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Shanti Dual LPS 5V/3A , 5V/1.5A
Shanti Dual LPS 5V/3A , 5V/1.5A
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Old 13th July 2019, 07:42 PM   #211
cdsgames is offline cdsgames  Canada
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Join Date: Jun 2015
Hi Soundcheck


this is calculated for DC...




Its a straight up calculation .


Compare this with shunt regulator (100mOhm min to 500mOhm max ...its very good.



Impedance at AC will be impacted by supercaps and caps (should be even lower)


However the supercaps and cap bank impacts mostly the transient delta ...


Your battery might be better at DC and worst at AC..


Its a balance





My friends , Shanti is sounding superb . I know I am biased , but you might now I am not a BS. The combination of low impedance , ultra low noise..its a breakthrough .




Cannot wait for the first reviews to be out ....




ps. Impedance at DC is dictated simply by R in the wire . (not by impedance of the supercaps)
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Old 14th July 2019, 06:48 AM   #212
soundcheck is offline soundcheck  Germany
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Location: DUS
Quote:
Originally Posted by cdsgames View Post
Hi Soundcheck
Compare this with shunt regulator (100mOhm min to 500mOhm max ...its very good.
That's the wrong comparison.

What many of the people around here do, and you know that, is attaching cap buffers to the power rails.
Why is that? Because not any regulator would do the job. Because if you e.g. attach 10 Oscon Sepcs to a power rails the ESR will drop into the single
digit mR area. Since these caps will sit right beside the sink there won't be much of cable/connector/EMI/RFI effects.
And all that will heavily improve slew-rate and transient response and recovery.



Quote:
Originally Posted by cdsgames View Post
Your battery might be better at DC and worst at AC..
It's not my battery. And it's DC and transients. Many of us are/have been using LiFePO4 batteries for years. IanCanada built not long ago and is offering and excellent LiFePO4 battery based power supply.

Common knowledge is that batteries are a bit noisier. That led to supercap buffers or supplies in the past.

However.

Since non of you guys supply proper datasheets, comparisons are pretty much impossible to accomplish.


Quote:
Originally Posted by cdsgames View Post
My friends , Shanti is sounding superb . I know I am biased , but you might now I am not a BS. The combination of low impedance , ultra low noise..its a breakthrough .

Nobody questions, that Shanti has the potential to play in the upper league on power supplies (saying that without having a proper datasheet at hand ).

But "Breakthrough"?? Nope. I don't see that. Pretty much all features are
existing since years. You simply increased the quality.

Certain features - such as the cables and connectors - I do not consider
great at all. That'd be the first thing I'd remove.

And I hold my breath regarding mains cable (-socket) impact. The first thought after seeing that was "I probably need to bypass that socket"


However. I do think you'll get your good reviews. In the land of the blind the one-eyed is king.

For sure the price-performance ratio of Shanti seems excellent.

Any. Yep. I know you guys deliver real nice and fair priced products.

Quote:
Originally Posted by cdsgames View Post
...but you might now I am not a BS...
Hmmmh.


Cheers
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Old 14th July 2019, 07:08 AM   #213
soundcheck is offline soundcheck  Germany
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Join Date: Mar 2005
Location: DUS
BTW. I stepped over below when looking at high quality lab supplies.

What I'd consider a nice and new feature in the audio power supply arena would be "slew-rate adjustment".

The idea behind it is that not all sinks can cope properly with low ESR supplies.
Extremely high slew rates are not always a good idea. There's a risk you run into oscillation. Certain devices even clearly state impedance requirements on power supplies. ( That's why these kind of parameters should show up in a datasheet of a power supply).

Still, such a feature I wouldn't consider a breakthrough. Because high quality lab supplies are offering such a feature.

Enjoy.
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Old 14th July 2019, 09:54 AM   #214
cdsgames is offline cdsgames  Canada
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Hi Soundcheck



The power source has an impedance... on Shanti thats 150mOhm


Now . we do have a low ESR supercap (and capacitors banks) that we did not take in calculation . So from 0.1A ramping to 2A we have voltage drop (after several seconds) we then measured the power supply impedance ( voltage unloaded .voltage drop and R load gives you the impedance of the PSU)



Our super caps and capacitor banks will lower the PSU impedance on transients .

Last edited by cdsgames; 14th July 2019 at 10:14 AM.
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Old 15th July 2019, 09:04 AM   #215
soundcheck is offline soundcheck  Germany
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Great to see that you start thinking about the subjects I'm pointing at for quite a while.

However.

Stuff like
Quote:
...Our super caps and capacitor banks will lower the PSU impedance on transients...
is the reason why I wouldn't agree to your statement:
Quote:
...but you might now I am not a BS...


