I have this strange problem with a RFID Scanner module that I connect to my PIC.

If I connect the RFID Module directly to a 9volt battery and a 7805, it is working fine.

On the RF Reader module I have a LED Witch goes on and off when I scan a RFID.

When I connect the RF Reader Module to PORTA.3 of my PIC through a transistor (To make the current a bit more), the Module's LED Just starts flickering?

Any ideas what the problem could be?