[justbenice]

  ....

 
 So did you manage to use the V5D ? Please let me know if it safe to use now. My XLR pin 1-2, 1-3, 2-3 now are arround 1mV only. 

 

[Tomus4]

   
 So did you manage to use the V5D ? Please let me know if it safe to use now. My XLR pin 1-2, 1-3, 2-3 now are arround 1mV only. 

It looks - yes. Please check this voltage when music playing and, how b0bb suggest, check power supply voltage between opa pin 4 and ground and 8 and ground. Shoud be less then 15V.

 

[justbenice]

  It looks - yes. Please check this voltage when music playing and, how b0bb suggest, check power supply voltage between opa pin 4 and ground and 8 and ground. Shoud be less then 15V.

Thank you. I check those volt when music player it all around 1mV . But i tried all the way and could not trim the volt between pin 2-3  in left channel to 1mV, it is now 2.5mV . is it ok ?
I also check the pin 4- GRD and 8-GRD, it all around 14.9V . 
 
BTW, did you put your V5D to the DAC now ? How long it have been use ? 

 

[Tomus4]

  Thank you. I check those volt when music player it all around 1mV . But i tried all the way and could not trim the volt between pin 2-3  in left channel to 1mV, it is now 2.5mV . is it ok ?
I also check the pin 4- GRD and 8-GRD, it all around 14.9V . 
 
BTW, did you put your V5D to the DAC now ? How long it have been use ? 

left channel to 1mV, it is now 2.5mV . is it ok ? - it is because components (I/V resistors and caps) tolerance  - I had the same before components repacement - see previous posts
 
Check please voltage on the RCA output. Before repacement I had 1,5mV in left channel- now I have 0,1mV.
 
Power supply is optimal for V5
 
Yes I put V5D today.

 

[justbenice]

  left channel to 1mV, it is now 2.5mV . is it ok ? - it is because components (I/V resistors and caps) tolerance  - I had the same before components repacement - see previous posts
 
Check please voltage on the RCA output. Before repacement I had 1,5mV in left channel- now I have 0,1mV.
 
Power supply is optimal for V5
 
Yes I put V5D today.

 My left RCA is 0.4mV , right RCA is 1.5mV. So is it safe to put the V5D in ? I already burned the V5D  one time so i don't want to burn it again  It may not get warranty this time !

 

[Tomus4]

   My left RCA is 0.4mV , right RCA is 1.5mV. So is it safe to put the V5D in ? I already burned the V5D  one time so i don't want to burn it again  It may not get warranty this time !

Ask Burson
I have 0,1 mV with default opa and 1,5mV with V5D. I ask Burson it is correct.

 

[justbenice]

  Ask Burson
I have 0,1 mV with default opa and 1,5mV with V5D. I ask Burson it is correct.

I am using the V5i, okay, i will email bruson

 

[Tomus4]

 
TX2575 take 7-10 days to settle in and the sound will smooth out by a small degree, it is not sensitive to temperature, one of the main reasons I chose it to avoid temp drift effects from the resistor self heating. The 9018 runs a fairly large current, so  effects of resistive heating needs some attention.
 
Pulsar is expensive at 400 Euros and is not available for sale in every country, contact Pulsar to verify.

TX2575 take 7-10 days to settle in - 7-10 days 24h a day playing?
 
Pulsar is expensive but worth the price, isn't it?

 

[b0bb]

  TX2575 take 7-10 days to settle in - 7-10 days 24h a day playing?
 
Pulsar is expensive but worth the price, isn't it?

I just leave it powered on 24x7 10days in a row
 
The Pulsar is worth it to me, you might want to try a less costly alternative first before getting the Pulsar.

 

[Tomus4]

Hi b0bb,
 
The Pulsar has sent to me today. But I have a problem power supply for clock. I measued it today and I have 4,88V, so 1763 doesn't work. I don't know when it happend. Maybe Sanyo Oscon is damaged - I have to check it.
 
I measured caps today:
Sanyo OSCON  ESR- 0,09 VLOSS-2% over 54uF - new one - I have bought 2 extra.
Nichicon              ESR- 0,34 VLOSS-1,1% over 47uF - desoldered from DAC
Is it OK?
 
