I'll most likely be using my PS2 with an R1, so I'll need to wire it for
1/8" unbalanced out. Here is how I'm thinking it's done, please correct
me if I'm wrong.

Pin 2 of Mic 1 = Tip (Left +)
Pin 2 of Mic 2 = Ring (Right +)
Pins 1 & 3 of both Mics = Sleeve (Ground? Negative?)

The obvious concern is that this circuit will introduce ground noise
into the sleeve from pin 1. But if I leave pin 1 out there is no ground
at all.

I'd really rather not mess with an isolation transformer. Not only is it
a hassle, I'm afraid it would affect the frequency response especially
in the low-end. I know SP sells a PS2 w/ 1/8" out. Anyone know how they
do it? Thanks a ton!!

ps: This was also posted to RAMPS and OADE.com.

Jonny Durango

What's a PS2 microphone? The only thing I know of that's called a PS2
is the Playstation 2. I googled SP and PS2 but could only come up with
Playstation hits.

You really only have two options when wiring any balanced device to
unbalanced: you either short the cold to ground or let the cold float.
The choice of which method to use depends on the likes and dislikes of
the gear you are interfacing.

We use a lot of EV635A mics upstairs hooked up to video cameras with
unbalanced inputs. We've been shorting the cold to ground in all of our
cables. So I'd try that first (which is the method you've described
below). If you want to get experimental, you can try having pin 3 float
(connect it to nothing).

I don't think ground noise is really the issue you have to worry about
when interfacing a mic to an unbalanced input. I think you the main
thing is that you're losing your common-mode noise rejection. Also, you
should make sure your unbalanced cable is shielded as well as possible
so that as much noise as possible *is* shorted to ground. Try to get
some double braided cable, although good luck stuffing that into a 1/8"
connector....

Cheers,
Trevor de Clercq

Jonny Durango wrote:
I'll most likely be using my PS2 with an R1, so I'll need to wire it for
1/8" unbalanced out. Here is how I'm thinking it's done, please correct
me if I'm wrong.

Pin 2 of Mic 1 = Tip (Left +)
Pin 2 of Mic 2 = Ring (Right +)
Pins 1 & 3 of both Mics = Sleeve (Ground? Negative?)

The obvious concern is that this circuit will introduce ground noise
into the sleeve from pin 1. But if I leave pin 1 out there is no ground
at all.

I'd really rather not mess with an isolation transformer. Not only is it
a hassle, I'm afraid it would affect the frequency response especially
in the low-end. I know SP sells a PS2 w/ 1/8" out. Anyone know how they
do it? Thanks a ton!!

ps: This was also posted to RAMPS and OADE.com.

Jonny Durango

"Jonny Durango" wrote ...
I'll most likely be using my PS2 with an R1, so I'll need to
wire it for 1/8" unbalanced out.

Dunno what a "PS2" or an "R1" is without more context, but
perhaps this might be useful?....
http://www.rcrowley.com/CamAdapt.htm

Trevor de Clercq wrote:
What's a PS2 microphone? The only thing I know of that's called a PS2
is the Playstation 2. I googled SP and PS2 but could only come up with
Playstation hits.

I was thinking it was an IBM PS2, which should indeed have a 1/8" output
jack. And yes, floating the ground on such a thing is a good idea, but
it shouldn't go into a mike input.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

In article 1113915621.cacf9e82a317bfa9d9ebc0f4d9d19a15@teran ews,
Trevor de Clercq wrote:


What's a PS2 microphone?

Denecke PS2 phantom power widget, a common enough item among concert
tapers.

In article ,
Richard Crowley wrote:


"Jonny Durango" wrote ...
I'll most likely be using my PS2 with an R1, so I'll need to

PS2 = Denecke PS2 (a battery powered dual phantom box)
R1 = Edirol R-1 (a quite nice 24-bit portable Compact-Flash recorder)

This combination ought to make for a great portable rig.

Sorry, this post was original written for
rec.arts.movies.production.sound and the OADE.com taper's forum, both of
which have members who are very familiar with these products. The
Denecke PS2 is a great little 2 channel 48v phantom power supply that
runs off 9v battery. The Edirol R1 is a 24-bit stereo CF recorder.

http://www.soundprofessionals.com/cg...m=DEN-PS2-MINI
(this is the way I want to wire my PS2, which currently has two male
XLR's hanging off of it)
http://www.edirol.com/products/info/r1.html

Sorry for the confusion.

Jonny Durango