38khz IR remote circuit

Thread Starter


Joined Jan 8, 2009
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??


Joined Oct 14, 2005
You still need to modulate the IR beam with 38kHz signal, and then encode the buttons. Start with an encoding scheme (3 bits should suffice for less than 8 buttons) and don't forget to include the initial preamble burst to synch and set the receiver AGC.

If you lok at it, you'd still need a microcontroller to do all these task. And a simple transistor switch to drive the IR transmitter.