12V AC adapter to 5V

Hi, I am building my own digital photo frame. I am using a Haier 7" LCD TV for the screen, which requires a 12V input, and the SanDisk Digital Photo Viewer (SDV2-A-A30), which requires only 5V of power. I understand I could possibly use a 5V regulator, but I don't know where to insert that into the circuit, or if I would possibly need a diode or heatsink or anything for it.

Essentially, I'm connecting the digital photo viewer to the 7" LCD screen, but I only want to use one AC power adapter for both parts. All suggestions are welcome. Thanks!

Use a 7805 linear voltage regulator. Whether you need a heatsink or not is dependent on the current draw of the SanDisk Digital Photo Viewer. Post that spec and someone will let you know.

Provided your AC adapter has a DC output you don't need any diodes.