DSP Xover project (part 2)

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i_should_coco

i_should_coco

Member
Joined 2003
Per said:
Does anybody know if Opamp BB627BP will fit in najda directly?
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Yes, but as noted above, they need an adapter. TBH, I wouldn't bother for the difference.

On the other hand, I tried some Burson discretes and they made an very significant difference. Considering that in the UK, by the time you have addded adapters, etc. the OPA627 costs nearly as much as the Burson, I would go for the Burson.
 
S

Shutdown98

Member
Joined 2010
DieterK said:
I bought a Najda Board second hand in September from a user in the german hifi-forum. Now i had build it up. But there is one problem i have, the board do not start up. Supply Voltage is Ok. What to do to find the error?

Regards
Dieter
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Hello Dieter,
On the waf website are manuals with some problem shooting steps.
Have you connected a pc to your board and installed NUC?
Out of the box there are 3 pass through setups defined. maybe those are not defined any more because you have it second hand.
With NUC you can define the settings and channels.
 
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DieterK

DieterK

Member
Joined 2014
There are not so many trouble-shooting tips i need... I have, for first step, the minimal configuration with only one led and the 10kOhm resistor in place of Display an only the standby Key. I can measure all three supply voltages at their places on the Ports. But, when try to start the board with the "standby-key", nothing happens. When i try to get connection with NUC the software also says no board to find.

Is there any possibility to make a reset for the prozessor or so?
 
F

F2a11

Member
Joined 2013
Hi,
I am very satisfied with Sparkos Labs discrete Op Amps SS3602! The advantage is his size.
The datas are similar to Bursons.
I need the space because I changed the 22uF Elkos to Foil Condensers which are much bigger.
Both changings made the Najda really wunderfull!
Do not forget to eleminate the switching power supply against an analogue one!
regards
Ulf
 
S

Shutdown98

Member
Joined 2010
I am still waiting for the converters for the OPA627 opamps.
Did allready change to wima caps. That makes the sound allready quite a bit better.
Left 2 opamps original because perhaps i am going for the Bursons too, in that case i have to see how it can fit.
At this point i have changed to the NE5532 opamps which are very cheap but sound better than the LM833. Better top end and all in all nicer to listen to.

It is all still an electronic an a wooden plank project :) but it is evolving.
Did also replace the power source on tghe right to a terroid and this one: http://www.diyinhk.com/shop/audio-k...e-dac-power-supply-regulator-33v55v-1ax4.html for the Najda and the WaveIO
https://plus.google.com/u/0/1129376...6121950574627045746&oid=112937628903960323118
 
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DieterK

DieterK

Member
Joined 2014
First Test-Run is done. I think that it was a good idea to take the Najda-Board :)
All is good but if the CD Player runs the ADC shows overload. What to do? Must i make the attenuation before Signal goes into Najda?
 

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DieterK

DieterK

Member
Joined 2014
The switching Power Supply needs less Power in standby. And i don't belive that it is better for digital line to take a linear Power Supply. A switcht Power-Module gives a good enough quality for digital. But i must say it's my first time with a switching Module. In the past I only used linear Power, but my past in diy was analog only :)
 
DieterK

DieterK

Member
Joined 2014
Today i took an potentiometer to level down my cd-player cause the overload from de ADC. When I try to level during the Najda-board was in action i became a terrible oscillation on the signal. By leveling during standby there was no Problem. Now it works, but it will be fine to know what happened? Is there a filter in front of the ADC that can swing?

Regards
Dieter
 
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