Re: Meanwell Single, Bipolar and Triple Output Switching Power Supplies for Audio Projects
Posted: Sat Feb 13, 2021 2:48 pm
Further tests are showing the 13k5 and 19k2 bumps to be environmental. Perhaps the 240 you see is too.
https://www.proaudiodesignforum.com/forum/php/
https://www.proaudiodesignforum.com/forum/php/viewtopic.php?t=943
I had a chance to test an EljinTek GPSN25 +/-16V unit. (No 5V output.)mediatechnology wrote: ↑Thu Mar 29, 2018 7:23 am The following oscillograms show why I recommend the discontinued Meanwell P25A over the replacement GP25A. Both supplies had thier 5V outputs loaded in the minimum 500 mA. The 30V load was light IIRC about 50 mA.
The top image is the GP25A. The upper trace the +15V output the bottom is the -15V rail.
Meanwell GP25A14E-R1B Ripple
The discontinued P25A has far lower ripple and noise.
Meanwell P25A14E-R1B Ripple
The DSO is sampling at 25 kS/s to show the LF ripple. The GP25A's HF ripple is just as ugly.
The previous FFTs were the output of a board powered by both the P25A and GP25A. The PSSR ratio of the onboard devices is pretty good at LF but out-of-band HF response does show degradation with the GP25A.