Application Notes - Using the Dongle Emitter Jack

If you're using either a Tira2 or UIRT dongle, you've probably noticed the jack on it. This jack allows you to plug in an IR emitter to expand the IR output coverage of the dongle. In this case, just stick the emitter to the face of the component or place the emitter where it can "see" multiple components (inside a cabinet for instance).

If you're using an IR distribution system to control a complex home theatre setup then you may be able to drive that IR system directly from a Tira2 or UIRT dongle using an adapter. This approach has the advantage that you don't need to place the dongle in view of an IR pickup. Most IR distribution systems will allow more than one pickup input so the dongle does not replace the IR pickup, which you still need for your remote controls.

The following adapter circuit has been tested with a Xantech IR distribution system. The circuit uses a 4N35 to isolate the dongle and IR system from each other. The diode is the key to the adapter working with other IR pickups installed in the distribution system. Any small signal diode should work. Resister values are in ohms. 

The V, G, and S output pins should be connected to the matching screw terminals on the Xantech emitter block.