IR audio transmitter and receiver, does anyone know the source of this schematic?

Discussion in 'The Projects Forum' started by MyNameIs, Mar 9, 2014.

  1. MyNameIs

    Thread Starter New Member

    Mar 9, 2014
    Hello all,

    I am about to start the project stated in the title, and while searching through the forums on here I found this post by mrmeval (3rd from top): However, that forum is old and I cannot reply to it. The schematic looks sound, but I cannot locate the source. The closest I've come has been on the following page: but that still does not lead me anywhere. Does anyone know where this is from? Additionally, has anyone built this circuit? If so, was it operational?

    Many thanks
  2. AnalogKid

    Distinguished Member

    Aug 1, 2013
    That circuit is from a very old app note that didn't make it through when RCA's IC business went to Harris, then Intersil, then TI. An updated circuit is here:

    Note that in the text the first op amp in the receiver is an LM318, not a 741. This is correct, and the BOM is wrong.

    But the thread you referenced asks a good question. Why not buy some infrared headphones?