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In Reply to: RE: Linear PSU again: help needed posted by gene_ on December 12, 2010 at 13:19:19
Hi Gene!
It's interesting but photo is small and dark :(
http://cmp2-mihaylov.narod.ru/
Follow Ups:
will be sent tommorow better, this ones just scaled.
Hi guys,
I starting use PIO caps for fitering with great result. Two 2mf PIO caps reduce
noise on 10 db from 10 khz upward , on 5 volt MoBo line, but still some spike.
Sound has changed , more space , cleaner,more impact ,distant instruments and low level signal sound more smooth ,refined.
More experiment on a way , will report.
Gene.
Hi guys,
Continue install PIO caps for filtration on P24 connected by PCB . Again , success .
Noise level drop on 7-9 db according to oscilloscope reading ( +12 MoBo).For +3v MoBo and +5v MoBo added small caps 0.001mf -improvment on 3-4 db,( it is giong to measurement limit of my oscilloscope -90- 95db.).
Sound cleaner, more space. More caps on a way.
I think this is a way forward. Salas shunt regulator splited on two units, last one should
be installed closely to board. Buffalo DAC use also smallest shunt reg., whith connectors
pin just a 1/2 inch long.
Picture show last addition.
Gene.
BTW. How post bigger picture?
"BTW. How post bigger picture?" - In no way unfortunately :( ("All images over 640x480 resolution will be scaled accordingly to reduce bandwidth and storage space."). It is possible to upload here http://imageshack.us/ (for example)
http://cmp2-mihaylov.narod.ru/
Hi guys,
I installed PIO caps on +12 volt CPU line, ( two 6mf caps) but no any good result this time , even added another 47 mf non-polarised cap , not make improvement. Just for experiment I connected my 45 Amp lead battery by short, 150 mm 8 AWG wire to 60 mm long strip of PCB wich is soldered to MoBo- nothing changed. Only option I see now -replace switching regulators. First I am going to try with memory, as JackWrong
did, but will use LT1083 regulator, feeding from original 5 volt spot.
Memory 1.85 volt spot, I find on MoBo ( maybe it is not memory spot ?) very noisy -same as CPU , you can see on picture .
For 3.3 volt MoBo I added two 6mf PIO caps , this give me litlle bit improvement .
Level of a noise same by analyzer , but reading in mv better ( 1.6 mv vs. 3.0mv).
Adding 47 mf non-polarised cap reduced noise just on -2db. Sound- wise I cant see any difference.
Gene.
Jack is not Wrong but Wong ;)
http://cmp2-mihaylov.narod.ru/
Thanks Mihaylov, sorry Jack !
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