[sdiy] Request brain dump on balanced lines

[Jay Schwichtenberg]

Grant,

You're over complicating the issue.

There are two types of XLR pin outs and I can't remember either. I usually
go to Rane's WEB site and check out their app notes and docs. They will tell
you what +, - and ground are on the connector. I highly recommend the Rane
site for info on general audio information.

Providing these are not mic inputs the impedance should not be a problem.
For TSR it's Tip +, Sleeve ground and Ring -. Hook the tip up to the +-5
signal, sleeve and ring to ground. So basically you are running differential
pair with one end grounded. With the ring at 0 your differential signal
becomes the plus side summed with 0. Here is the only issue. Some
differential front ends compensate for this and others do not. With the
compensated inputs you will get a signal of +-5 out, unity gain. With
non-compensated inputs you will get 1/2 what you put in out. The trim pots
for the mixer should be able to trim the input to something useful.

Jay

> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl
> [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Grant Richter
> Sent: Friday, October 11, 2002 1:10 PM
> To: Scott Stites; synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] Request brain dump on balanced lines
>
>
> Can someone familiar with balanced mixing console lines summarize the
> information?
>
> What I need to know is typical voltage levels and impedance's for
> TRS jacks
> and XLR connectors.
>
> I'm trying to figure out a nice (i.e. cheap) way to interface +/- 5 volt
> single ended synth signals to your typical mixing console balanced inputs.
>
> Is a single ended to balanced transformer a good way to go, or is
> an active
> differential output better?
>
> I get asked about this all the time and don't really have a good answer.
>
> Thank you for any information or help.
>
>