Carlsbad-based Linear LLC, a major supplier of wireless home security systems, held an open house June 22 to celebrate its expansive new headquarters at 1950 Camino Vida Roble. Tim Farrell founded Linear in 1961 with William Schanbacher as a retail operation selling automatic garage door openers. But the company has expanded significantly to include manufacturing wireless radio frequency controls. In addition to home security systems, Linear supplies intercoms, garage door operators, gate operators, short- and long-range radio remote controls, and medical/ emergency reporting systems.