All of the above suggestions will work under some load condition, of which we know nothing, 'might be a single LED & 150 ohm resistor drawing a whopping 20 mA. I'll hold my $.02 'till we hear from Threader.

 

The attached isn't fancy, but should do the trick.

The 11DQ03 diodes are Schottky diodes rated for 1.1A, 30v. You could use 1N5817 Schottky diodes instead. Schottky diodes have a much lower forward voltage than standard diodes, which is important in your application. The downside is that they will be destroyed much more quickly than standard silicon diodes if they receive high reverse voltages.

The Zener provides regulation. R1 supplies current to the Zener. Q1 follows the voltage across the Zener, and it's emitter is about 0.7v lower than the Zener voltage, depending upon the load. At 100mA load, there will be about 50mV ripple with C1 being 2200uF, which is less than 1%. Don't go much smaller, or you'll wind up with lots of ripple.

Hey i looked at your PDF, I know nothing at all about circuits, I'm just using it for a class. But I need a picture of what the actual circuit board would look like so i can put it into a 3D Cad model program. Can you explain how the board would look, or have any pictures of something that would look similiar? Thanks alot!

 

Hey i looked at your PDF, I know nothing at all about circuits, I'm just using it for a class. But I need a picture of what the actual circuit board would look like so i can put it into a 3D Cad model program. Can you explain how the board would look, or have any pictures of something that would look similiar? Thanks alot!

Sorry, I just created that schematic in a schematic capture/PSPICE simulation program. I didn't actually build it.

You could go on various vendor websites, like Digikey.com, Mouser.com, Newark.com - and perform searches for things like 120v to 6v transformers, diodes, resistors, transistors, etc - frequently, they will have images of what the actual components look like.

I've used a freeware package called POV-ray as an add-on to Cadsoft Eagle board layout/schematic capture to create 3-D projection views of a circuit board, but that's not the same as creating one in a 3D CAD program from scratch.

 

Well the 3D Projections you are referring to would be perfect. Could you send me those some how? Also if i wanted the output of the circuit to be a USB fitting, how could I do that? I don't actually have to do it, it's just for a project. Thanks

 

Since this is for a homework assignment, I can't do it for you.

However, if you want the tools to do it yourself, here are some links that will be of help:
1) Cadsoft USA - you can download a freeware version of Cadsoft Eagle, a schematic capture and board layout program. Link: http://www.cadsoftusa.com/

There are tutorials on the use of Eagle on the CadsoftUSA website. There is a simple tutorial on Sparkfun, here: http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=108

POV Ray: is freeware, you can download it from this site: http://www.povray.org/
Here is the POV Ray Utility page: http://www.povray.org/resources/links/3D_Programs/Conversion_Utilities/
You'll need the Eagle 3D utility.

You can define new components to add to the library. Documentation and examples are provided.