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Old 27th April 2012, 06:10 PM   #1071
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Default Vref cap tweak

Vref cap tweak
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Old 27th April 2012, 06:55 PM   #1072
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Quote:
Originally Posted by Murdoc View Post

My questions is, what is the best practice on wiring the SSLV with a (pre)amplifier, in my case the BA-3.
a) As the SSLV uses remote sensing, the (twisted) cables should meet as close to the terminal of the BA-3 board as possible.
b) If it was an unregulated supply, I would set here a star ground, and wire it to the earth connector (seperated with a bridge rectifier || 10R || 100nf). Can I do the same with SSLV--BA3?
Is this the best way to get "perfect" ground, would this be a best practice?

Thank you for your help!

Best regards,
Matthias
Hi Matthias,
Just seen your post. I have the SSLV powering the BA-2 and the BA-3 and in both cases I have followed Nelson's power supply circuit to the letter. The main C-R-C power supply ground is taken as the star ground and this supplies the power boards. This star ground is connected to the chassis and the mains earth via the CL60 that Nelson has in his circuit diagram.
I have then connected the ground of the SSLV to this same star ground point (as well as the ground of the front end of course).
If you don't connect the SSLV ground to the star ground you will get a hum as I did when experimenting with the BA-2 (I didn't bother with the BA-3).

Hope this helps. If you are using the BA-2 front end with the SSLV then remove the noise filters consisting of the 1000uF cap (remove) and the attached resistor (short the latter don't remove it).
Best wishes,
Chris
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Old 28th April 2012, 03:07 AM   #1073
Salas is offline Salas  Greece
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Quote:
Originally Posted by merlin el mago View Post
Vref cap tweak
Isn't there a story?
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Old 28th April 2012, 08:12 AM   #1074
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Yes the story is that I forgot that I have on hand these superb Auricap 10uF 200V without use so I installed and WOW is incredible always these caps sounds very good adding more bass, mids & clear trebles, the sound is full and more 3D, the bass is more marked but not boomy, the voices have more body so more natural & the highs are simply superb very clear but not crystal or metallic, Auricaps are specials I have the same subjective results using them in the signal way like in PSU or in the regs.

The reg. is powering a TP Legato without output caps.
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Old 28th April 2012, 08:39 AM   #1075
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@merlin el mago

You're making me regret the decision to NOT include the Auricaps in my last pcx order. They were good value at 40% off but I still passed up on the opportunity. My sslv will be supplying a DSP stage though so decided in my application they wouldn't be as suitable perhaps.
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Old 28th April 2012, 08:50 AM   #1076
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Quote:
Originally Posted by merlin el mago View Post
Yes the story is that I forgot that I have on hand these superb Auricap 10uF 200V without use so I installed and WOW is incredible always these caps sounds very good adding more bass, mids & clear trebles, the sound is full and more 3D, the bass is more marked but not boomy, the voices have more body so more natural & the highs are simply superb very clear but not crystal or metallic, Auricaps are specials I have the same subjective results using them in the signal way like in PSU or in the regs.

The reg. is powering a TP Legato without output caps.
What kind of caps did you have before?
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Old 28th April 2012, 01:31 PM   #1077
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Default Shunt resistor voltage

Hi,
I have my shunt regulator running with 3 leds for the CCS. As I lower the CCS resistor value to increase the current, I notice that the voltage across the CCS resistor drops to a lower value as expected. I currently have 1.1 volts across the CCS resistor and want to increase the current. Is there a problem if the voltage across the CCS resistor drops to a lower value? I know that I can add another led to increase the voltage but I would rather not because it will increase the CCS resistors dissipation. Any advice on how to proceed is greatly appreciated.
Also, I am not sure on which wires to twist together. Is it the 2 force and the 2 shunt, or the positive force/shunt and negative force/shunt?
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Old 28th April 2012, 01:48 PM   #1078
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Quote:
Originally Posted by hochopeper View Post
@merlin el mago

You're making me regret the decision to NOT include the Auricaps in my last pcx order. They were good value at 40% off but I still passed up on the opportunity. My sslv will be supplying a DSP stage though so decided in my application they wouldn't be as suitable perhaps.
For digital as Vref I use lytic as per Salas advice in the manual BiB.

Quote:
Originally Posted by manamanam View Post
What kind of caps did you have before?
Arcotronics MKP 10uF 63V
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Old 28th April 2012, 01:50 PM   #1079
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Originally Posted by Billc View Post
Hi,
Also, I am not sure on which wires to twist together. Is it the 2 force and the 2 shunt, or the positive force/shunt and negative force/shunt?
Positive & negative force twisted
Positive & negative sense twisted
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Old 28th April 2012, 02:25 PM   #1080
Salas is offline Salas  Greece
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Quote:
Originally Posted by Billc View Post
Hi,
I have my shunt regulator running with 3 leds for the CCS. As I lower the CCS resistor value to increase the current, I notice that the voltage across the CCS resistor drops to a lower value as expected. I currently have 1.1 volts across the CCS resistor and want to increase the current. Is there a problem if the voltage across the CCS resistor drops to a lower value? I know that I can add another led to increase the voltage but I would rather not because it will increase the CCS resistors dissipation. Any advice on how to proceed is greatly appreciated.
Also, I am not sure on which wires to twist together. Is it the 2 force and the 2 shunt, or the positive force/shunt and negative force/shunt?
No problem, that is what's expected as with more current the Mosfet's VGS climbs nearer to the LEDS. You can proceed with small value 2W set resistors that will keep dissipation low, until Ohm's law shows you got your target. Up to 0.5A its feasible, higher is 4 LEDS territory. If you got some livelier Vf greens they can help for a bit more margin also.
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