Step 1: What you need
-A 9V battery clip with a flat cover made of plastic
-A 9V battery
-LED (any color although it should be clear in order to see it better)
-330 ohm resistor (orange-orange-brown-gold or silver)
-perf board (see 2nd picture)
-double sided mounting tape
-dremel or hack saw to cut perf board
-clear epoxy-like glue
-solder with flux core
A shematic is given in step 12, picture #4.
Step 2: Assembly Part 1
Step 4: Assembly Part 3
Step 5: Soldering
If you're a first-time solderer, you should watch this video: http://www.youtube.com/watch?v=I_NU2ruzyc4 .
(I didn't make the video, thanks go to CuriousInventor)
After soldering, your project should look like the example in the first picture.
Then, clip off the excess component leads, making sure not to break the solder joints.
Step 6: A bit more soldering
For the bridge you can take a snipped off lead from one of the components. I first bent my lead to put it through
the holefor stabilisation like in picture 2, but you don't have to. The result is all that counts.