On my IR remote repeater, I have 6 LED driver outputs, so far I have 
replaced 2, could have been accidental shorting during testing, or 
ESD??  Each output starts at a PIC 18F4320 port B pin. This goes to a 
ZTX603 NPN Darlington Transistor, with the PIC pin > 2.2K resistor > 
Transistor Base. The Transistor emitter is to ground, and the transistor 
collector > 10 ohm resistor > on board RJ-45 > Cat-5 cable > 3.5mm mono 
audio connector to the IR LED(S). The return is to 5 VDC copper area on 
board.

I am thinking of adding zener ESD protection, but need help. Have tried 
Googling, but just didn't hit the right info. Some advice would be 
appreciated:

The boards (3) are built, but there are large copper areas for ground 
and +5VDC near that would make adding components not difficult. I have 
stock of 1n4733A (5.1V, 1W), 1n4739A (9.1V, 1W), and 1N4148 (75V, 150MA) 
diodes in sufficient quantity.
1: Would any of these parts be usable? But it wouldn't be an issue to 
order better suited pieces.
2: How to connect? Ground?  +5VDC?  Anode/cathode.

Thanks again.
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