Quote: Originally Posted by Edwood I can't believe I missed this thread. I might have seen eye to eye with Rick over the years water under the bridge man.was not important and to be honest did get the bland days up a tickn around the then joint Quote: , but I know...

http://www4.head-fi.org/forums/showt...threadid=21563

Quote: Originally Posted by peranders I had information from a National guy that they weren't identical but performance wise they seem to be similar at least. Weak man.not even close to "conclusive" evidence If by different the "National guy" means they are in different...

Quote: Originally Posted by peranders LME49600 is not identical to BUF634, better in fact. Have you actually compared the two ? Read the available data beyond the "hyped up" press in the trade rags ? compared the internal structures ? For instance ; The only difference in...

The National LME49600 is the BUF634 "rebranded" with the only difference being the buffer package 8-Pin DIP & TO-220 for the BUF634 http://focus.ti.com/lit/ds/symlink/buf634.pdf TO-263 SMD for the LME49600 http://www.national.com/ds.cgi/LM/LME49600.pdf Maybe Brown dog will...

mostly in the bypass position but some for music mastered to sound good on POS systems or on a cheap a*s radio I "tweaK" the curve a bit to get rid of the boom and tizz.I also notice some of the old R&B can use a bass cut and some a treble boost around 10K to sound right on a high res system...

went from a strapping young man with gobs of loot and a boatload of gear to old,broke and gearless

Quote: Originally Posted by sacd lover rickcr52 .... I like that! Happy Birthday!! Figured you would dude.I also figure some would not mind "Rickcr52" never going to "Rickcr53 but that is for another time Rickeraptor out

Thanks again guys.Damn cool to hear from some of the old crew (emphasis on OLD ) and yes i do pop in from time to time but to be honest this is not exactly a "casual browse and post" joint so either I have to haunt the joint again or there being too much to digest in a short visit just browse...

Happy Birthday rickcr42! thanks John.Good to hear from you man Or should we say rickcr52? Frikkin' wise guy eh ! Whoob whoob WhoobWhoobWhoob...Nyuck...Nyuck Gotta say though I kinda like the way "Rick42" sounds though.52 just isn't doing it for the Rickster since as many know I AM a...

Quote: Hah, you beat me too it. Wasn't easy either.Realising through my superior deductive powers you were about to make my point i pounded that out so fast and with such authority my friggin' fingers are bloody stumps If i had the time what I WOULD HAVE typed was "Unity Gain...

lalalalalalaaaaa......double post sent bye bye

IMPEDANCE CONVERTER It does not have to have a high current output to be consider a "buffer" but rather is an interface to match a certain thing to whatever it is that is connected to the output. Do a google on "voltage follower" for a boatload of content Rickmeister

Quote: Hey long time no see, glad you're back... Remember, you never escape Head-Fi! sure you do ! ooops.........

Promising part that I ordered up a couple to test in mic/phono preamp/general gain stage use (came Friday,no time for any testing yet). The data sheet has extensive plots and graphs so gives a real indication on what to expect in peformance though sonics is a question better left to some actual...

one of the clearest and least confusing selector switch schemas there is http://www.goldpt.com/schm_pls.html If you break down a two pole rotary switch into a single channel at a time the concept is easier to grasp being no more than a main contact pointing to one of "X" input signal...

Electroswitch C4 Series Sealed contacts,silver plated,built like a brick crap house,has some real "BEEF" so will add mass to a small switch box preventing it from being overpowered by the cables connected to the back causing it to tip up in the front or worse and finally way cheaper than the...

http://www.avahifi.com/root/audio_ba.../ab1993-07.pdf

Quote: There is such a thing as going overboard. Sure, you should never use crap parts, but switching to a better topology or design is always preferable to mindlessly swapping in more expensive components I don't see where the "CMOY" is a lacking topology by any stretch being a...

Quote: For a CMoy, don't bother with premium resistors. ridiculous statement.ALL parts add to the sonic signature of an amp and if you use crap parts you will invariably have a crap sounding amp so why would you bother even doing the build if you are aiming for a low point right out...

neither of those will drive a low impedance headphone without either adding a step down transformer which will give you negative gain or by adding a solid state device making the tube redundant since the solid state device can be used without the tube. second is the parallel triodes thing.You...

how about micropower ? http://www.maxim-ic.com/appnotes.cfm/an_pk/3354 Toss a TI REG1117F-3.3 on the USNB power line,floow it with a shunt reg for a constant impedance that does not vary under a dynamic load,done.....

Quote: As for running from USB 5V, the best solution is probably the most obvious, to use a switching voltage boost circuit and then significant LC filtration to clean it up. Maybe obvious but that "significant" filtratration will be A-costly and take up a lot of board space...

4AA batteries in the BitHead so regulating down to the 3.3 VDC of the USB DAC chip a cakewalk leaving the headphone amp powering method the question.Is it A-one of the new generation of single supply CMOS Op-amps B-A dedicated "HEADPHONE AMP" chip that are cropping up from Maxim,National,TI...

Quote: Thanks every1 for the help, apparently bad/complicated idea. not a bad idea at all,a good thread. Complicated ? Can be if you are trying to get beyong just powering the device from the buss to creating something that sounds as good as a non USB-buss powered amp. You can...