The true experimental tweak thread

[Bricki]

34 minutes ago, austinpop said:

 

Yup the Supras are great! I know one or two people who have bought spools of the stuff for long runs in their house.

I may need to get a 10 meter run myself ?

[bit01]

On 3/20/2018 at 2:27 PM, bit01 said:

 

After several tens of hours powering the ultraRendu I find the power supplies converge (break-in?) to very similar performance and 'sound'. I am hard pressed to select between the PH SR4, LPS 1.2 and the HDPULN + r-core. They are all excellent.

 

On 3/15/2018 at 5:39 AM, Cornan said:

 

That´s great @bit01!  I did´nt catch which of these power supplies you preferred with the ultraRendu though?

 

I am using HDPULN (Stammheim 3A LT3045) in series fed by a Gophert csp-3205II powering Brooklyn DAC and it sounds stunning.

 

I moved the uRendu/DAC setup to my main system where I can hear differences between the power supplies more easily. My initial impressions are that the HDPULN has the 'sweet' full bodied sound, the LPS-1.2 the best resolution, the SR4 showing a solid focused image with less 'air'. The SR4 (@9V powering the LPS-1.2 @7V (against Paul's wishes) does combine their strengths and gives a listening experience with good resolution and reduced 'digital stress' when compared to the smps/LPS-1.2 pairing. Further listening will ensue.

[Cornan]

49 minutes ago, bit01 said:

 

 

I moved the uRendu/DAC setup to my main system where I can hear differences between the power supplies more easily. My initial impressions are that the HDPULN has the 'sweet' full bodied sound, the LPS-1.2 the best resolution, the SR4 showing a solid focused image with less 'air'. The SR4 (@9V powering the LPS-1.2 @7V (against Paul's wishes) does combine their strengths and gives a listening experience with good resolution and reduced 'digital stress' when compared to the smps/LPS-1.2 pairing. Further listening will ensue.

 

Awesome bit01! Thanks a lot for sharing your impressions between those great PSUs! ?

My personal best is the Gophert csp-3205II>HPULN>HPULN with LPS-1.2 so it is definately sensitive to AC mains. Still I very much prefer the Gophert csp-3205II>HC-HPULN>HC-HPULN to Gophert csp-3205II>HPULN>HPULN>LPS-1.2, but I’ll guess that is very much due to the Kemet aluminium caps. I will try the Kemets at the output of the LPS-1.2 and actually think it could be a possible game changer for the LPS-1.2 giving it that sweet music glow that the HC-HPULNs got. Adding these caps to my HPULNs will be the next step as well for sure! ?

[Cornan]

I have just been home to Sweden for a couple of hours. I could’nt let go of my thought to add a Kemet to the output of my LPS-1.2. Just had to do it quickly. So I did! ?

 

 

I have listen to Bahamas - Earthtones since I came home (MQA). The same album was played after the Kemet was introduced.

 

So, what is the results of the Swedish jury? 

 

The Kemet simply rocks the LPS-1.2!!!! ?

Sweeeeet and natural sound and deeeper low end is very obvious upgrades, but ut us like the whole frequency range is clear as spring water. Transparent like anything. 

The Kemet succeded in the spot where LT3045 did’nt. Ofcourse this raise the question what a LT3045 loaded with a Kemet could di at that spot? You’ve probably already guessed my next experiment! ? 

 

 

[Cornan]

Time for the next Kemet experiment and the last one for the day. This one in the output of the series LT3045 powering ISO Regen plus BW USB input.

 

 

Wow! Maybe the best improvement so far! I didn’t even bother with the same impressions all over again. I think you’ve got it already! ? Clearly these Kemet is amazing. I am sure I will hit a wall anytime soon, but so far it looking amazing! When I hit the wall I intend to adjust that possible brightness using Elna Silsmic II 1000uF caps at the input on selected LT3045s, but I have’nt hit that wall yet and I have a lot more Kemets to try. Rock’n’roll! ??

[mozes]

4 hours ago, Cornan said:

I have just been home to Sweden for a couple of hours. I could’nt let go of my thought to add a Kemet to the output of my LPS-1.2. Just had to do it quickly. So I did! ?

 

 

I have listen to Bahamas - Earthtones since I came home (MQA). The same album was played after the Kemet was introduced.

