> -----Original Message-----
> From: Adam Schlag [mailto:email@example.com]
> I'd like to build the simple IR transmitter circuit shown on the LIRC
> web site, but I really don't know where to start. I've never done
> anything remotely like this before, so any help anyone can
> give would be
> appreciated. I know some (if not all) of the pieces can be
> gotten from
> a store like radio shack, but what then?
Just put it all together and try it until it works... what else? The schematics are on LIRCs web site.
If you dont feel comfortable doing it, ask a friend or buy commercial. Although "home-brew" design works, Id recommend UIRT much better design, has functionality to power-up PC using Wake-On-Lan header on motherboard and less CPU intensive.
> Yeah, it would be easier to buy a ready made transmitter, but I need
> this for a home theater set up I'm building and there aren't any
> commercial transmitters (that I'm aware of) that can control a Dish
> Network receiver.
I'm facing same problem as you are but after some research I decided to get USB-UIRT made by Jon Rhees, from my point of view the price is stiff but it works and designed very well. I did not have chance to try it but people reported that they got it to work with Linux LIRC and it works great on Windows with Girder. For less, you can try getting MyBlaster, it should work with dishnet but I'm not sure, so research before buying. I recommend to stay away from everything else, if you do decide to get something else be sure that it will do what you want it to do.
Also keep in mind, the reason many transmitters dont work because there is no standard way to reproduce IR signals, and you have to learn those using IR receiver. Most IR receivers designed to pick-up 36k frequency and dishnetwork remotes work on 58k frequency thus if you'll have 36k IR sensor in your IR receiver, you wont be able to learn dishnetwork remote codes. Although LIRC has extensive database of IR codes, those codes wont work for every setup because of PC speed, IR transmitter design differences and timing issues, and I think thats one of the main reasons why UIRT project was born. UIRT does not use PC CPU power to learn/send IR codes, it uses its own micro-controller thus eliminating all timing issues.