I have several 9vdc powered items that are used for scaring deer out of my yard. The device is motion activated and opens a solenoid that allows a sprinkler head to send a 4 second burst out. These work well, but if the battery runs down, the deer win. I would like to use low voltage ac (as in yard landscape lighting) to power these units. I think those transformers operate at 12-14 vac and up to 300watts. Do not know that amperage requirement for my deer device but it can't be much. What I want to do is to "convert the devices" to run on 12 vac. I also have a similar device that runs on 2 D cell batteries (3vdc) and one that runs on a single 9vdc battery. Would like all to be powered by a single landscape lighting transformer. Can anyone help?