Update December 6, 2012
I am in the process of remaking the sonic with plumbing parts and attiny85's. The version I have developed uses 2 AAA batteries for power and should theoretically be louder. It also includes the TV-b-gone clone circuit. I am stuck in a coding problem to do with timers but hopefully soon I will have a new set of instructions. I am posting a process image above.
UPDATE! I have found a simple solution to a problem that I have been contacted about several times regarding the sound circuit. The trick is to remove all the wires but the two for power from the programmer before testing the device out.
I have two people who I am very close to who enjoy the show Dr. Who. For both of them I have made sonic screwdrivers to accompany their (mild) obsession. Both of the sonic screwdrivers make the proper sound and light up using a UV light however the more complicated one also turns TV's on and off, has an mp3 player embedded in it, uses a rechargeable battery, has a laser, has an FM transmitter and also shakes when activated. This instructable covers the construction of the simplified model to get a basic understanding however I include at the end a section on how I added features to the more complicated version as well as ideas for additional features I considered adding.
Attached to this step is a video of my first sonic screwdriver turning on a tv. The buzzing sound that is heard that should not be there is due to the vibration motor coming slightly loose. It is only noticeable within a few inches of the handle, past that the proper sound is heard loud and clear.
I do not like my props to feel cheap or breakable so both versions were made with metal handles and feature glass marbles as the light end. The amount of plastic exposed to the exterior of the sonic screwdriver was kept to a minimum so it appears as if it is a tool worthy of traveling the stars, opening doors, making cabinets and general tom foolery.