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

Thread Starter

MyNameIs

Joined Mar 9, 2014
1
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): http://forum.allaboutcircuits.com/showthread.php?t=3483 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: http://circuit-diagram.hqew.net/Wireless-infrared-headphone-transmitter_18562.html 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
 

AnalogKid

Joined Aug 1, 2013
10,990
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:

http://www.nolanlem.com/online_portfolio/images/FM_transmitter_detector.pdf

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?

ak
 
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