I made a USB remote reciever for my PC and the reciever chip I have used is TSOP 1738... Its a 38KHz IR reciever.. It works fine with all ordinary remotes but I wish to make my own remote.. could somebody help me design a 38KHz IR transmitter circuit using simple components.. NEC or philips coding is not necessary as the reciever can catch any signal in the 38KHz range.. It should have 5 or 6 buttons which can be made possibly thru resistors I hope.. Any help please??