This is a great, simple project to make a small and robust 9V IR detector. It can be used to seek out security cameras that use infrared light to "see" or to check if your remote control is still working.
Step 1: What you need
For this project you will 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.