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Old 10th April 2005, 08:41 AM   #131
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Quote:
Originally posted by Peter Daniel
But when it comes to material containing female vocals, I detect some softening and lack of precision in highs,
I don't know why and if it may work or how , but in this regard I would
try for a pair of ZVP3306A instead of the IRF9610 in the differential pair .


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Old 11th April 2005, 11:57 AM   #132
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I received the PCBs five minutes ago. They look and feel great.
Thanks for your excellent work Peter!
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Old 11th April 2005, 01:22 PM   #133
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I noticed that the post is working really fast recently. The small package I sent to Australia on Friday, was alredy delivered yesterday.

I will be posting some additional info today, with regards to board stuffing.
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Old 11th April 2005, 02:36 PM   #134
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All the parts numbers on the board correspond to parts numbers used in the A30 schematic, that can be found in this manual: http://www.passlabs.com/downloads/ol...t/a30manr0.pdf

If you wish to install protection diodes, they mount underneath, and should be installed first. Also, install 2 jumpers. Use either zero ohm jumpers (available from DK) or insulated wire in order to provide some clearance from the power traces (although the mask is there, it never hurts to be cautious).
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Old 11th April 2005, 02:41 PM   #135
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The grounds on board are separated and this allows individual connection to main power point. Some reported improvement, so I decided to make this possible. GND stands for constant current circuit ground and SG marks input ground. In case you don't want to run them separately, install jumper in place marked OPT (optional) and connect both grounds. In this case main ground connection is taken from GND point and signal ground (from from the input) connects to SG point.
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Old 11th April 2005, 02:42 PM   #136
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For those who will use only single ended input connection, I provided a jumper space, that connects IN - with signal ground.
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Old 11th April 2005, 02:47 PM   #137
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I configured my test board following recommendations from 2 previous posts (OPT jumper in place) and it was working fine.

There is also an option to configure grounds exactly like in A30 schematic, and here you mount R0 resistor (3ohm) and install R6 with a wider footprint (see the pic, and additional hole for that resistor). There is only one ground connection point on the board now (GND), you don't connect anything to SG, R6 connects directly to GND, all input shunting resistors from positive input connect to GND through R0.

There are 4 mounting holes in case you want to move output devices further away from the board. Use plastic standoffs to make sure you don't short any traces.
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Old 11th April 2005, 08:30 PM   #138
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Got my boards today also.
They look great!

/Niclas
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Old 12th April 2005, 02:05 PM   #139
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Got my boards yesterday. Thanks

cheers,
Thijs
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Old 12th April 2005, 04:58 PM   #140
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G M B today , thanks
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