38khz IR remote circuit

Discussion in 'The Projects Forum' started by jj_alukkas, Jul 7, 2009.

  1. jj_alukkas

    Thread Starter Well-Known Member

    Jan 8, 2009
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    5
    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??
     
  2. n9352527

    AAC Fanatic!

    Oct 14, 2005
    1,198
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    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.
     
  3. bertus

    Administrator

    Apr 5, 2008
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  4. jj_alukkas

    Thread Starter Well-Known Member

    Jan 8, 2009
    751
    5
    If it was to use a uC, i guess its better to rip an old remote off its chip and make a new one...

    could i use this diagram and modify it??
    [​IMG]
    Originated from http://jap.hu/electronic/infrared.html

    Or this one modified??
    [​IMG]
     
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