[mythtv] Suggested IR Transmitter Circuit

Jeremy Oddo mythtv-dev@snowman.net
Fri Jan 3 20:42:05 EST 2003


Hey, thanks for the reply.  I was actually looking at that circuit.  It's
a lot like the one I (well, my friend) tried.  It doesn't need external
power, right?  I think I'll start off on a breadboard.  I'm a fool when it
comes to electronics so it'll probably take me a while to figure it all
out :(  As for the connector, I'm thinking that I'll probably get a
female-female RS-232 cable and cut one end off.

Wish me luck ;)

Thanks again for the insight...
Jeremy


> Hello Jeremy,
> 	I just built the "Enrique Vidal" circuit and it works beautifully.. i
> think
> that's the improved_transmitter one
>
> I'm using it from about 10 ft away.  I got most of my parts from radio
> shack.   The ir transmitter was from an old remote control (the
> component it was for  was broken anyway).  I got the resistors and the
> transistors from my work,  but those are all easily found at radio
> shack.  For the diodes (since the  circuit doesn't say what to use), I
> used all 1N4148 diodes- standard silicon  switching diodes.  Just double
> check which pins are emitter, collector and  base on your transistors
> before you start.. i wired mine backwards at first  and took an hour to
> realize it!
>   For the serial port connector, I just used one of those cables that go
> from
> the motherboard tothe rear of the pc and cut the connector that goes to
> the  board.... i can then use a regular serial cable as an extension to
> the  transmitter..  this saved me from having to solder to the ever so
> small pins  on the serial connector directly.
>
>
> On Friday 03 January 2003 02:44 pm, Jeremy Oddo wrote:
>> I've got a question for those people successfully using a homebrew IR
>> transmitter.  Which circuit are you using?  I've found four designs.
>> I don't need it to have great range (1 foot is fine).  I tried
>> building the "http://www.blars.org/blarslirc/" circuit but I must have
>> screwed it up alond the way because it's not working...my receiver is
>> working fine, tho.
>>
>> Any suggestions?  Here's the circuits I'm looking at:
>>
>> 1.  http://www.lirc.org/transmitters.html  (the first circuit)
>> 2.  http://www.lirc.org/transmitters.html  (the second circuit)
>> 3.  http://www.lirc.org/improved_transmitter.html
>> 4.  http://www.blars.org/blarslirc/
>>
>>
>> Thanks!
>> Jeremy
>>
>>
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