cover in the middle.

William
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Old 31st October 2004, 05:27 PM   #2
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heres the x-bosoz with current source. Ive used Harris IRF610 for all positions bias at 40mA per fet.
Supply voltages are +40 and -22V unregulated.
The input filter is on a small board plugged into the main board and can be changed quite fast.
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Old 31st October 2004, 05:31 PM   #3
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the power supply for the x-bosoz is placed underneath an aluminium sheet and consist of a 60VA transformer (36V and 24V secondaries) some fast diodes. The caps are seperate for left and right channel with a CRCRC filter
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Old 31st October 2004, 05:58 PM   #4
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these are the P3-A (top) and P1-A (underneath a sheet of copper). They are attached to the back (the P1-A is isolated) and to a piece of plexiglas.
I put 4 new pushbuttons on the front for the various modes and used some fibreoptics to get the light from the leds to the faceplate.
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Old 31st October 2004, 06:01 PM   #5
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this is a picture of the back. On the left are the P1/3-As, in the middle the balanced out from the x-bosoz and on the right the mains entrance and three power switches.
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Old 31st October 2004, 06:08 PM   #6
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here a last pic of the front. On the right are the 4 pushbuttons and a row of 1mm holes for the fibre optics.
The front is 10mm aluminium, the sides and internals are 6mm and the bottom and top are 4mm aluminium.

With this one I now finally removed all opamps out of the signal path
It sounds quite a lot better than the (modified) P1-A /P3-A combination. Changes are the same as when I changed from my OPA627 based preamp to a x-bosoz. It sound more natural throughout the range, somehow much faster, better (less thumpy) and deeper bass. Room information is also improved. This way listening to CDs is slowly becoming acceptable

William
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Old 31st October 2004, 06:21 PM   #7
uli is offline uli  Austria
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Thumbs up fine...

...arts, wuffwaff!

Uli

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Old 31st October 2004, 06:26 PM   #8
Cobra2 is offline Cobra2  Norway
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Thumbs up NICE!

Good work...!

Arne K
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Old 31st October 2004, 06:38 PM   #9
moe29 is offline moe29  United States
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WOW!

nice work, would love to hear it.
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Old 31st October 2004, 06:47 PM   #10
Netlist is offline Netlist  Belgium
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I like the (probably overkill) net filter and the nice metalwork.

Great job William.

/Hugo
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