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Shanti Dual LPS 5V/3A , 5V/1.5A

Hello ladies and gents.




Music and linear power supply has been always a good match . The main problems of LPS is extremely inflated pricing and no data.



You see not all LPSes are equal . Just using a transformer will not automatically give you a better PSU. Worst is that most of manufacturers include no testing . no data that can help chose one.


We mean to change that.




First we started with the transformer . There are many types of transformer , some are worst than others (noise coupling , electromagnetic interference)

We chose one of the best transformers for noise ,r-core



The transformer has a dual output (galvanically isolated ) so you can power multiple devices (RPI + dac , Katana , etc) and we used independent (of course since they are isolated) filtering on each rail. First a capacitance bank (massive) to reduce the 50/60Hz noise , then a active filter , fallowed by an LDO to keep voltage stable . Since LDOs have poor transient and impedance , we used a last active filter (with good transient) and then capacitance but most importantly , super capacitors on the output . So all power comes in fact from supercaps..So yes , transients and impedance of the LPS is..good.


Of course , Shanti includes AC line filter and AC is earthed to casing.



A few words on what we achieved . Measuring noise (in real word scenario) we see about 80nV (0.08uV of noise from 0-20Khz at the floor of our AP machine. This is comparable to batteries from our internal testing .


As explained , Shanti is not only shining because of the ultra low differential noise, but also because of incredible low impedance / deep reservoir of electrons at the output of the PSU ( thx you soundcheck for your suggestions )



At last ... pricing . We are working very hard to make this LPS the lowest priced on the market . All components are on the way , it will take a few weeks to start accepting orders. Questions and comments are welcomed
 

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And.

The output voltage.

Is it straight 5V?

Many of us would appreciate a little headroom voltage to be able to feed
a 5V regulator. Something like 5.4V would normally do.
Can the outputs slightly be adjusted?


The voltage is in fact 5.1V. Since the beginning we designed it with some headroom You can slightly go higher at 5.2V with no hit on performance (by adjusting a small POT)
 
Ok. That looks better.

I usually account for about 20% headroom to be on the safe side.


PS are usually speced with continuous and peak power and overall wattage.
Would be nice to get all values listed for both outputs.

It would also be nice to see the output impedance.

Can you show us a datasheet?

Ripple, noise etc.


In about a week we will publish all data. We never took impedance readings , so we need to study. Still with the ultracaps right next to the DC wire output, it should be good.
 
We will measure.


However , we are talking impedance at around DC (low frequency) since the PSU is far from load and all HF decoupling must local (next to IC)


Impedance of our lytics + supercaps around DC is quite good (from datasheet)



This is why I am stating " "it should be good"


The output of Shanti is direct from supercaps + around 10.000uf of caps (a few in parallel). Further the active filter has a ESR of about 50mOhm and before that you have another 4500uF of capacitance .
 
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Did you read the article?

It's not about good or bad. It's about matching the load.

As you've seen on Katana earlier. Alternating loads can modulate into the power rail,
causing severe noise through the backdoor.

It's always good to have a look at lab supplies e.g. this as reference.

You'll find a lot about transition times, slew rates asf asf. For a reason!

It's not about "good enough" or "trust me". It's about knowing what you're doing.

And there's a lot to gain for all of us.
Estimated 99% of the projects and findings over here at DIYA are based on trial and error experiences.

And that's IMO not good at all.
 
The paper you are referring to is referenced to a system with feedback . Our Nirvana has a feedback loop , only feedback on Shanti is on the LDO thats well behind output.


Shanti has been tested extensively with different loads manually , but we don't have specific machines to test with variable load.


At last , the way that we designed Shanti was to have full power on output. Even a load that changed from 0.5A to 3A in 10ms , will receive all electrons from output of Shanti . 1F =1V at 1A for 1second


Rest of Shanti power will slowly ramp up as supercaps + cap bank discharge .


So to summarize , Shanti does not have a real feedback loop. Peak power requirements are taken care by output supercaps + cap banks



I am yet to see such architecture in any LPS, but I am sure others will fallow.


It just makes sense.