BUILD THREAD - A New Take on the Classic Pass Labs D1 with an ESS Dac - Page 37 - diyAudio
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Old 9th September 2011, 02:05 PM   #361
opc is offline opc  Canada
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Each channel of the NTD1 draws a constant 235mA on +/-45V rails.
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Old 9th September 2011, 02:08 PM   #362
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So 235mA x 4 rails = 940mA?
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Old 9th September 2011, 02:34 PM   #363
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That's a very confusing way of putting it. You need to specify where the current is coming from or going to. If you're using shunt regs, you'll need to account for the losses there, which are going to be large.

Each 45V supply will need to provide 235mA to the I/V.

So:

Channel 1 +45V = 235mA
Channel 1 -45V = 235mA
Channel 2 +45V = 235mA
Channel 2 -45V = 235mA

Hope this clarifies things.

Cheers,
Owen
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Old 9th September 2011, 02:42 PM   #364
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For only one fuse can I measure the current draws in all DAC + I/V & calculate a 25% more ok?
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Old 11th September 2011, 02:35 PM   #365
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i would really look at what pins on the sabre actually can benefit from a shunt reg, the digital core is just housekeeping, forget it, imo if you are hearing difference with shunts on this pin you are hallucinating. for me the only pins that can stand to have improvement are the analogue supplies, avcc L/R the VDD L/R and the clock. i'll post the details of the pins below, because i see over and over people asking for current ratings of each pin. this is from the ackodac user manual, so i think i'm fine with my NDA

VDD = 1.2V +/- 5% (std digital grade). ~110mA
Supplies power to the core cpu of the chip.

^standard ic reg is fine here

VDD_R = 1.2V +/- 5% (analog low noise). ~15mA
Supplies power to analog_R ref of the chip.
VDD_L = 1.2V +/- 5% (analog low noise). ~15mA
Supplies power to analog_L ref of the chip.

^these should be high quality, so shunts are good here, but only 15ma each

AVCC_R = 3.3V +/- 5% (analog low noise). ~30mA
Supplies power to analog_R output stages of the chip.
AVCC_L = 3.3V +/- 5% (analog low noise). ~30mA

^these should also be of high quality.

Supplies power to analog_L output stages of the chip.
DVCC_T = 3.3V +/- 5% (std digital grade). ~8mA
Supplies power to top pad ring of the chip
DVCC_B = 3.3V +/- 5% (std digital grade). ~8mA
Supplies power to Bottom pad ring of the chip

^^these can be any decent IC reg, the stock onboard regs are fine

Vosc = 3.3V +/- 5% (analog low noise). ~10mA
Supplies power to Crystek XO.

this again should be of high quality.
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Old 11th September 2011, 02:39 PM   #366
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the above is for an 80mhz mclk, so just multiply by 1.25 for a 100mhz clock depending when you got your b2
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Old 11th September 2011, 06:03 PM   #367
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Thanks to share the info qsp, I replaced Tridents 1.2V & 3.3V for SSLV Disco's version (1.2V digital core BII) Salas BiB (3.3V on board Oscillator (VDD_XO), I can say the huge improvement is to change the reg. for Oscillator including it's own dedicate psu & tx.

I have tried LifePo batteries instead AVCC module: I prefer AVCC module.

Last edited by merlin el mago; 11th September 2011 at 06:07 PM.
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Old 11th September 2011, 06:19 PM   #368
qusp is offline qusp  Australia
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yep, like i said, the analogue supplies are worthwhile and make quite a difference (i consider the XO an analogue mechanism), but you are talking about replacing all of them, particularly the 1.2v 110ma VDD supply is a waste of time, money and space to use a shunt for imo. the only ones worth it are the analogue supplies i outlined above ie. avcc l/r vdd l/r (the lower current ref supplies) and the xo
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Old 11th September 2011, 06:22 PM   #369
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Thank you qusp, it's a very good advice because as per your advice I need to reduce heat at the maximum inside the DAC.

OT: Modifiying current I can use for 26 tube preamp so I can compare vs Rod Coleman heaters.
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Old 13th September 2011, 08:03 AM   #370
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hehe no problem, thats why i mentioned it, because i figured your case temp was rising exponentially with the number of shunts in use and no point using space and adding more heat for no upgrade.

have fun!!
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