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TS or TRS for 3.5mm to XLR


stacysound

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I've built cables for years and suddenly find myself doubting this simple cable.

 

I’m going to built a cable for scratch audio Comtek/R1a  hop to camera - 3.5mm to male XLR. I might use Comtek, or R1a. A Tip Sleeve would be preferred over a Tip Ring Sleeve because of the Comtek, yea?

 

3.5mm Tip to XLR Pin 2

3.5mm Sleeve to XLR Pin 1

Float pin 3 or ground it?

 

TIA

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Hi, Stacy

 

At least for a Comtek I would wire it:

 

TRS 3.5mm plug:

Tip = XLR Pin-2

Ring = XLR Pin-3

Sleeve = XLR Pin-1 (In the XLR, ground Pin-1 to PIn-3)

 

TS 3.5mm plug:

Tip = XLR Pin-2

Sleeve = XLR Pin-1 & Pin-3)

 

On the Comteks, Tip and Ring are the same mono signal but out of phase to each other. 

By grounding the ring you diminish the chance of out of phase cross-talk.

 

On the camera side, whether pin-3 has to be grounded depends upon the input topography, however, grounding it should work whatever the input design.

 

According to the R1A manual: 

 

"Mono Plug/Stereo Plug Usage

A Mono plug or a Stereo plug can be used with the IFBR1a headphone jack directly. When a Mono plug is in- serted, a special circuit senses the “ring” to “sleeve” short and automatically switches off the ring to prevent excess battery drain. To reset, switch power OFF then back ON. "

 

So the above wiring should work fine there, too.

 

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