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.

THE electromagnet designed for the use of oculists by Dr. Haab, director of the Zurich eye clinic, and shown in the accompanying photographs, is the most powerful and efficient apparatus of this ...

Now imagine a circle of electromagnets that you could turn on and off one after another. Using this device, you could make the nail move in a circular pattern.) ...

Remember - these variables are controlled (or kept the same) because to make it a fair test ... the magnetic field and hence the stronger the electromagnet. Hazard Consequence Control measures ...

Electromagnets have some advantages over permanent magnets. For example: they can be turned on and off the strength of the magnetic field can be varied These properties make electromagnets useful ...