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Old 26th April 2010, 02:10 PM   #31
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OFF hm, i cant delete, there is no button, what i am doing wrong?
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Old 22nd October 2011, 05:41 PM   #32
rha61 is offline rha61  France
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I'm currently testing your "electronic cap " PSU on a AK4396 DAC
It sound really very good
Thanks Nazar
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Old 23rd October 2011, 10:55 AM   #33
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you’re welcome!
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Old 9th January 2013, 08:53 PM   #34
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Hi Nazar,
I'm building your PSU for my RIAA phono (LME49990 in, passive RIAA, LME49713 out). I have 100n from the schematic (output caps) very close to my
power in pins on the 49713 but not as close for the 49990.
I was wondering, do I still need local bypass caps? I was thinking of 4.7uF MKP parallel to 100n NPO, from each rail to GND.
Thank you
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Old 11th January 2013, 10:25 AM   #35
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Hi Milos, use 0.1NP0 between + and -, and 1-4.7u MKP from +,- to ground (not necessarily, use you ears to determine what is best).
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Old 11th January 2013, 10:47 AM   #36
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Nazar,
thank you. Any drawbacks for using R1-R9 47ohm and C3-C7 470uF?
I have +/- 23V after the rectifier and I need +/-15V (@~20mA).
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Old 8th February 2013, 09:38 AM   #37
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no problem, but 317/337 need input voltage min=output voltage+2..3V
And line volrage instability (180-242V)
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Old 10th February 2013, 01:57 PM   #38
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Thanks.
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Old 11th February 2013, 02:05 PM   #39
marce is offline marce  United Kingdom
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SUPPLY BYPASSING
To achieve a low noise and high-speed audio performance, power supply bypassing is extremely important.
Applying multiple bypass capacitors is highly recommended. From experiment results, a 10μF tantalum, 2.2μF
ceramic, and a 0.47μF ceramic work well. All bypass capacitors leads should be very short. The ground leads of
capacitors should also be separated to reduce the inductance to ground. To obtain the best result, a large
ground plane layout technique is recommended and it was applied in the LME49990 evaluation board.

Most op-amp manufacturers produce a guideline and app notes for decoupling, use engineering not your ears (they tell you nothing about decoupling), this is more critical these days because of the amount of RF and other high frequency noise present in the envoironment.
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Old 12th February 2013, 09:03 AM   #40
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Quote:
use engineering not your ears
our ears perfectly hear result of good decoupling etc (and of good PCB tracing, low EMI, etc etc etc)
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