[mythtv] OT: Question about IR Blaster Circuit

Matthew Burnham mythtv-dev@snowman.net
Tue, 31 Dec 2002 00:22:05 -0000

Pin 5 is ground, but the other pins are at either +12V or -12V. Thus,
pin 5 can be used to source or sink depending on what the other end is.

> I've got a question about building the IR circuits.
> I am no electronics wizz, so I showed the circuit layouts to 
> my friend.  I showed him the IR receiver from 
> http://www.lirc.org/images/schematics.gif
> and the IR 
> transmitter from http://www.blars.org/blarslirc/.  He noticed 
> that the receive diagram uses pin 5 for ground, but the 
> transmit diagram seems to use pin 5 for power (?).  Again, I 
> couldn't solder my way out of a paper bag, so I was wondering 
> if anyone can make sense out of the two diagrams.
> If the pin-outs for the transmit circuit are incorrect, what 
> _should_ they be?