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Old 1st October 2010, 07:53 AM   #351
rtd is offline rtd  France
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I guess this board correspond to the final schematic at post 193 where source of the mosfet sits at 1.65V (value SABRE expects to see). Is it possible to adjust it 0v DC or does it require to change many values ?
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Old 1st October 2010, 09:06 AM   #352
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yes, you can adjust bias with the onboard resistive pots
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Old 1st October 2010, 04:12 PM   #353
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qusp,

Glad that was useful. IIRC, Jan Didden was advocating using the 1085 for both the positive and negative supplies due to the better measured performance of the 1085. I don't know if that's feasible here though.
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Old 1st October 2010, 04:16 PM   #354
qusp is offline qusp  Australia
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oh I have them already, they are great regs and are definitely leagues ahead of the 317/337, I just wasnt thinking straight re floating and not being effected so much by the supply voltage as long as the input/output differential is not crazy high. there are much nicer regs from linear too that I have here, but none of them are suitable due to having a ground reference. thanks for reminding me of them though, I was determined to find something in their low noise range that would work, but nothing is suitable for a GB.

dunno about using it for both poles, interesting, will have a search for this post

Last edited by qusp; 1st October 2010 at 04:19 PM.
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Old 1st October 2010, 04:34 PM   #355
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Default SMD resistors

SMD resistors low wattage:

Rs online:

+-10ppm 0.1% tolerance:
Panasonic 105 values 470R-100K
Tyco 888 values 2R-464K
Vishay 28 100R-1Meg

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Farnell:

+-0.01% tolerance
Vishay Dale 15 values
Vishay foil resistors 19 values
100R to 100K

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Mouser:

+-0.02% tolerance 5ppm
Susumu RG Series Ultra Precision Thin Film Chip Resistors values range from 100R to 10K

0.1% tol +-25ppm
Panasonic
47R to 1000K

-----

DigiKey:

+-5ppm +-0.02% tol
Susumu RG Series
100R to 20K

-----

That's about qualities shopping on line, when B.O.M. published with exact values I can see where are cheapest.

Last edited by merlin el mago; 1st October 2010 at 04:43 PM.
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Old 1st October 2010, 05:31 PM   #356
qusp is offline qusp  Australia
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forget farnell and RS, both are ripoff!! sumumu are def my favorite thin film and mouser has a good range of them in stock. I prefer mouser mainly because of the free international fedex 2 day shipping after 200 dollar order . of course there is the SMD zfoil range, but they are like 14 dollars a pop, though I still may choose 1 or 2 positions worthy of them just because. of course I just made a 400 dollar order with mouser yesterday, but I usually make a regular order every 2 weeks; hows that BOM going Owen?
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Old 1st October 2010, 05:32 PM   #357
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Quote:
Originally Posted by qusp View Post
dunno about using it for both poles, interesting, will have a search for this post
It is here.
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Old 1st October 2010, 05:35 PM   #358
qusp is offline qusp  Australia
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another one worth a look is the vishay MELF range, which is basically a metal foil resistor in smd
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Old 1st October 2010, 05:37 PM   #359
qusp is offline qusp  Australia
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aha, yeah center tap, not always doable. funny thing, I just checked the mouser catalogue for the smd ZFOIL and they want 53aud each lol. better off getting a GB together and contacting them directly. its not supposed to be soldered by hand either due to the dielectric being easily scratched with tweezers, but a steady hand and quick action its no problem

Last edited by qusp; 1st October 2010 at 05:40 PM.
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Old 1st October 2010, 06:08 PM   #360
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Quote:
Originally Posted by opc View Post
Can anyone suggest some "Audiophile" grade linear regs that could be used in place of the LM317/337?

I'm just making the BOM now, and if people feel like spending more on these, then I'd like to give them the option. I need a Vin of 60V Vout of up to 50V and at least 250mA of current capability.

I have heard great things about the Salas regs, but they're fully discrete and it would mean that I would have to design them in, order parts, test the circuit, and then redo the layout for them. All of that takes time, and I like to get these board out the door.

Cheers,
Owen
I'm using Salas regs. V1.0 with remote sense Vin 55V & Vout 46V/500mA, no problem with the current capability can be fixed with the resistor R1, the only issue is the heat & is totally stable.

If you want can I ask Salas to design Vin 60V & Vout 50V / 250mA?

Cheers
Felipe
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