Originally posted by BadVlad I'm not sure I follow which part you are plugging into the next part.... But regardless, the short answer is the IR transmitter in your post won't work with the Triggertrap Mobile App.
The Triggertrap Mobile app (iOS or Android) is outputting an audio signal
specific to the Triggertrap dongle. The audio signal created by the Triggertrap Mobil app is highly unlikely to be the same signal needed by the IR port on your camera. So you can't just plug the IR transmitter into your mobile device; you still need the dongle.
And the Triggertrap dongle is converting the audio signal into a simple on/off switch. So you can't just add the IR transmitter to the dongle (besides, they also both have 2.5mm MALE connectors). This means you still need a Pentax compatible IR remote which you will modify so the dongle's on/off switch will trigger the IR remote's on/off switch.
Pay a friend who knows how to use a soldering iron to modify a remote for you. With the plans in hand, the modification will take less than an hour. I think it took me less than a half-hour to do my last modified remote.