Real circuit-bending stuff.
We worked with Lightsaber toys. These are battery-powered, simple electronic items. We opened up the plastic chassis and removed all the different components. We applied the knowledge and formulas we learned into assesing the model. There was a circuit board, LED, 2 lithium batteries, the chassis, a bulb/holder, and a speaker. The photo shows how we attached a potentiometer and applied resistance to the current running through the speaker and the LED.
See also- My Zombie Battery Post.