hey guys i am stuck with some transformer problem here.Actually i dont really have much knowledge about transformers except that they step up or step down voltages.I've been busy with this simple laser communicator project (i hope everyone knows about it).In that there is mentioned a transformer with this information "one 1000 ohm coil and the other 8 ohm coil".Can any body help explain this to me?.And above all whats the use of transformer here anyway?.I've included the transmitter part of the laser communicator as a help.thanks