Imported from GitHub: karlcswanson/CatPatch · commit ffd575c · license MIT

Description

PCB Designs for a subsnake system

README

CatPatch

This repository contains images and KiCad files for a CAT5e subsnake and DI system.

A brief build log for the DI and breakout cable can be found here.

Pinouts

The system, as labeled, is pin-compatible with RAT and ETS audio twisted pair products. The silkscreen and wiring can be adjusted to make it compatible with other standards.

RJ45 Pin	T568B	RAT & ETS	Radial & Whirlwind
1	WO	2+	1+
2	O	2-	1-
3	WG	3+	2+
4	B	1-	3+
5	WB	1+	3-
6	G	3-	2-
7	WBr	4+	4+
8	Br	4-	4-

---

Sources

RAT CAT Snake | Radial Catapult | Whirlwind Catdusa

Cable

Shielded cable is needed when using phantom powered, Clear-Com, and DMX devices over twisted pair. These devices require pin 1/ground to work. An EtherCON connector does not indicate that a cable is shielded.

Dynamic mics and passive DIs may work without the recommended shield.

DI

The DI PCB supports the Jensen JT-DB-EPC transformer found in DIs like the Radial JDI. A more affordable transformer can be substituted and can be found in the BOM.

The simplest configuration of the board requires a transformer and 6k81Ω resistor. A stereo summing circuit can be added with a few resistors. See the schematic and the classic RaneNote for more details.

A drill template can be found in the docs folder.

Labels can be printed on standard ID cards and can be attached with 3M Command Strip adhesive.

Frequency Response

I just want the boards, how do I get boards?

The boards used for this project are shared at OSHPARK and can be ordered there.

BOM

Breakout Panel

Item	Manufacturer	Quantity	Price Each
CH1/10 1U rackmount chassis	Redco	1	$66.95
NE8FDV-B Vertical EtherCON	Neutrik	7	$4.17
NC3MXX-BAG Male XLR	Neutrik	28	$2.96
SBR Rubber Push-In Grommet 1-3/16" ID	-	1	$11.80/10
Neutrik Black Screw for etherCon	Neutrik	14	$.21
Neutrik DBA-BL D blank	Neutrik	1	$.73
Flat Head Screws	-	2	$6.49/50
Steel Locknut with Lock Washer	-	2	$8.72/100
N8FDV breakout PCB	Custom	7	-

DI Box

Item	Manufacturer	Quantity	Price Each
Steel Project Box Pre-Punched for 5 D Series XLRs	Pro Speaker Parts	1	$16.65
NE8FDV-B Vertical EtherCON	Neutrik	1	$4.17
NC3FD-L-1-BAG Panel mount D XLR	Neutirk	2	$3.22
NJ3FP6C-BAG Panel mount D TRS	Neutrik	2	$5.76
JT-DB-EPC Transformer	Jensen	1 - 2	$73.08
OR
Transformer for PROAV2 and PRODI	Radial	1 - 2	$36.00
Neutrik Black Screw for etherCon	Neutrik	2	$.21
Flat Head Screws	-	8	$6.49/50
Steel Locknut with Lock Washer	-	8	$8.72/100
Press-Fit Threaded Standoffs	-	4	$9.14/25
Button Head Hex Drive Screw	-	4	$11.00/100
N8FDV breakout PCB	Custom	1	-
DI breakout PCB	Custom	1	-

Project Images