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Gieseler Audio

Low noise power supplies, 5v, 9v & 12v.

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I had a good chat with Marc the other day & we both agreed that some good quality low noise 5v, 9v & 12v locally produced power supplies would go down well.

I have already done quite a bit work in this area & have built several 12v Intel NUC psu's which customers were most impressed with. I know there are lots of low priced units on EBay but they generally use low quality parts especially in the filter cap, diode  area & the mains input voltage is often a bit low ie. 220v. There are some great units coming out of the US but with our plummeting dollar & high postal cost don't represent good value. What I am proposing is two models & both  will be powered by external fully AUS  approved 240v AC transformers. I love using external AC supplies as  I then have full control over rectification filter cap choice etc.. OK so a 5v or 9v (pick voltage on order) at about 2A & a 12v unit at 2.5A. I am limited to these maximum currents by the external transformer choice, trying to keep everything legal & approved. I know you guys like to see massive current ratings but even a mini itx MB only draws about one amp after initial start up surge. I find diode & capacitor choice has a much bigger effect on sonic qualities than an outright current rating.  Case style will be the same as the Klein DAC series as I have this well sorted now. Canadian manufactured Hammond extruded aluminium case with slide in PCB & zero internal wiring. I will be using high spec very low noise regulators. That give great protection & will make them short circuit proof. Noise levels from these are now the same as the boutique  super regs that are so popular.   Marc also suggested the possibility of a DIY version ie populated board only which could be fitted into a custom server case. Lots to think about & any feed back much appreciated.

 

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Is there enough room in the box for 2 x selectable dc outputs? Let's face it, some of us have more than one dc toy! One for SBT, another for usb power for/or another source/server/dac?

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Great idea Clay. It might help if you can provide some measurements for comparison with commercially available units (in particular HDPlex, HS-2 and the like).

Richard

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Great news.

I was lucky to have member @AJ build me one a couple of years ago with dual output. He is in New Zealand now so that is not available AFAIK.

With the US$ where it is I think it is an excellent idea. We need Australian products for ourself.

My wishlist:

  • Choices in enclosure - especially if you are going down the DIY route (Which may or may not be a good business decision?) Also if someone has a Nuc, those of us with OCD want the boxes looking the same - for example: the iFi products and the Cyrus products.
  • One output is not enough. Maybe have a base model with only one output, but I agree with @@christosd that many of us want to power more than one toy. E.g. usb/spdif, squeezebox touch, server/pc, so I think there is demand for models with more than one output.

@@Chanh and @@Tasso what are your comments based on your experiences with music servers?

 

Not sure how  cabling works with all the different connection options out there?

Edited by Jventer

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Great idea Clay. It might help if you can provide some measurements for comparison with commercially available units (in particular HDPlex, HS-2 and the like).

Richard

Agree

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Great idea. I've got a HDPlex unit at the moment and the flexibility of multiple outputs is fantastic.

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Guest Hensa

Excellent idea - I've often drawn a blank looking locally for a decent power supply.

 

A couple of questions if I may:

 

  • Are you talking about AC to DC power supplies or AC to AC?
  • Will there be options with respect to the output connector as these can come in different sizes?
  • Any possibility of a 24VDC model as this is what I'm looking for for my phono stage?

Thanks Clay.

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 What I am proposing is two models & both  will be powered by external fully AUS  approved 240v AC transformers. I love using external AC supplies as  I then have full control over rectification filter cap choice etc.. OK so a 5v or 9v (pick voltage on order) at about 2A & a 12v unit at 2.5A..... 

Marc also suggested the possibility of a DIY version ie populated board only which could be fitted into a custom server case. Lots to think about & any feed back much appreciated.

Great initiative! I concur that quality diodes and electrolytic are most critical, follow by low noise/ripple regulator(s). Do you have a preliminary schematic in mind? Lastly, what is your estimate cost of the final 12VDC unit?

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OK,  multiply outputs. 5v & 9v in the one box is no problem but adding 12v as well gets a bit tricky. The HDPlex has a multi tapped power transformer. I don't have the luxury & for me to put a 240v transformer in a case I would need C tick & safety approval, big dollars.  Also the total current draw can only be what the transformer is rated to.

For the 5v + 9v supply I would be using a 10v 2.4A external transformer (same as Klein DAC) so the total current output current available would be 2.4A. It sounds like all this this could be quite popular so I could certainly have a range of models including a multi voltage ones. Initially I was thinking  the main applications would be -  DIY music servers using ARM cored boards eg. Rasberry Pi, logitech Squeezeboxs, USB Regens, DAC's & NUCs but I may have to rethink this.

Noise levels.  I was thinking of using say a SOTA low noise reg eg TPS7A4700 (noise 4uVrms 10hz - 100khz) & beefing up the current output to get 2 - 3 Amps. I will have a good look at the noise levels of popular PSU's out there & make sure mine have similar or lower levels.

re question on output. All supplies will run from external AC transformers (240 v AC in) & output DC only voltages.  At this stage no 24v output versions.

PS Hi Chanh, good to hear from you.

Yes I do have a folder with a few favourite schematics. I will post a rough overview once I decide which one to use. I have a nice new 100 mhz Techtronics Scope so I can see results better now.  pricing on 12 v unit, I have done a few of  those before & they sold for $350. I will probably need to go through all the costing again & will do an update shortly.

Edited by Gieseler Audio

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Great idea Clay  :thumb: 

9v + 12v combo unit would be awesome for my pc / sotm card build.

Count me in mate!

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