CCTV Rocks!

I have a great Sony SSC-DC10 camera that must have 12VDC. I want to mount it on my 24VAC Pelco PS7-24 Pan Motor. I built a circuit that this great website recommended and am experiencing thermal shutdown from the 7812. It seems that 24VAC into this circuit is excessive. I hooked up 12VAC into the same circuit and it works fine. Of course this defeats the whole purpose as I only have 24VAC at the pan unit. Current draw of the working circuit is around a quarter amp so the 7812 should cruise along if I can figure out how to not overdrive it with too many volts. There is a little extra room in the enclosure to fit extra stuff that you fellows may recommend. I perf boarded the the first attempt. Thanks for helping.

Where do I begin? This is without a doubt the most knowledgeable, friendly, and quick to help group of people I have ever had the pleasure of replying to! May I reply to you all below? NotoriousBRK: I apologize for not being clearer on the schematic that this site provided. It was very close to the schematic that “Soundy” provided for us to review. ak357: I had a bunch of 7812’s lying around from my days of video game / pinball repair so I thought it may work. Horizon: I will look into your suggestions – I thought this little bitty camera would not be a current gobbler – I also suspect the lens is adding its own load. Soundy: I think you posted a reply to another newbie that illustrated the schematic I followed. That schematic only showed ½ wave rectification, but I went ahead and went full wave (I have all these parts laying around just wanting to do something interesting!) Photo attached at my prototype and a photo of the great camera that Sony made. Hope the photos show up - I may not be uploading correcting. BTW; Mr. Sony has survived all my power supply “tests”!! I will follow all the great advice you experts have provided and promise to provide an update on the final solution.