 

So, what is the results of the Swedish jury? 

 

The Kemet simply rocks the LPS-1.2!!!! ?

Sweeeeet and natural sound and deeeper low end is very obvious upgrades, but ut us like the whole frequency range is clear as spring water. Transparent like anything. 

The Kemet succeded in the spot where LT3045 did’nt. Ofcourse this raise the question what a LT3045 loaded with a Kemet could di at that spot? You’ve probably already guessed my next experiment! ? 

 

 

Keep in mind that caps take a few days to sound their best.

[Cornan]

5 hours ago, mozes said:

Keep in mind that caps take a few days to sound their best.

 

Yes I know, but the Kemet’s sounds really great directly out of the box (or bag in this case)! ?

[sandyk]

14 hours ago, Cornan said:

I have just been home to Sweden for a couple of hours.

 

Is that why the Asian Spam appears to have stopped ?

[Cornan]

3 hours ago, sandyk said:

 

Is that why the Asian Spam appears to have stopped ?

 

Yes, but promise not to tell anyone! ?

[Cornan]

BTW. I added another Kemet to the output of the HPULNs in series feeding the LPS-1.2. 

 

 

A fairly subtile improvement, but still I would say it added a tad more resolution and worth keeping.

[Cornan]

Look what arrived today! ?

 

 

The 230-15VAC balanced and floating PS looks amazing! Really heavy and great build. Came quickly from Singapore and very well packed. My all linear & balanced HC-HPULN (in series) is coming very close to its ”official release”! ?

 

This came today as well.

 

 

Upgraded tools and 10 pcs Panasonic FC type A aluminium polymer caps (25v/560uF) which I will compare to the Kemet A750 series that I have been thrilled about lately. These caps are more durable than Kemet (5000 hrs) and have great specs as well. Better than Kemet? Stay tuned to see how they compare! ?

 

 

[mfin]

Tidy. The case is the same as the HDPlex 200w by the looks of it, they are very solid feeling.

 

Was it an eBay job?

 

 

[Cornan]

5 minutes ago, mfin said:

Tidy. The case is the same as the HDPlex 200w by the looks of it, they are very solid feeling.

 

Was it an eBay job?

 

 

 

Yes, I bought it from this eBay seller.

 

HIFI Audio 50W AC 12V Balanced isolation power supply 50VA EMI AC version PSU https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F132363016347

 

I am extremely pleased with it so far. Looking great for the price! ?

 

Please note that it is a AC-AC PS. No DC!

 

[mfin]

14 minutes ago, Cornan said:

 

Yes, I bought it from this eBay seller.

 

HIFI Audio 50W AC 12V Balanced isolation power supply 50VA EMI AC version PSU https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F132363016347

 

I am extremely pleased with it so far. Looking great for the price! ?

 

Please note that it is a AC-AC PS. No DC!

 

 

Cool, it's 15V ac yeah? When you use two HC-HPULN's in series do they drop 1V each or is the drop configurable? (otherwise I'd assume you'd end up at 13v not 12v).

[Cornan]

21 minutes ago, mfin said:

 

Cool, it's 15V ac yeah? When you use two HC-HPULN's in series do they drop 1V each or is the drop configurable? (otherwise I'd assume you'd end up at 13v not 12v).

 

Yes, I choosed 15VAC output on mine. I actually intend to try with just one HC-HPULN with 12VDC output for starters since this will in theory, presented by DiyAudio member Get-lid here http://www.diyaudio.com/forums/vendor-s-bazaar/310402-fs-ultra-low-noise-power-supply-lt3045-based-pcb-13.html#post5420602

provide an optimal ripple rejection, so I am eager to try that out. I will also try with series HC-HPULN with different voltage drop-down. If possible with 15VAC I will surely try 3v drop down with two boards as well. Not completely sure that would work though? ?

15VAC-15VDC-12VDC should be possible though.

[[email protected]]

8 minutes ago, Cornan said:

 

Yes, I choosed 15VAC output on mine. I actually intend to try with just one HC-HPULN with 12VDC output for starters since this will in theory, presented by DiyAudio member Get-lid here http://www.diyaudio.com/forums/vendor-s-bazaar/310402-fs-ultra-low-noise-power-supply-lt3045-based-pcb-13.html#post5420602

provide an optimal ripple rejection, so I am eager to try that out. I will also try with series HC-HPULN with different voltage drop-down. If possible with 15VAC I will surely try 3v drop down with two boards as well. Not completely sure that would work though? ?

