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The switched PSU chirps
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FritzS View Drop Down
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    Posted: 24 Mar 2008 at 8:30am
One disadvantage of all "Green" products I have - the switched PSU chirps, the new from Reflex more than which from the Solo.

I want to make my own dual 24V PSU - one for both amp's.

With two separated transformers (a good with EI core!?) and the WNA cascode circuit (I have a PCB) - use two cascoded LM317 for each channel. I have some LM350 in my stock ...

Or should I use the JLH design that Sandy suggested?

Edited by FritzS - 24 Mar 2008 at 8:32am
AKG K812, K872, K712, Q701, K701, K501, K550, K271, Denon AH-D 7000
"Green" SOLO (with LME49860NA), WNA MKII
Marantz SA7001 KI, Philips CD650
Revox B790, G1042, Reflex
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Points: 16314 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 24 Mar 2008 at 1:54pm
Hi FritzS,

Please explain further if you can this chirping. I know they make a high pitched sound that can be heard at close quarters, but I've never heard them chirping (like birds do?). I realise there have been about 3 or 4 people who took part in the "green" trial who have said the same, but there were over a hundred who have not. Maybe it could be the polarity? In Austria you can plug them in either way? Maybe they need to be plugged so each is in the same phase? This is the reason why we were selling them so cheaply - to get feedback so we could effect a cure for these "teething troubles" - this is why several companies do product trials before general release. I would really like to fully understand this problem (if it is a problem) so I can put the SM-PS powered products on general release.

As for a dual 24V PSU, I wouldn't. All our products use single rail. And as they're designed to work properly on SM-PS it would make sense for us to effect a cure so they remain on SM-PS. Please try and describe the problem in greater depth, and if language is a barrier do you have somebody who can assist with communication? I don't mind it being discussed here as we are an open and transparent manufacturer.
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FritzS View Drop Down
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Points: 134 		Post Options Post Options   Thanks (0) Thanks(0)   Quote FritzS Quote  Post ReplyReply Direct Link To This Post Posted: 24 Mar 2008 at 3:04pm
Originally posted by Graham Slee Graham Slee wrote:

Hi FritzS,
Please explain further if you can this chirping. I know they make a high pitched sound that can be heard at close quarters, but I've never heard them chirping (like birds do?). I realise there have been about 3 or 4 people who took part in the "green" trial who have said the same, but there were over a hundred who have not. Maybe it could be the polarity? In Austria you can plug them in either way? Maybe they need to be plugged so each is in the same phase? This is the reason why we were selling them so cheaply - to get feedback so we could effect a cure for these "teething troubles" - this is why several companies do product trials before general release. I would really like to fully understand this problem (if it is a problem) so I can put the SM-PS powered products on general release.


The chirping comes direct from the SM-PS, and I hear this wihout connect to the Reflex, only a bit quieter without load. I turnded arround in connector, it's the same. The Solo SM-PS chirps too but silent. Next time I will precise analyze this problem. If I run the burning in I hear the silent chirping on every side in the sitting room. I must see if I have a mic to record this ....

Quote
As for a dual 24V PSU, I wouldn't. All our products use single rail. And as they're designed to work properly on SM-PS it would make sense for us to effect a cure so they remain on SM-PS. Please try and describe the problem in greater depth, and if language is a barrier do you have somebody who can assist with communication? I don't mind it being discussed here as we are an open and transparent manufacturer.


I know you use single rail - I mean a dual single rail 24V PSU = two separeted conventional  24V PSU's in one case. Your "Green" products working with a conventional 24V PSU too, or?


Edited by FritzS - 24 Mar 2008 at 3:15pm
AKG K812, K872, K712, Q701, K701, K501, K550, K271, Denon AH-D 7000
"Green" SOLO (with LME49860NA), WNA MKII
Marantz SA7001 KI, Philips CD650
Revox B790, G1042, Reflex
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Points: 16314 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 25 Mar 2008 at 10:29am
FritzS, does the SM-PS PSU chirp once connected and powering the products it is intended for?
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Points: 134 		Post Options Post Options   Thanks (0) Thanks(0)   Quote FritzS Quote  Post ReplyReply Direct Link To This Post Posted: 25 Mar 2008 at 10:46am
Originally posted by Graham Slee Graham Slee wrote:

FritzS, does the SM-PS PSU chirp once connected and powering the products it is intended for?


It chirp (more a higher frequent tone 5 .... 10 kHz) with powering the Reflex, and it chirps a bit softener if nothing powered. Turn arround in main-power socket - it's the same.

The other from Solo chirps more silent.

I reckon a wire in the tranducer "sings" Tongue



I measured about 80 ... 90 VAC between the output and main-ground (protection-earth), but this at all of my three SM-PS PSU's (two from you, one from WNA).


Edited by FritzS - 25 Mar 2008 at 10:56am
AKG K812, K872, K712, Q701, K701, K501, K550, K271, Denon AH-D 7000
"Green" SOLO (with LME49860NA), WNA MKII
Marantz SA7001 KI, Philips CD650
Revox B790, G1042, Reflex
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Charley Phogg View Drop Down
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Points: 108 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Charley Phogg Quote  Post ReplyReply Direct Link To This Post Posted: 27 Mar 2008 at 6:40am
I've only unplugged my Solo a few times,and from what I gather in doing so, it seems to me that it depends on how you plug it in. Example, into outlet first then into Solo, or Solo first then outlet. I just can't bare to umplug it. Maybe I should try and see what I come up with. I'll do my best to trey and be without it and take notes to inform what I find. I'd take a day to evalute it, but thats a tall order Nuke considering how much I listen to it Clap .

 
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Points: 134 		Post Options Post Options   Thanks (0) Thanks(0)   Quote FritzS Quote  Post ReplyReply Direct Link To This Post Posted: 30 Mar 2008 at 6:41am
The SM-PS “chirping”  nasty quite alone too – without any amps to load – it’s only a SM-PS problem, that have nothing to doo with the Solo or Reflex amps, nothing to do with grounding to earth! One building component inside the SM-PS, transducer or cap, chirps. I think it’s a series-fault of the SM-PS.

Sometimes I read about similar “chirping”  in notebooks, SAT receiver, DVD player, etc. that use switching regulators – some shift for oneself – a drop of coating on the transducer wires helps mostly. But I cannot open the SM-PS without destruct.




Edited by FritzS - 30 Mar 2008 at 7:04am
AKG K812, K872, K712, Q701, K701, K501, K550, K271, Denon AH-D 7000
"Green" SOLO (with LME49860NA), WNA MKII
Marantz SA7001 KI, Philips CD650
Revox B790, G1042, Reflex
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