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.
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- |
RAT CAT Snake | Radial Catapult | Whirlwind Catdusa
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.
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.
The boards used for this project are shared at OSHPARK and can be ordered there.
| 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 | - |
| 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 | - |
