[mythtv-users] IR Transmitter

[Brian Stults]

Dan Morphis wrote:
> To build the simple circuit, you'll need a few parts:
> 
> 1 x 1N4148 diode
> 1 x 3k ohm
> 1 x IR LED (Can be scavanged from an old remote, or you can use LD 271)
> 1 x Soldier style db9 male
> 
> Soldier a wire on to pin 4 of the db9 header.  Take the other end and 
> soldier it to the anode (The end W/O the black line) on the diode.  Take 
> the other end of the diode and soldier it to one end of the resister.  
> Take the other end of the resister and soldier it to anode of the ir led 
> (The side w/o the flat spot [someone please correct me if I have that 
> backwards]).  Take the other end of the ir led and soldier it to pin 5 
> of the db9 male connector.
> 
> You should be looking at less than $5 in parts.  If you want a quick way 
> to test the circuit, fire up the camcorder and look through the view 
> finder while lirc is sending a signal.  A quick way to send the signal 
> is: irsend SEND_START <REMOTE_NAME> 1
> 

I also had absolutely no knowledge of electronics and I also have the SA 
2100.  I did exactly what Dan describes above and was able to make it 
work pretty painlessly.

Another way to test it is to temporarily replace the IR LED with a 
regular LED.  I took one from an old ethernet card.  If everything is 
put together correctly, it will light up when you execute the "irsend" 
command shown above.  Also, if you want to try it first without 
soldering, you can use a small piece of "breadboard".  You should be 
able to find that at Radio Shack (or any other similar store).