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Gieseler Audio

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

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Hi Guys,

Sorry for the delay but I have had a big rush on Klein DAC orders so I’ve been flat out with that.

I have done some prototyping & testing on the power supplies though & have come up with the design for the first two basic models.

Model One.  5v or 9v @ 1.5A It will have a single output which can be 5v or 9v selectable via a recessed switch on the rear panel. Power source will be the same as the Klein DAC, external 10v AC  2.4A transformer. The output connector will be a Neutrik female XLR socket with gold plated pins. For the DC power lead I have picked a good quality 10A 600mm long type with a pre made moulded on barrel connector. This type is far more durable than making up one with the usual DC barrel plug. It will be available in the usual 5.5mm dia with either 2.1mm 2.5mm centre pin size. Custom or odd sized ones can be requested on ordering. The cable will be terminated with a matching Neutrik gold pin male plug. The Neutrik XLR connectors are very good with a 16A rating (3 pin), low contact resistance & far better that the usual flimsy CB microphone types that a lot of supplier use.

Model two. The same as above but with a fixed 12v output  @  1.5A.

OK tech stuff on the DC output quality. After trying various combinations I’ve gone with a tracking pre reg cascaded design using low noise Japanese LDO regulators. I have my own shunt & super reg designs which are great but in this application the cascaded tracking pre reg works best.  I have also done a little circuit tweaking with CCS’s & CLC filtering. The output is current limited & short circuit proof. As usual all electronic components will be of top quality. Cree Schottky SIC Diodes, Nichicon Fine Gold & Elna Silmic II caps, Vishay resistors & the whole lot on a high quality PCB with Zero internal wiring. I’m just waiting on a new low noise active scope probe but from initial testing & calculations the output noise level should be around 20 to 40 uV’s  & ripple rejection 100+ db. Using an external transformer gives super low hum levels as well. I have not tried to achieve ridiculously low uV noise levels as this does not automatically equate to the best sound quality. I remember once during a PDX DAC tweaking exercise I removed the well implemented  LM317/337 design & replaced  it with super spec  mega low noise regs & it actually sounded way worse.  This design is similar to my previous 12 v NUC unit which received excellent feedback on its sonic qualities, Bill Hobber feel free to comment!  I’m hoping to get the PCB design finalised this weekend & send it to the fabricators  so  all going well I should have some finished units ready for sale in a couple of weeks. Costing? Definitely under four hundred but I will I need to check figures again & will get back with a final price over the weekend.  

Regards Clay 

Edited by Gieseler Audio

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Devialetar has informed me that the newer Intel Celeron NUC's require 19v so I will make one at that voltage as well.

Edited by Gieseler Audio

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I'm guessing that my little Chinese 12v 1.5A supply for my Bel Canto CDP would be a prime candidate for this. Wonder if there would be sonic improvements given that I only use the digital out from it (transport)

Edited by Grimmie

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\Bill Hobber feel free to comment!

 

At the moment I have lent my Off Ramp with Clays previous power supply to Mike Lenehan.

 

I am hoping to pop down to Clay soon to drop off my Truth pre so he can check it against his new pre.  Its a tough test - the Truth is very transparent - at first I thought it utterly transparent - but extended listening show it wasn't.  If Clay can have a 12v supply ready we can see what it does with the Off-Ramp.  I am not using my Nuc now (switched over to my Oppo) - probably will sell it later but can see what the new PS does to that compared to the older one.

 

Thanks

Bill

Edited by bhobba

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Mac mini 2009 psu's

I thought I would do a post here rather than multiple PM's. I won't be doing a version, the main reason is that Apple used a very odd ball power plug that does not seem to be available anywhere. Power requirements are quite high too at 18.5 v 6A. IMHO it is probably not worth paying big dollars for a MM LPS as due to their age (6yrs) failure rate would be getting higher now. I used to do a lot of warranty work & the capacitor failure rate of modern equipment after 5+ years is high. Anything with a soft touch power switch has quite a bit of internal circuitry powered on 24/7 so the caps are wearing out even in standby. Anyway just my two cents worth.

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And 16 VOLT 1amp for the Auralic Mini if possible.

 

Scumbag.

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noted & confirmed

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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.

Clay,

 

I've been on a never-ending search for any local versions of the old RS-1 power supply for Rane products of about 20 years old or more. They produce 18vac and do it via "telephone" cables. I've attached the old datasheet. I currently have 2 of the fpe13 parametric EQ's that I want to use and I might look for one of the crossovers, if a 3 or 4 output power supply could be located or built.

 

I went as far as buying some Harbuch transformers, but as usual, but intentions are far too big for my technical skill.

 

Any suggestions?

fpe13dat.pdf

fpe13man.pdf

rs1dat.pdf

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Hi cloth ears,

Rane gear, nice. I setup a three way active speaker system at home once using one of their crossovers. Worked well.

Now to your power supply. 18 v AC with a centre tap & via rj45 plug. Unfortunately I have nothing even remotely like that. I suggest you find a local Tech & get him to make up one for you. Maybe do a post in the DIY section asking for recommendations on some Vic techs.

Cheers Clay

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Hi Guys,

Sorry for the delay but I have had a big rush on Klein DAC orders so I’ve been flat out with that.

I have done some prototyping & testing on the power supplies though & have come up with the design for the first two basic models.

Model One.  5v or 9v @ 1.5A It will have a single output which can be 5v or 9v selectable via a recessed switch on the rear panel. Power source will be the same as the Klein DAC, external 10v AC  2.4A transformer. The output connector will be a Neutrik female XLR socket with gold plated pins. For the DC power lead I have picked a good quality 10A 600mm long type with a pre made moulded on barrel connector. This type is far more durable than making up one with the usual DC barrel plug. It will be available in the usual 5.5mm dia with either 2.1mm 2.5mm centre pin size. Custom or odd sized ones can be requested on ordering. The cable will be terminated with a matching Neutrik gold pin male plug. The Neutrik XLR connectors are very good with a 16A rating (3 pin), low contact resistance & far better that the usual flimsy CB microphone types that a lot of supplier use.

Hi Clay,

 

Would this model you mention here suit a W4S Remedy Reclocker?

 

Cheers,

 

Tarkan.

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