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the_doc735

astron lpsu experience?

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I owned 3 of these LPSs. 2 of the 3 has a humming noise that is audible in a quiet listening room. I used them to power a modem and a router and at one point used them to power LPS-1s to get rid of the SMPSs when I didn't have dedicated lines. As for their sonic performance, the SOTM sPS-500 is superior but it depends on what level of sonic performance you want and at what price. If you need an affordable high current LPS, then the Astron is great.

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25 minutes ago, mozes said:

I owned 3 of these LPSs. 2 of the 3 has a humming noise that is audible in a quiet listening room. I used them to power a modem and a router and at one point used them to power LPS-1s to get rid of the SMPSs when I didn't have dedicated lines. As for their sonic performance, the SOTM sPS-500 is superior but it depends on what level of sonic performance you want and at what price. If you need an affordable high current LPS, then the Astron is great.

I would want them for: NAS, Router, 'ONT', FMC (i.e. network side only)...

...object: remove high impedance backwash noise caused by smps in order to keep whole network 'cleaner'. 

cheers!

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On 2/5/2019 at 5:07 PM, marce said:

How do you know you have a noise problem?

high impedance backwash generated by several SMPS.

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45 minutes ago, the_doc735 said:

high impedance backwash generated by several SMPS.

 

Sorry, that's not a thing. 9_9

 

SMPS units have broadband AC leakage on their DC output (both high and low source impedance forms).

SMPS units don't have stellar DC noise performance or PSRR.

SMPS units don't offer broadband low output impedance.

But modern SMPS units complying with current European regulations do not "backwash" into the AC mains very much in the way of switching noise harmonics.  The small amount they do is extremely wideband (hundreds of KHz up to MHz region) and extremely low in level.  I promise that the AC mains in your house already has far greater noise (and at much lower frequencies) running around (especially from lighting circuits but also from the utility itself) than what a typical wall wart or brick puts back into the mains.

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and yet someone put that idea in his head...

(I'm not so sure about the noise levels from the utility tho...??)

 

 

where did you see that, _735?

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3 hours ago, Superdad said:

 

Sorry, that's not a thing. 9_9

 

SMPS units have broadband AC leakage on their DC output (both high and low source impedance forms).

SMPS units don't have stellar DC noise performance or PSRR.

SMPS units don't offer broadband low output impedance.

But modern SMPS units complying with current European regulations do not "backwash" into the AC mains very much in the way of switching noise harmonics.  The small amount they do is extremely wideband (hundreds of KHz up to MHz region) and extremely low in level.  I promise that the AC mains in your house already has far greater noise (and at much lower frequencies) running around (especially from lighting circuits but also from the utility itself) than what a typical wall wart or brick puts back into the mains.

what is the reason then that hundreds of posters on here use LPSU's?

Why do you make them and sell them?

Why don't people stick with their £5 wall warts instead of buying a PH SR7 dual rail for example?

 

many thanks! 🙄

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2 hours ago, the_doc735 said:

what is the reason then that hundreds of posters on here use LPSU's?

Why do you make them and sell them?

 

You are kidding right?  Please go back to my post you just quoted and read the first 3 points—the sentences that start with “SMPS...”

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3 hours ago, the_doc735 said:

what is the reason then that hundreds of posters on here use LPSU's?

Why do you make them and sell them?

Why don't people stick with their £5 wall warts instead of buying a PH SR7 dual rail for example?

many thanks! 🙄

SMPS units have broadband AC leakage on their DC output (both high and low source impedance forms).

SMPS units don't have stellar DC noise performance or PSRR.

SMPS units don't offer broadband low output impedance.

@Superdad 

 

many thanks!

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On 2/5/2019 at 5:07 PM, marce said:

How do you know you have a noise problem?

SMPS units have broadband AC leakage on their DC output (both high and low source impedance forms).

SMPS units don't have stellar DC noise performance or PSRR.

SMPS units don't offer broadband low output impedance. 

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4 hours ago, the_doc735 said:

SMPS units have broadband AC leakage on their DC output (both high and low source impedance forms).

SMPS units don't have stellar DC noise performance or PSRR.

SMPS units don't offer broadband low output impedance. 

Generalisation...

Power supplies can be quiet or noisy it does not matter whether they are LPS or SMPS. SMPS supplies are used everyday in very sensitive equipment with no problems so you can't just generalise.

How do you know you have a noise problem, have you measured it...

If not how do you know you have a problem.

As stated your mains will be full of crud anyway...

A humorous little interlude non the less and very amusing what you did. Pity you haven't answered my question.

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On 2/8/2019 at 12:21 PM, marce said:

Generalisation...

Power supplies can be quiet or noisy it does not matter whether they are LPS or SMPS. SMPS supplies are used everyday in very sensitive equipment with no problems so you can't just generalise.

How do you know you have a noise problem, have you measured it...

If not how do you know you have a problem.

As stated your mains will be full of crud anyway...

A humorous little interlude non the less and very amusing what you did. Pity you haven't answered my question.

no I haven't measured it, but many many articles on the internet say that SMPS is not suitable for Hi-Fi and I am following their advice. Needless to say thay in my past experience somehow the linear always appears to make a vast improvement over SMPS regarless of the techincal ins and outs that I don't profess to fully understand, my ears tell the truth! Yes I know the mains has crud, heard that loads of times too! It's not about elimination of noise, it's about making it the best you possible can! i.e. reduce noise as it can never be totally eradicated. wish I had  £1 FOR every time I have repeated this to 'people'!

AND:

I would like to know what @Superdad thinks about you calling his comments mere generalisations please?

Do you exclusively use SMPS then? If not, why not?

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