Power Supply for Squeezebox Touch

[jrebman]

Anybody out there feel like doing me a huge favor and translating the schematic for the swenson power supply into words for me?

I just bought a sb touch and will send it to Bolder Cable for analog mods, will then tweak with the soundcheck 3.0 tookit, but also want to build a killer psu for it.

Does it look easy to slightly change the output voltage of this design -- say from 5.0 to 5.7 or 5.8?  I have a bybee music rail I may want to try in it later and that eats up about .7-.8v itself.

Thanks,

Jim

 

[Grainger49]

Jim,

If you mean the schematic posted on the previous page by Lar, I can do that.  The regulation comes from an LT1084, a fixed 5V three pin regulator.  A variable regulator can be substituted and you can dial in the voltage you want. 

 

[jrebman]

Thanks, Grainger, and yes, that's the one.  Please, if I may ask, include all parts designations such as type, size, series, etc. -- according to Hans, the types of caps are important too, as is I suppose just about everything else.

Thanks much,

Jim

 

[2wo]

I will give it a go.

Transformer, Triad VPS10-2500. Across the Secondary, is a stubber consisting of a .022uf cap  in series with a 330 ohm resistor.

To a full wave bridge, STM STPS20120D is the listed diode.

Next is a CLC filter. All caps are  Panasonic, 35V.

120uf, FC
10mh, Hammond 159 ZJ
10000uf, TSHA.

This feeds a 3 pin LT1084 regulator. The input has a 470uf, FM, essentially in parallel with the 10000uf cap, just closer. P3 (input) to P1 (ground).

Then another 470Uf , FM. From the output (P2) to ground, (P1)       

 

[jrebman]

John and Grainger,

Thank you both very much!  You guys rock!  Seems simple enough but the  devil is in the details.  Just wondering why such a monster of a bridge -- maybe diodes are less noisy when used at far lower than their rated current?

I may even have a nice split-bobbin transformer I can sub.  I may even have 90% of these parts on-hand.

Anybody know the O.D. and I.D. for the DC barrell connector for the Touch?

Thanks much -- love this forum!

-- Jim

 

[HF9]

Nice work on that 5V PS Lar, looks very nice

 

[grufti]

...  Just wondering why such a monster of a bridge -- maybe diodes are less noisy when used at far lower than their rated current?

...

-- Jim

Like the idling motor in a car: very little noise. Wait until you hold the choke in your hand. That qualifies as monster also.

 

[Lar]

John and Grainger,

Thank you both very much!  You guys rock!  Seems simple enough but the  devil is in the details.  Just wondering why such a monster of a bridge -- maybe diodes are less noisy when used at far lower than their rated current?

I may even have a nice split-bobbin transformer I can sub.  I may even have 90% of these parts on-hand.

Anybody know the O.D. and I.D. for the DC barrell connector for the Touch?

Thanks much -- love this forum!

-- Jim

O.D. - 5.5 mm  I.D. 2.5 Long - 11.0mm     plug size but that should help.
http://ca.mouser.com/ProductDetail/Switchcraft/760/?qs=sGAEpiMZZMu2f9RNbWupYubSmEXlq6O0Wd4VeTPXD68%3d

 

[jrebman]

Lar,

Thanks very much -- doubly so for the mouser part number.

Got the new Touch yesterday and I'm pretty impressed with the quality of the piece -- as compared to the original SB, sb2 and sb3 -- all of which I've had in the past.

Did you take the electrolytic coupling caps out of your analog outs or are you just using it as a transport?

-- Jim

 

[Lar]

Lar,

Thanks very much -- doubly so for the mouser part number.

Got the new Touch yesterday and I'm pretty impressed with the quality of the piece -- as compared to the original SB, sb2 and sb3 -- all of which I've had in the past.

Did you take the electrolytic coupling caps out of your analog outs or are you just using it as a transport?

-- Jim

I`m only using the digital out, its all stock, as well as the new firmware for 24/192 output. I have an Emotiva Dac connected to it, impressive sound out of a little box. http://forums.slimdevices.com/showthread.php?94512-Announce-Enhanced-Digital-Output-app-USB-Dac-and-192k-Digital-Ouput

 

[Lar]

Nice work on that 5V PS Lar, looks very nice

Thanks, which box are you referring to? I built two?

 

[Noskipallwd]

Hey Lar, so you are running USB out to the Emotiva DAC. I've heard good things about that relatively inexpensive DAC. So is it asynchronous? I am just using optical out on mine, of course tht is limited to 24/96. I guess I will have to install the firmware upgrade and give it a try.

Cheers,
Shawn

 

[Lar]

Hey Shawn, I`m using the coaxial out, the Dac is limited to 16/48 in USB, unless you use USB>SP/DIF converter so i just went coaxial. At 199.00 its a steal, but I expect they are coming out with a new one in the near future to address the USB shortfall.