1. A lower PS impedance (ESR) will increase the slew rate = dV/dt ( because RC delay shrinks).
Isn't that what you're trying to say?

2. As a pro you then would need to specify what your're talking about - just put a number to it.

BTW:
slew-rate is the rate defining the change of voltage in a period of time.

Wiki explains it.

And you can also find over there (and elsewhere) that improper slew-rate dimensioning is causing "non-linear" effects. (You asked for creativity the other day.)

I do think it is very important to "know your numbers".
That's why datasheets have been invented in the first place.


Anyhow. I'd like to point out again that my intention is not to attack or talk down the products over here.

It's actually the opposite. From all these 5V HQ audio power supplies in the market that I'm aware of I'd personally would pick Shanti/Nirvana as my first choice just by looking at the feature list.


Cheers
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Old 15th July 2019, 10:10 AM   #216
cdsgames is offline cdsgames  Canada
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OK let me try to answer to the best of my ability .


All voltage sources have impedance . There are quite a few formulas to calculate it but most used its V noload-Vload/A (DC).I used the wrong voltage drop previously

In Shanti case the voltage drop is 0.180mV/3A = 0.06R = 60mOhm (from no load voltage to full load)
(Shanti at low load is 5.2V and maximum load is 5.02V designed so you never get an under voltage on RPI)




Capacitors or supercaps are not voltage sources . They are electrons storage with a slight loss (leaks)


So when load is stable...electrons will be supplied by Voltage source with the stated impedance . Same Voltage source will slightly charge the loss of caps (almost negligible but not 0)


Lets examine now a transient of 0.001Second . Voltage source PSU will sag slightly (LDO , active filters response) and supercaps + capacitors after last active filter will become voltage sources . Of course all impedance will be parallel and they will supply the spike from internal reservoir.


Impedance will change from 0.06R to ..much lower . How much lower you ask ? I never tested , I don't even think it matters how low it will go


Same transient at 0.02S . Most of capacitance (lytics) have arrived at voltage of PSU (and PSU in itself started to come higher V) Suprecaps still have higher V and continue to supply the load transient..


What I am trying to say Soundcheck is that behavior is very complex. I know you want to see a "number for impedance" but as above that number is in function of time and hard to calculate . It changes with load transient vs time


I will test the recovery time of Shanti (thats only one number) but not the impedance/time/A transient


Meanwhile , Shanti is a dual LPS with very good noise and architecture that took in consideration transients (since first day of our design)


At 159$ its rather a good price/quality and beats many...many audiophile super duper PSUs and we do have public test data to show it.





Will I ever have everything you want me to test ? I don't think so. However since you are one of the reviewers of Shanti you are welcome to do so :-) once you get your unit


Yes I think Shanti is a breakthrough . Not because "slew rate" vs impedance vs whatever..


. Shanti is a well engineered LPS with dual outputs with a very good price/what you get .


That's the breakthrough .

Last edited by cdsgames; 15th July 2019 at 10:18 AM.
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Old Yesterday, 01:31 PM   #217
steklo is offline steklo  Germany
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Quote:
Originally Posted by cdsgames View Post
Today testing shows that USBridge draws about 550mA. So its the same, you can use your PSU.. Still note that on power on there is a spike of about 850mA for 200mS

That's good news! But it still leaves the question open how to connect the two rails of the PSU with the combo of USBridge signature and DigiOne signature: Would they still be powered through the two power inlets of DigiOne signature, one for the clean side and one for the dirty side (RPi)?


Would the sonical result be any different with USBridge signature instead of an ordinary RPi in conjunction with DigiOne signature?


Best,
Stefan
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Old Yesterday, 02:33 PM   #218
cdsgames is offline cdsgames  Canada
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Join Date: Jun 2015
Stefan


I cannot answer questions about sonic benefits of USBridge+ Digione Sig feeding your specific DAC.



What I can say , is that test data shows that Boss+ USbridge vs Boss + RPI , THD+N is better on USbridge combo.


On the PSU connection , I am still working on the back plate for USBridge + Digione Sig and should have the final solution this week. (so I will update you then)
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Old Yesterday, 05:03 PM   #219
orangecrush is offline orangecrush
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Join Date: Jul 2010
Hi, just to confirm,

1. If purchasing after market DC cables for the Shanti/Digione SIG combo, I would need two Male DC-2.1G to Type C USB?
2. To purchase Shanti for Canada, still best to go through Allo.com?

Thanks!

Last edited by orangecrush; Yesterday at 05:12 PM.
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Old Yesterday, 05:34 PM   #220
cdsgames is offline cdsgames  Canada
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Join Date: Jun 2015
Orangecrush , all adaptors are included with Shanti


You can purchase from allo or our resellers. (once they get it in stock)
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