websites for digital circuits

There's a fine line between art and tech. Find out what artists are using to create phenomenal modern pieces.

Tracking an infrared light source is not as difficult as you might think; a 14-pin PICAXE, a stepper motor with a driver IC, three phototransistors, and a few other components will do the trick.

How do you design a filter that (ideally) has the same gain for all frequencies? And, furthermore, why would you want to do this?