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Old 25th February 2017, 08:35 AM   #1
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Default Technical question about Audiophonics Linear power supply

Some time ago I bought an Audiophonics ES9023 V3 dac in combination with an Audiophonics linear power supply (Talema / 25VA / 6V / 2,9A / two sorties). Http://www.audiophonics.fr/en/hi-fi-...a-p-10254.html

I think Audiophonics modified this powersupply from 5V to a 6V. And I would like to modify it back to 5V so that I can feed my dac and RPI separately.

How can I modify it back? I can’t see differences between my Audiophonics 6V LPS and the many 5V LPS I see on Ebay (for example Jays Audio 5V LPS). They look exactly the same. I see no other parts.

Or, did Audiophonics change the voltage regulator? On the PCB is printed IRF9Z34 but there is another voltage regulator in the 6V LPS: an IRF9Z34N and their values are not the same. (Also the soldering is a little bit different around the IRF9Z34N). So, is it an idea to replace the IRF9Z34N with an IRF9Z34?

Or is it the TL431AC which has to be replaced?

I hope someone can help me!

Last edited by DJ le Roi; 25th February 2017 at 08:57 AM.
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Old 25th February 2017, 08:40 AM   #2
Mooly is offline Mooly  United Kingdom
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The IRF9Z34 is a FET, not a voltage regulator. It may well be used as a series pass 'regulator' but it plays no part in determining the voltage. Its just used as the control element.
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Old 25th February 2017, 08:42 AM   #3
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Thanks! (I am not very technical). I'll investigate further!
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Old 25th February 2017, 10:03 AM   #4
russc is offline russc  England
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TL431 is a precision shunt regulator and the resistors around it set the voltage.
Look up the data sheet.
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Old 25th February 2017, 10:25 AM   #5
Ketje is online now Ketje  Belgium
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"Tension ajustable via potentiomètre (à l'arrière)"
So, where is the problem ??
Mona
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Old 25th February 2017, 10:32 AM   #6
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With the potentiometer you can change voltage from 5,9 V to 6,2. I cannot reach 5 V.
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Old 25th February 2017, 10:34 AM   #7
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Quote:
Originally Posted by russc View Post
TL431 is a precision shunt regulator and the resistors around it set the voltage.
Look up the data sheet.
Thanks, I think this is the solution, to replace (one of) the resistors.
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Old 25th February 2017, 12:14 PM   #8
Mooly is offline Mooly  United Kingdom
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I see you edited post #1 and added the bit about the TL431 being present. Yes, as others have said, that is the voltage reference. The data sheet will show how the resistor values are calculated, or you can just do it empirically.
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Old 25th February 2017, 12:36 PM   #9
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Default change o/p voltage

simply make Rg2 =Rf2
then output will be Ref V of TL431 times 2 = +5 volt
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Last edited by arthur; 25th February 2017 at 12:39 PM.
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Old 25th February 2017, 01:00 PM   #10
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Default pcb error

need to add a 470r resistor between Pin E of C8550 and its soldering joint in the PCB. This make the CCS working
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