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Subject: Two-layer or 4 layer? / Ground plane?

Date: 05/15/03 at 11:18 AM
Posted by: Jeffrey Myint
E-mail: jeffm@cadcom.com
Message Posted:

My company has been using a two sided board for analog telephony. Talk paths from a Music Telecom MPT16 provide analog voice from one end of the board while a headset with mic provide analog voice into the other end of the PCB board.

The PCB board consists of 16 talk paths that are electrically as shown below

pwr supply
- 48v +
| |
| 270 ohms 22uf 270 ohms |
Head MTP16
Set (600 ohm)
| |

Problem: This design has a huge amount of crosstalk. Conversations can be heard and held between the different circuits.

I am not an analog hardware or PCB designer. I'm just the manager who needs to come up with a coss-talk free solution. Do we need ground planes ? Shielding? A different ciruit design?

Any suggestions would be welcomed.

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