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Old 3rd December 2011, 12:20 PM   #1
Marra is offline Marra  United Kingdom
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Default Xono current draw

Does anyone know the maximum current draw of the Xono phono stage?
Thanks Marra
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Old 5th December 2011, 07:51 PM   #2
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It's Class A device, power draw is constant at about 18 watts, including the losses in the powersupply.

Cyclotronguy
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Old 5th December 2011, 08:36 PM   #3
Marra is offline Marra  United Kingdom
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Thanks cyclotronguy. I was hoping someone would tell me what it uses in terms of plus and minus in milliamps so that I can build the appropriately rated Salas Bib shunt regulators to power it.
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Old 5th December 2011, 09:02 PM   #4
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Original X-ono large PS has very little in the way of regulation. Small PS had none. Sounded pretty spectacular without.

Cyclotronguy
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Old 6th December 2011, 07:58 AM   #5
Marra is offline Marra  United Kingdom
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Quote:
Originally Posted by cyclotronguy View Post
Original X-ono large PS has very little in the way of regulation. Small PS had none. Sounded pretty spectacular without.

Cyclotronguy
How true; but as I have bought and part stuffed the regulator boards it seems a shame not to give them a try.
I'll reread the Ono'Xono threads and see if the current draw gets mentioned in them.
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Old 6th December 2011, 05:41 PM   #6
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As previously indicated CA 15W from the wall on production pieces, so +/- 8watts ought to cover it. BTW standard PS was +/- 44 Vdc.

Cyclotronguy
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Old 10th December 2011, 12:47 PM   #7
Marra is offline Marra  United Kingdom
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PCB Voltages & Current Measurements:

Q24 emitter
24.8V (Schematic 26V)

Q14 emitter
11.6V (Schematic 15V), Q10-Q13 are 2SK170BL Type

Q15 drain: 11.9V

Q10-Q13 Is: 4.1, 4.2, 4.2, 4.1ma (PCB #1)
Q10-Q13 Is: 4.2, 4.3, 4.4, 4.4ma (PCB #2)

D5 Anode: -27.8V

R67-R53: 1.2V = 8ma Ie Q16,Q17
R64: 0.9V = 1.9ma Is Q19

R28: 0.35V, adjusted with R25

Output FETS are warm, not too hot.

Supply Currents:
+30V, 120ma
-30V, 80ma

I knew I'd read it somewhere.
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