- I am working on a project for school and would like some inputs on my
idea. I plan on makeing a radio controlled pet door.My first try was
using a A.M. Tx 555 sendind a signal to the audio transformer which
did not work out. I have a superhet Rx going to a relay which will
open the door and a reversel circuit for closeing the door. My biggest
thing is trying to figure out what whould be the best circuit for the
Tx, it would be nice to stick with AM as I have a Rx working. Open
to any ideas.