It’s an electromagnet pendulum analog circuit. Whether you’re building it, or just studying the schematics, this is a fun way to brush up on the non-digital side of the craft. The pendulum is ...

For more, watch [Josh] describe his method in person after the break, or try flashing his code to an Arduino and make a waving cat of your own.

Curious about electromagnet shields? In just 60 seconds, discover how they work and the science behind their protective power. Learn the secrets of this fascinating technology! USPS Announces ...