From a build it day at the San Antonio Hacker Space
1 NPN transistor
1 resistor 390 ohms
Bare Paint Eelectrically Conductive Paint
Wire about 3 feet
9v battery connector
Printed Image or Sticker
Clear Tape or Glue
Step 1: Step 001 - Tape Image or Stick Sticker on Front of Box
Tape Image or stick sticker on front of Box
Step 2: Step 002 - Cut a Hole in the Box
Make sure the hole is a bit bigger then what you need. We will be putting a smaller cut out of paper in the next step.
Step 3: Step 003 - Cut a Rectangle Smaller Then the Previous Step and Paint Will Conductive Paint
Paint around the Opening
Paint a line away from the Opening that will be used connect a wire to.
Step 4: Step 004 - Attach the Wire to the Conductive Paint
Tape the Wire down.
Step 5: Step 005 - Tape the Paper to the Box
Step 6: Step 006 - Cut Out a Little Box From the Paper.
Step 7: Step 007 - Tape the Box Inside the Larger Box
Step 8: Step 008 - Adding the Electronics
I used the Eyes and the Mouth of the Instructables Robot.
Note Make sure to place the positive side of the LED next to the emitter of the Transistor.
Step 9: Step 009 - Soldier the Components
Solder Positive Battery Connector Wire to NPN Collector
Solder LED Positive to NPN Emmitter
Solder NPN Emmiter to Resistor
Solder Resistor to the Negative Battery Connector
Solder Long Wire to NPN Base
Step 10: Step 010 - Attach Long Wire to Metal Tweezers
Tape wire to the metal tweezers
Step 11: Step 010 - Attach Battery and Place Nut or Small Object in the Hole
Close the box
Put nut in hole
Play your DIY Operation Game by trying to grab the object with the tweezers without lighting up the led.