cliveb;519452 Wrote: > Unlike Phil, I *am* convinced that properly balanced connections are > worthwhile, even for short runs. I believe it has little to do with the > common mode noise rejection, and more to do with isolation of grounds. > > > The Analog Devices SSM2142 is a bit long in the tooth and can be > difficult to source. The TI Burr Brown DRV134 is a pin-compatible > alternative. > > That said, building a balanced driver with active components like this > can be tricky to get right. It's all too easy to introduce a bit of > unwanted noise (in the form of hiss). I've built line drivers with both > SSM2142s and DRV134s, and I have never been entirely happy with the > noise floor. Transformers are easier to use (albeit significantly more > expensive, and they never have ruler flat response). If you're ace at > PCB layout, then using the active chips is the obvious way to go, but I > think for the hobbyist it's swings and roundabouts.
Agree with the chip thing - it was just an example. As for isolation of grounds - this isn't necessarily a given with a balanced connection. Hence the need for ground lift switches in some equipment. I've had a lot of fun with balanced connections - I had over 180 of them in my studio. I especially enjoyed the moment when I discovered one of my racks was floating at 100v over earth! Ground isolation involves the PCB design and case earthing arrangements at both ends too... -- Phil Leigh You want to see the signal path BEFORE it gets onto a CD/vinyl...it ain't what you'd call minimal... SB Touch Beta (wired) - TACT 2.2X (Linear PSU) + Good Vibrations S/W - MF Triplethreat(Audiocom full mods) - Linn 5103 - Aktiv 5.1 system (6x LK140's, ESPEK/TRIKAN/KATAN/SEIZMIK 10.5), Townsend Supertweeters, Blue Jeans Digital,Kimber Speaker & Chord Interconnect cables Kitchen Boom, Outdoors: SB Radio ------------------------------------------------------------------------ Phil Leigh's Profile: http://forums.slimdevices.com/member.php?userid=85 View this thread: http://forums.slimdevices.com/showthread.php?t=74715 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