15VAC-15VDC-12VDC should be possible though.

Hi Cornan

1st 

with 15vac you will get 20+VDC after rectifier!!! And if you want to have 12VDC out  @3A - need to dissipate 24W!!!

2nd

i am not agree with PSRR calculation for the 2 reg in series

[Cornan]

2 minutes ago, [email protected] said:

Hi Cornan

1st 

with 15vac you will get 20+VDC after rectifier!!! And if you want to have 12VDC out  @3A - need to dissipate 24W!!!

2nd

i am not agree with PSRR calculation for the 2 reg in series

 

Thanks for your input Alexey! ?

Looks like two 5A (not 3A) HC-HPULNs in series will be the way to go then.

 

How would you calculate PSRR with two regs in series if you do not mind me asking?

[[email protected]]

7 minutes ago, Cornan said:

 

Thanks for your input Alexey! ?

Looks like two 5A (not 3A) HC-HPULNs in series will be the way to go then.

 

How would you calculate PSRR with two regs in series if you do not mind me asking?

in theory 70db+70db=140db :) (for serial connection)

In real life - less 

 

[Cornan]

1 minute ago, [email protected] said:

in theory 70db+70db=140db (for serial connection)

In real life - less 

 

 

So Get-lid is really calculating parallel connection with 70+70= 70 (+3dB)? Your calculating makes more sense to me as well since it is similar to how you would calculate mA and V on batteries.

[mfin]

1 hour ago, Cornan said:

 

Yes, I choosed 15VAC output on mine. I actually intend to try with just one HC-HPULN with 12VDC output for starters since this will in theory, presented by DiyAudio member Get-lid here http://www.diyaudio.com/forums/vendor-s-bazaar/310402-fs-ultra-low-noise-power-supply-lt3045-based-pcb-13.html#post5420602

provide an optimal ripple rejection, so I am eager to try that out. I will also try with series HC-HPULN with different voltage drop-down. If possible with 15VAC I will surely try 3v drop down with two boards as well. Not completely sure that would work though? ?

15VAC-15VDC-12VDC should be possible though.

 

What I am missing is whether on the HC-HPLUN you can adjust the voltage drop down? I assume you can, and that there's an adjustment pot to do so whilst reading the output voltage with a multimeter?

 

Just trying to fill a gap in my knowledge as I want to buy and try some.

[Cornan]

9 minutes ago, mfin said:

 

What I am missing is whether on the HC-HPLUN you can adjust the voltage drop down? I assume you can, and that there's an adjustment pot to do so whilst reading the output voltage with a multimeter?

 

Just trying to fill a gap in my knowledge as I want to buy and try some.

 

Yes there is a blue voltage reg pot for output DC voltage adjustments on both HPULN (3A) and HC-HPULN (5A)! ?

I use a simple two wire DC voltage LED meter to test the output voltage of each board while adjusting with the pot.

 

 

You can see the pot on this picture. The blue cube with a copper screw on top.

[mfin]

Great, thanks, got it now

[lmitche]

5 hours ago, [email protected] said:

Hi Cornan

1st 

with 15vac you will get 20+VDC after rectifier!!! And if you want to have 12VDC out  @3A - need to dissipate 24W!!!

2nd

i am not agree with PSRR calculation for the 2 reg in series

Cornan, Alexey is right to point out you may smoke your boards with a 15 volt ac transformer. The voltage of the rectifiers are likely to be over the maximum input thresholds of the lt3045s.

[Kritpoon]

6 hours ago, [email protected] said:

Hi Cornan

1st 

with 15vac you will get 20+VDC after rectifier!!! And if you want to have 12VDC out  @3A - need to dissipate 24W!!!

2nd

i am not agree with PSRR calculation for the 2 reg in series

 

Could you please kindly explain how after the rectifier the VDC is more than input VAC? Is there a formular for calculating VDC output after full bridged rectification from VAC input? Thank you.

[lmitche]

http://www.bristolwatch.com/ele/basic_ac_rectification.htm