mamsterla Wrote: > > I built a separate PS supply that is housed in project box and made up > of: > > 1 LT1086ADJ regulator >
coincidentally i was just playing around with regulators today on my Sony SACD player DAC supply. i recently reworked the entire supply on a perfboard to get the impedance lower. i also added a RC "snubber", which made a very appreciable improvement in sound quality. my values are not optimal, i am using 5 ohms in series with a .047uF Pana P cap since it's what i had on hand. this is one application of a film cap that is ok IMHO in a high speed supply - as a HF stabilization element when used in conjunction with series resistance, since the R dampens the reactance from parasitic inductance. i had also changed the garden-variety 7805 regulator to a LT1086-CT5, which is the 5V fixed version of the LT1086 you're using. someone told me however that the LT regulators are *not* better sounding, and actually have higher noise than many 78xx parts. while the adjustable version obviously has better noise performance with proper decoupling of the ADJ pin, some people feel the low-dropout design is not the best for sonics. anyway, on that person's suggestion i switched back to a 7805, and he was right - it sounds quite a bit better. interestingly, the difference in sound quality between regulators was not as big as the impact of the snubber, but that may be a function of me having the wrong RC values. in any case, thought you guys might find my results interesting. i should emphasize that this PS stuff is not as simple as it may seem - "better" parts do not equal better sound quality. btw, a very knowledgable person (the originator of the snubber idea actually) told me to try the LM340T-5 regulator as an alternative to the 7805. he also has the snubber values calculated already, so i may give it a shot. cheers, dorkus -- dorkus ------------------------------------------------------------------------ dorkus's Profile: http://forums.slimdevices.com/member.php?userid=3373 View this thread: http://forums.slimdevices.com/showthread.php?t=19822 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