Fortunately I orderd  http://www.ldovr.com/product-p/lt3045-s.htm together with http://www.ldovr.com/product-p/tps7a4700-lm31x.htm just to check it as power supply for oscilator. 
Now it will replaced 1763. I would like to solder LT3045-S to caps leg  on the other side of the board.  Do you thing it is good idea?

 

[Tomus4]

   
 
 
5)The Tekdevice board needs a 10uF tantalum capacitor soldered between  the IN pin on the regulator and ground, a suitable point is the bypass cap location, the one with the soldered jumper.
I mounted the the 10uF cap on the other side of the board.
 
NOTE: +ve electrode to the IN terminal and -ve to ground, do not connect the tantalum cap in reverse
 
Here is a suitable cap
http://www.mouser.com/ProductDetail/AVX/TAP106K020SCS/?qs=sGAEpiMZZMtZ1n0r9vR22d%252b8XmbM9QM8iVuE3tFomWE%3d
 
 

I have http://pl.mouser.com/ProductDetail/KEMET/T350J156K035AT/?qs=sGAEpiMZZMtZ1n0r9vR22ZBQR9LXYg3mOZWE6B8GMKo%3d
Will it be suitable ?
 
As I understand mod around regulator http://www.ldovr.com/product-p/tps7a4700-lm31x.htm will be the same like Tekdevice

 

[b0bb]

  Hi b0bb,
 
The Pulsar has sent to me today. But I have a problem power supply for clock. I measued it today and I have 4,88V, so 1763 doesn't work. I don't know when it happend. Maybe Sanyo Oscon is damaged - I have to check it.

You may have damaged a trace on the board while extracting the original caps, the OSCONS do not appear to be causing a problem.
Check the ground and connections to R1 and R2 are intact.

 
 

I would like to solder LT3045-S to caps leg  on the other side of the board.  Do you thing it is good idea?

If the LT1763 regulator is broken, replace it with a new LT1763.
 
The external regulator board is going to end up acting as a FM radio antenna. 100MHz is in the FM radio band.
A FM radio signal is 100MHz±20kHz with the latter being the audio signal.
 
In the XO world this frequency variation is called phase noise.
Here is what happens to the Pulsar jitter performance when a 20uV FM radio signal with modulated 10Hz-10kHz audio white noise source is added in 100MHz±10kHz band
 

	Phase noise  (dB)	Phase noise + 20uV FM modulated white noise (dB)
10Hz	-105	-93.08
100Hz	-130	-95.42
1kHz	-140	-95.51
10kHz	-148	-95.54
Jitter (fs)	35.115 fs	3769.48 fs

 
This is one way to completely ruin the Pulsar's performance.
 
I think this is a foolish waste of a 400€ OCXO.

 

[b0bb]

  I have http://pl.mouser.com/ProductDetail/KEMET/T350J156K035AT/?qs=sGAEpiMZZMtZ1n0r9vR22ZBQR9LXYg3mOZWE6B8GMKo%3d
Will it be suitable ?
 

Looks OK.

 

[Tomus4]

  You may have damaged a trace on the board while extracting the original caps, the OSCONS do not appear to be causing a problem.
Check the ground and connections to R1 and R2 are intact.

 
.

Regulator problem solved. There was no connection (cold solder) beetween R2 and board - Vout side. It looks like factory fault. 
Thank you.
 
I have question about Sony OSCON caps. Now I and you have 47uF and his legs are little bit under board - is it any problem for FM antenna effect?

What about using bigger one e.x 150uF - legs should hide in the board.
 
 
I will back with external regulator. I have an idea how to connect it to board to avoid antenna effect.

 

[b0bb]

A couple extra pictures of my 004.
 
Front

 
The powersupply for the enhanced USB is new and quite different, more on that later.
This one has the Jensen caps.
 
The primary regulator for the DAC and XO is the LT1963

 
Back of board:

Board is very clean, LKS did a great job of the post-assembly cleanup
 
Closeup of I/V resistor

 
Looks like a high quality 0.5% tolerance resistor, this looks at least 0.75-1W to handle the large current.
003 I/V resistor (249ohm) is 3.6x higher.